fix: Defer low-power mode during section indexing and book loading

Prevent the device from dropping to 10MHz CPU during first-time chapter
indexing, cover prerendering, and other CPU-intensive reader operations.

Three issues addressed:
- ActivityWithSubactivity now delegates preventAutoSleep() and
  skipLoopDelay() to the active subactivity, so EpubReaderActivity's
  signal is visible through the ReaderActivity wrapper
- Added post-loop() re-check of preventAutoSleep() in main.cpp to
  catch activity transitions that happen mid-loop
- EpubReaderActivity uses both !section and a loadingSection flag to
  cover the full duration from activity entry through section file
  creation; TxtReaderActivity uses !initialized similarly

Also syncs HalPowerManager.cpp log messages with upstream PR #852.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/EpdFont/builtinFonts/all.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#ifndef OMIT_BOOKERLY
 #include <builtinFonts/bookerly_12_bold.h>
 #include <builtinFonts/bookerly_12_bolditalic.h>
 #include <builtinFonts/bookerly_12_italic.h>
@@ -16,7 +17,10 @@
 #include <builtinFonts/bookerly_18_bolditalic.h>
 #include <builtinFonts/bookerly_18_italic.h>
 #include <builtinFonts/bookerly_18_regular.h>
+#endif  // OMIT_BOOKERLY
+
 #include <builtinFonts/notosans_8_regular.h>
+#ifndef OMIT_NOTOSANS
 #include <builtinFonts/notosans_12_bold.h>
 #include <builtinFonts/notosans_12_bolditalic.h>
 #include <builtinFonts/notosans_12_italic.h>
@@ -33,6 +37,9 @@
 #include <builtinFonts/notosans_18_bolditalic.h>
 #include <builtinFonts/notosans_18_italic.h>
 #include <builtinFonts/notosans_18_regular.h>
+#endif  // OMIT_NOTOSANS
+
+#ifndef OMIT_OPENDYSLEXIC
 #include <builtinFonts/opendyslexic_10_bold.h>
 #include <builtinFonts/opendyslexic_10_bolditalic.h>
 #include <builtinFonts/opendyslexic_10_italic.h>
@@ -49,6 +56,8 @@
 #include <builtinFonts/opendyslexic_8_bolditalic.h>
 #include <builtinFonts/opendyslexic_8_italic.h>
 #include <builtinFonts/opendyslexic_8_regular.h>
+#endif  // OMIT_OPENDYSLEXIC
+
 #include <builtinFonts/ubuntu_10_bold.h>
 #include <builtinFonts/ubuntu_10_regular.h>
 #include <builtinFonts/ubuntu_12_bold.h>

lib/Epub/Epub/Page.cpp

@@ -1,8 +1,17 @@
 #include "Page.h"
 
+#include <GfxRenderer.h>
 #include <Logging.h>
 #include <Serialization.h>
 
+// Cell padding in pixels (must match TABLE_CELL_PAD_* in ChapterHtmlSlimParser.cpp)
+static constexpr int TABLE_CELL_PADDING_X = 4;
+static constexpr int TABLE_CELL_PADDING_TOP = 1;
+
+// ---------------------------------------------------------------------------
+// PageLine
+// ---------------------------------------------------------------------------
+
 void PageLine::render(GfxRenderer& renderer, const int fontId, const int xOffset, const int yOffset) {
   block->render(renderer, fontId, xPos + xOffset, yPos + yOffset);
 }
@@ -25,6 +34,115 @@ std::unique_ptr<PageLine> PageLine::deserialize(FsFile& file) {
   return std::unique_ptr<PageLine>(new PageLine(std::move(tb), xPos, yPos));
 }
 
+// ---------------------------------------------------------------------------
+// PageTableRow
+// ---------------------------------------------------------------------------
+
+void PageTableRow::render(GfxRenderer& renderer, const int fontId, const int xOffset, const int yOffset) {
+  const int baseX = xPos + xOffset;
+  const int baseY = yPos + yOffset;
+
+  // Draw horizontal borders (top and bottom of this row)
+  renderer.drawLine(baseX, baseY, baseX + totalWidth, baseY);
+  renderer.drawLine(baseX, baseY + rowHeight, baseX + totalWidth, baseY + rowHeight);
+
+  // Draw vertical borders and render cell contents
+  // Left edge
+  renderer.drawLine(baseX, baseY, baseX, baseY + rowHeight);
+
+  for (const auto& cell : cells) {
+    // Right vertical border for this cell
+    const int cellRightX = baseX + cell.xOffset + cell.columnWidth;
+    renderer.drawLine(cellRightX, baseY, cellRightX, baseY + rowHeight);
+
+    // Render each text line within the cell
+    const int cellTextX = baseX + cell.xOffset + TABLE_CELL_PADDING_X;
+    int cellLineY = baseY + 1 + TABLE_CELL_PADDING_TOP;  // 1px border + top padding
+
+    for (const auto& line : cell.lines) {
+      line->render(renderer, fontId, cellTextX, cellLineY);
+      cellLineY += lineHeight;
+    }
+  }
+}
+
+bool PageTableRow::serialize(FsFile& file) {
+  serialization::writePod(file, xPos);
+  serialization::writePod(file, yPos);
+  serialization::writePod(file, rowHeight);
+  serialization::writePod(file, totalWidth);
+  serialization::writePod(file, lineHeight);
+
+  const uint16_t cellCount = static_cast<uint16_t>(cells.size());
+  serialization::writePod(file, cellCount);
+
+  for (const auto& cell : cells) {
+    serialization::writePod(file, cell.xOffset);
+    serialization::writePod(file, cell.columnWidth);
+
+    const uint16_t lineCount = static_cast<uint16_t>(cell.lines.size());
+    serialization::writePod(file, lineCount);
+
+    for (const auto& line : cell.lines) {
+      if (!line->serialize(file)) {
+        return false;
+      }
+    }
+  }
+
+  return true;
+}
+
+std::unique_ptr<PageTableRow> PageTableRow::deserialize(FsFile& file) {
+  int16_t xPos, yPos, rowHeight, totalWidth, lineHeight;
+  serialization::readPod(file, xPos);
+  serialization::readPod(file, yPos);
+  serialization::readPod(file, rowHeight);
+  serialization::readPod(file, totalWidth);
+  serialization::readPod(file, lineHeight);
+
+  uint16_t cellCount;
+  serialization::readPod(file, cellCount);
+
+  // Sanity check
+  if (cellCount > 100) {
+    LOG_ERR("PTR", "Deserialization failed: cell count %u exceeds maximum", cellCount);
+    return nullptr;
+  }
+
+  std::vector<PageTableCellData> cells;
+  cells.resize(cellCount);
+
+  for (uint16_t c = 0; c < cellCount; ++c) {
+    serialization::readPod(file, cells[c].xOffset);
+    serialization::readPod(file, cells[c].columnWidth);
+
+    uint16_t lineCount;
+    serialization::readPod(file, lineCount);
+
+    if (lineCount > 1000) {
+      LOG_ERR("PTR", "Deserialization failed: line count %u in cell %u exceeds maximum", lineCount, c);
+      return nullptr;
+    }
+
+    cells[c].lines.reserve(lineCount);
+    for (uint16_t l = 0; l < lineCount; ++l) {
+      auto tb = TextBlock::deserialize(file);
+      if (!tb) {
+        return nullptr;
+      }
+      cells[c].lines.push_back(std::move(tb));
+    }
+  }
+
+  return std::unique_ptr<PageTableRow>(
+      new PageTableRow(std::move(cells), rowHeight, totalWidth, lineHeight, xPos, yPos));
+}
+
+// ---------------------------------------------------------------------------
+// Page
+// ---------------------------------------------------------------------------
+
 void Page::render(GfxRenderer& renderer, const int fontId, const int xOffset, const int yOffset) const {
   for (auto& element : elements) {
     element->render(renderer, fontId, xOffset, yOffset);
@@ -36,8 +154,7 @@ bool Page::serialize(FsFile& file) const {
   serialization::writePod(file, count);
 
   for (const auto& el : elements) {
-    // Only PageLine exists currently
-    serialization::writePod(file, static_cast<uint8_t>(TAG_PageLine));
+    serialization::writePod(file, static_cast<uint8_t>(el->getTag()));
     if (!el->serialize(file)) {
       return false;
     }
@@ -59,6 +176,13 @@ std::unique_ptr<Page> Page::deserialize(FsFile& file) {
     if (tag == TAG_PageLine) {
       auto pl = PageLine::deserialize(file);
       page->elements.push_back(std::move(pl));
+    } else if (tag == TAG_PageTableRow) {
+      auto tr = PageTableRow::deserialize(file);
+      if (!tr) {
+        LOG_ERR("PGE", "Deserialization failed for PageTableRow at element %u", i);
+        return nullptr;
+      }
+      page->elements.push_back(std::move(tr));
     } else {
       LOG_ERR("PGE", "Deserialization failed: Unknown tag %u", tag);
       return nullptr;

lib/Epub/Epub/Page.h

@@ -8,6 +8,7 @@
 
 enum PageElementTag : uint8_t {
   TAG_PageLine = 1,
+  TAG_PageTableRow = 2,
 };
 
 // represents something that has been added to a page
@@ -17,6 +18,7 @@ class PageElement {
   int16_t yPos;
   explicit PageElement(const int16_t xPos, const int16_t yPos) : xPos(xPos), yPos(yPos) {}
   virtual ~PageElement() = default;
+  virtual PageElementTag getTag() const = 0;
   virtual void render(GfxRenderer& renderer, int fontId, int xOffset, int yOffset) = 0;
   virtual bool serialize(FsFile& file) = 0;
 };
@@ -29,11 +31,42 @@ class PageLine final : public PageElement {
   PageLine(std::shared_ptr<TextBlock> block, const int16_t xPos, const int16_t yPos)
       : PageElement(xPos, yPos), block(std::move(block)) {}
   const std::shared_ptr<TextBlock>& getBlock() const { return block; }
+  PageElementTag getTag() const override { return TAG_PageLine; }
   void render(GfxRenderer& renderer, int fontId, int xOffset, int yOffset) override;
   bool serialize(FsFile& file) override;
   static std::unique_ptr<PageLine> deserialize(FsFile& file);
 };
 
+/// Data for a single cell within a PageTableRow.
+struct PageTableCellData {
+  std::vector<std::shared_ptr<TextBlock>> lines;  // Laid-out text lines for this cell
+  uint16_t columnWidth = 0;                        // Width of this column in pixels
+  uint16_t xOffset = 0;                            // X offset of this cell within the row
+};
+
+/// A table row element that renders cells in a column-aligned grid with borders.
+class PageTableRow final : public PageElement {
+  std::vector<PageTableCellData> cells;
+  int16_t rowHeight;   // Total row height in pixels
+  int16_t totalWidth;  // Total table width in pixels
+  int16_t lineHeight;  // Height of one text line (for vertical positioning of cell lines)
+
+ public:
+  PageTableRow(std::vector<PageTableCellData> cells, int16_t rowHeight, int16_t totalWidth, int16_t lineHeight,
+               int16_t xPos, int16_t yPos)
+      : PageElement(xPos, yPos),
+        cells(std::move(cells)),
+        rowHeight(rowHeight),
+        totalWidth(totalWidth),
+        lineHeight(lineHeight) {}
+
+  int16_t getHeight() const { return rowHeight; }
+  PageElementTag getTag() const override { return TAG_PageTableRow; }
+  void render(GfxRenderer& renderer, int fontId, int xOffset, int yOffset) override;
+  bool serialize(FsFile& file) override;
+  static std::unique_ptr<PageTableRow> deserialize(FsFile& file);
+};
+
 class Page {
  public:
   // the list of block index and line numbers on this page

lib/Epub/Epub/ParsedText.cpp

@@ -62,6 +62,13 @@ void ParsedText::addWord(std::string word, const EpdFontFamily::Style fontStyle,
   }
   wordStyles.push_back(combinedStyle);
   wordContinues.push_back(attachToPrevious);
+  forceBreakAfter.push_back(false);
+}
+
+void ParsedText::addLineBreak() {
+  if (!words.empty()) {
+    forceBreakAfter.back() = true;
+  }
 }
 
 // Consumes data to minimize memory usage
@@ -148,6 +155,11 @@ std::vector<size_t> ParsedText::computeLineBreaks(const GfxRenderer& renderer, c
     const int effectivePageWidth = i == 0 ? pageWidth - firstLineIndent : pageWidth;
 
     for (size_t j = i; j < totalWordCount; ++j) {
+      // If the previous word has a forced line break, this line cannot include word j
+      if (j > static_cast<size_t>(i) && !forceBreakAfter.empty() && forceBreakAfter[j - 1]) {
+        break;
+      }
+
       // Add space before word j, unless it's the first word on the line or a continuation
       const int gap = j > static_cast<size_t>(i) && !continuesVec[j] ? spaceWidth : 0;
       currlen += wordWidths[j] + gap;
@@ -156,8 +168,11 @@ std::vector<size_t> ParsedText::computeLineBreaks(const GfxRenderer& renderer, c
         break;
       }
 
-      // Cannot break after word j if the next word attaches to it (continuation group)
-      if (j + 1 < totalWordCount && continuesVec[j + 1]) {
+      // Forced line break after word j overrides continuation (must end line here)
+      const bool mustBreakHere = !forceBreakAfter.empty() && forceBreakAfter[j];
+
+      // Cannot break after word j if the next word attaches to it (unless forced)
+      if (!mustBreakHere && j + 1 < totalWordCount && continuesVec[j + 1]) {
         continue;
       }
 
@@ -180,6 +195,11 @@ std::vector<size_t> ParsedText::computeLineBreaks(const GfxRenderer& renderer, c
         dp[i] = cost;
         ans[i] = j;  // j is the index of the last word in this optimal line
       }
+
+      // After evaluating cost, enforce forced break - no more words on this line
+      if (mustBreakHere) {
+        break;
+      }
     }
 
     // Handle oversized word: if no valid configuration found, force single-word line
@@ -254,6 +274,11 @@ std::vector<size_t> ParsedText::computeHyphenatedLineBreaks(const GfxRenderer& r
 
     // Consume as many words as possible for current line, splitting when prefixes fit
     while (currentIndex < wordWidths.size()) {
+      // If the previous word has a forced line break, stop - this word starts a new line
+      if (currentIndex > lineStart && !forceBreakAfter.empty() && forceBreakAfter[currentIndex - 1]) {
+        break;
+      }
+
       const bool isFirstWord = currentIndex == lineStart;
       const int spacing = isFirstWord || continuesVec[currentIndex] ? 0 : spaceWidth;
       const int candidateWidth = spacing + wordWidths[currentIndex];
@@ -262,6 +287,11 @@ std::vector<size_t> ParsedText::computeHyphenatedLineBreaks(const GfxRenderer& r
       if (lineWidth + candidateWidth <= effectivePageWidth) {
         lineWidth += candidateWidth;
         ++currentIndex;
+
+        // If the word we just added has a forced break, end this line now
+        if (!forceBreakAfter.empty() && forceBreakAfter[currentIndex - 1]) {
+          break;
+        }
         continue;
       }
 
@@ -287,7 +317,12 @@ std::vector<size_t> ParsedText::computeHyphenatedLineBreaks(const GfxRenderer& r
 
     // Don't break before a continuation word (e.g., orphaned "?" after "question").
     // Backtrack to the start of the continuation group so the whole group moves to the next line.
+    // But don't backtrack past a forced break point.
     while (currentIndex > lineStart + 1 && currentIndex < wordWidths.size() && continuesVec[currentIndex]) {
+      // Don't backtrack past a forced break
+      if (!forceBreakAfter.empty() && forceBreakAfter[currentIndex - 1]) {
+        break;
+      }
       --currentIndex;
     }
 
@@ -361,6 +396,13 @@ bool ParsedText::hyphenateWordAtIndex(const size_t wordIndex, const int availabl
   wordContinues[wordIndex] = false;
   wordContinues.insert(wordContinues.begin() + wordIndex + 1, originalContinuedToNext);
 
+  // Forced break belongs to the original whole word; transfer it to the remainder (last part).
+  if (!forceBreakAfter.empty()) {
+    const bool originalForceBreak = forceBreakAfter[wordIndex];
+    forceBreakAfter[wordIndex] = false;  // prefix doesn't force break
+    forceBreakAfter.insert(forceBreakAfter.begin() + wordIndex + 1, originalForceBreak);
+  }
+
   // Update cached widths to reflect the new prefix/remainder pairing.
   wordWidths[wordIndex] = static_cast<uint16_t>(chosenWidth);
   const uint16_t remainderWidth = measureWordWidth(renderer, fontId, remainder, style);
@@ -447,3 +489,22 @@ void ParsedText::extractLine(const size_t breakIndex, const int pageWidth, const
   processLine(
       std::make_shared<TextBlock>(std::move(lineWords), std::move(lineXPos), std::move(lineWordStyles), blockStyle));
 }
+
+uint16_t ParsedText::getNaturalWidth(const GfxRenderer& renderer, const int fontId) const {
+  if (words.empty()) {
+    return 0;
+  }
+
+  const int spaceWidth = renderer.getSpaceWidth(fontId);
+  int totalWidth = 0;
+
+  for (size_t i = 0; i < words.size(); ++i) {
+    totalWidth += measureWordWidth(renderer, fontId, words[i], wordStyles[i]);
+    // Add a space before this word unless it's the first word or a continuation
+    if (i > 0 && !wordContinues[i]) {
+      totalWidth += spaceWidth;
+    }
+  }
+
+  return static_cast<uint16_t>(std::min(totalWidth, static_cast<int>(UINT16_MAX)));
+}

lib/Epub/Epub/ParsedText.h

@@ -16,6 +16,7 @@ class ParsedText {
   std::vector<std::string> words;
   std::vector<EpdFontFamily::Style> wordStyles;
   std::vector<bool> wordContinues;    // true = word attaches to previous (no space before it)
+  std::vector<bool> forceBreakAfter;  // true = mandatory line break after this word (e.g. <br> in table cells)
   BlockStyle blockStyle;
   bool extraParagraphSpacing;
   bool hyphenationEnabled;
@@ -40,6 +41,10 @@ class ParsedText {
   ~ParsedText() = default;
 
   void addWord(std::string word, EpdFontFamily::Style fontStyle, bool underline = false, bool attachToPrevious = false);
+
+  /// Mark a forced line break after the last word (e.g. for <br> within table cells).
+  /// If no words have been added yet, this is a no-op.
+  void addLineBreak();
   void setBlockStyle(const BlockStyle& blockStyle) { this->blockStyle = blockStyle; }
   BlockStyle& getBlockStyle() { return blockStyle; }
   size_t size() const { return words.size(); }
@@ -47,4 +52,9 @@ class ParsedText {
   void layoutAndExtractLines(const GfxRenderer& renderer, int fontId, uint16_t viewportWidth,
                              const std::function<void(std::shared_ptr<TextBlock>)>& processLine,
                              bool includeLastLine = true);
+
+  /// Returns the "natural" width of the content if it were laid out on a single line
+  /// (sum of word widths + space widths between non-continuation words).
+  /// Used by table layout to determine column widths before line-breaking.
+  uint16_t getNaturalWidth(const GfxRenderer& renderer, int fontId) const;
 };

lib/Epub/Epub/TableData.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <memory>
+#include <vector>
+
+#include "ParsedText.h"
+#include "css/CssStyle.h"
+
+/// A single cell in a table row.
+struct TableCell {
+  std::unique_ptr<ParsedText> content;
+  bool isHeader = false;   // true for <th>, false for <td>
+  int colspan = 1;          // number of logical columns this cell spans
+  CssLength widthHint;      // width hint from HTML attribute or CSS (if hasWidthHint)
+  bool hasWidthHint = false;
+};
+
+/// A single row in a table.
+struct TableRow {
+  std::vector<TableCell> cells;
+};
+
+/// Buffered table data collected during SAX parsing.
+/// The entire table must be buffered before layout because column widths
+/// depend on content across all rows.
+struct TableData {
+  std::vector<TableRow> rows;
+  std::vector<CssLength> colWidthHints;  // width hints from <col> tags, indexed by logical column
+};

lib/Epub/Epub/css/CssParser.cpp

@@ -413,6 +413,9 @@ CssStyle CssParser::parseDeclarations(const std::string& declBlock) {
         style.defined.paddingTop = style.defined.paddingRight = style.defined.paddingBottom =
             style.defined.paddingLeft = 1;
       }
+    } else if (propName == "width") {
+      style.width = interpretLength(propValue);
+      style.defined.width = 1;
     }
   }
 

lib/Epub/Epub/css/CssStyle.h

@@ -69,6 +69,7 @@ struct CssPropertyFlags {
   uint16_t paddingBottom : 1;
   uint16_t paddingLeft : 1;
   uint16_t paddingRight : 1;
+  uint16_t width : 1;
 
   CssPropertyFlags()
       : textAlign(0),
@@ -83,17 +84,19 @@ struct CssPropertyFlags {
         paddingTop(0),
         paddingBottom(0),
         paddingLeft(0),
-        paddingRight(0) {}
+        paddingRight(0),
+        width(0) {}
 
   [[nodiscard]] bool anySet() const {
     return textAlign || fontStyle || fontWeight || textDecoration || textIndent || marginTop || marginBottom ||
-           marginLeft || marginRight || paddingTop || paddingBottom || paddingLeft || paddingRight;
+           marginLeft || marginRight || paddingTop || paddingBottom || paddingLeft || paddingRight || width;
   }
 
   void clearAll() {
     textAlign = fontStyle = fontWeight = textDecoration = textIndent = 0;
     marginTop = marginBottom = marginLeft = marginRight = 0;
     paddingTop = paddingBottom = paddingLeft = paddingRight = 0;
+    width = 0;
   }
 };
 
@@ -115,6 +118,7 @@ struct CssStyle {
   CssLength paddingBottom;  // Padding after
   CssLength paddingLeft;    // Padding left
   CssLength paddingRight;   // Padding right
+  CssLength width;           // Element width (used for table columns/cells)
 
   CssPropertyFlags defined;  // Tracks which properties were explicitly set
 
@@ -173,6 +177,10 @@ struct CssStyle {
       paddingRight = base.paddingRight;
       defined.paddingRight = 1;
     }
+    if (base.hasWidth()) {
+      width = base.width;
+      defined.width = 1;
+    }
   }
 
   [[nodiscard]] bool hasTextAlign() const { return defined.textAlign; }
@@ -188,6 +196,7 @@ struct CssStyle {
   [[nodiscard]] bool hasPaddingBottom() const { return defined.paddingBottom; }
   [[nodiscard]] bool hasPaddingLeft() const { return defined.paddingLeft; }
   [[nodiscard]] bool hasPaddingRight() const { return defined.paddingRight; }
+  [[nodiscard]] bool hasWidth() const { return defined.width; }
 
   void reset() {
     textAlign = CssTextAlign::Left;
@@ -197,6 +206,7 @@ struct CssStyle {
     textIndent = CssLength{};
     marginTop = marginBottom = marginLeft = marginRight = CssLength{};
     paddingTop = paddingBottom = paddingLeft = paddingRight = CssLength{};
+    width = CssLength{};
     defined.clearAll();
   }
 };

lib/Epub/Epub/hyphenation/LanguageRegistry.cpp

@@ -1,48 +1,84 @@
 #include "LanguageRegistry.h"
 
 #include <algorithm>
-#include <array>
+#include <vector>
 
 #include "HyphenationCommon.h"
+#ifndef OMIT_HYPH_DE
 #include "generated/hyph-de.trie.h"
+#endif
+#ifndef OMIT_HYPH_EN
 #include "generated/hyph-en.trie.h"
+#endif
+#ifndef OMIT_HYPH_ES
 #include "generated/hyph-es.trie.h"
+#endif
+#ifndef OMIT_HYPH_FR
 #include "generated/hyph-fr.trie.h"
+#endif
+#ifndef OMIT_HYPH_IT
 #include "generated/hyph-it.trie.h"
+#endif
+#ifndef OMIT_HYPH_RU
 #include "generated/hyph-ru.trie.h"
+#endif
 
 namespace {
 
+#ifndef OMIT_HYPH_EN
 // English hyphenation patterns (3/3 minimum prefix/suffix length)
 LanguageHyphenator englishHyphenator(en_us_patterns, isLatinLetter, toLowerLatin, 3, 3);
+#endif
+#ifndef OMIT_HYPH_FR
 LanguageHyphenator frenchHyphenator(fr_patterns, isLatinLetter, toLowerLatin);
+#endif
+#ifndef OMIT_HYPH_DE
 LanguageHyphenator germanHyphenator(de_patterns, isLatinLetter, toLowerLatin);
+#endif
+#ifndef OMIT_HYPH_RU
 LanguageHyphenator russianHyphenator(ru_ru_patterns, isCyrillicLetter, toLowerCyrillic);
+#endif
+#ifndef OMIT_HYPH_ES
 LanguageHyphenator spanishHyphenator(es_patterns, isLatinLetter, toLowerLatin);
+#endif
+#ifndef OMIT_HYPH_IT
 LanguageHyphenator italianHyphenator(it_patterns, isLatinLetter, toLowerLatin);
+#endif
 
-using EntryArray = std::array<LanguageEntry, 6>;
-
-const EntryArray& entries() {
-  static const EntryArray kEntries = {{{"english", "en", &englishHyphenator},
+const LanguageEntryView entries() {
+  static const std::vector<LanguageEntry> kEntries = {
+#ifndef OMIT_HYPH_EN
+      {"english", "en", &englishHyphenator},
+#endif
+#ifndef OMIT_HYPH_FR
       {"french", "fr", &frenchHyphenator},
+#endif
+#ifndef OMIT_HYPH_DE
       {"german", "de", &germanHyphenator},
+#endif
+#ifndef OMIT_HYPH_RU
       {"russian", "ru", &russianHyphenator},
+#endif
+#ifndef OMIT_HYPH_ES
       {"spanish", "es", &spanishHyphenator},
-                                       {"italian", "it", &italianHyphenator}}};
-  return kEntries;
+#endif
+#ifndef OMIT_HYPH_IT
+      {"italian", "it", &italianHyphenator},
+#endif
+  };
+  static const LanguageEntryView view{kEntries.data(), kEntries.size()};
+  return view;
 }
 
 }  // namespace
 
 const LanguageHyphenator* getLanguageHyphenatorForPrimaryTag(const std::string& primaryTag) {
-  const auto& allEntries = entries();
+  const auto allEntries = entries();
   const auto it = std::find_if(allEntries.begin(), allEntries.end(),
                                [&primaryTag](const LanguageEntry& entry) { return primaryTag == entry.primaryTag; });
   return (it != allEntries.end()) ? it->hyphenator : nullptr;
 }
 
 LanguageEntryView getLanguageEntries() {
-  const auto& allEntries = entries();
-  return LanguageEntryView{allEntries.data(), allEntries.size()};
+  return entries();
 }

lib/Epub/Epub/parsers/ChapterHtmlSlimParser.cpp

@@ -5,6 +5,8 @@
 #include <Logging.h>
 #include <expat.h>
 
+#include <algorithm>
+
 #include "../Page.h"
 #include "../htmlEntities.h"
 
@@ -32,8 +34,30 @@ constexpr int NUM_IMAGE_TAGS = sizeof(IMAGE_TAGS) / sizeof(IMAGE_TAGS[0]);
 const char* SKIP_TAGS[] = {"head"};
 constexpr int NUM_SKIP_TAGS = sizeof(SKIP_TAGS) / sizeof(SKIP_TAGS[0]);
 
+// Table tags that are transparent containers (just depth tracking, no special handling)
+const char* TABLE_TRANSPARENT_TAGS[] = {"thead", "tbody", "tfoot", "colgroup"};
+constexpr int NUM_TABLE_TRANSPARENT_TAGS = sizeof(TABLE_TRANSPARENT_TAGS) / sizeof(TABLE_TRANSPARENT_TAGS[0]);
+
+// Table tags to skip entirely (their children produce no useful output)
+const char* TABLE_SKIP_TAGS[] = {"caption"};
+constexpr int NUM_TABLE_SKIP_TAGS = sizeof(TABLE_SKIP_TAGS) / sizeof(TABLE_SKIP_TAGS[0]);
+
 bool isWhitespace(const char c) { return c == ' ' || c == '\r' || c == '\n' || c == '\t'; }
 
+// Parse an HTML width attribute value into a CssLength.
+// "200" -> 200px, "50%" -> 50 percent. Returns false if the value can't be parsed.
+static bool parseHtmlWidthAttr(const char* value, CssLength& out) {
+  char* end = nullptr;
+  const float num = strtof(value, &end);
+  if (end == value || num < 0) return false;
+  if (*end == '%') {
+    out = CssLength(num, CssUnit::Percent);
+  } else {
+    out = CssLength(num, CssUnit::Pixels);
+  }
+  return true;
+}
+
 // given the start and end of a tag, check to see if it matches a known tag
 bool matches(const char* tag_name, const char* possible_tags[], const int possible_tag_count) {
   for (int i = 0; i < possible_tag_count; i++) {
@@ -91,13 +115,37 @@ void ChapterHtmlSlimParser::flushPartWordBuffer() {
 
   // flush the buffer
   partWordBuffer[partWordBufferIndex] = '\0';
-  currentTextBlock->addWord(partWordBuffer, fontStyle, false, nextWordContinues);
+
+  // Handle double-encoded &nbsp; entities (e.g. &amp;nbsp; in source -> literal "&nbsp;" after
+  // XML parsing). Common in Wikipedia and other generated EPUBs. Replace with a space so the text
+  // renders cleanly. The space stays within the word, preserving non-breaking behavior.
+  std::string flushedWord(partWordBuffer);
+  size_t entityPos = 0;
+  while ((entityPos = flushedWord.find("&nbsp;", entityPos)) != std::string::npos) {
+    flushedWord.replace(entityPos, 6, " ");
+    entityPos += 1;
+  }
+
+  currentTextBlock->addWord(flushedWord, fontStyle, false, nextWordContinues);
   partWordBufferIndex = 0;
   nextWordContinues = false;
 }
 
 // start a new text block if needed
 void ChapterHtmlSlimParser::startNewTextBlock(const BlockStyle& blockStyle) {
+  // When inside a table cell, don't lay out to the page -- insert a forced line break
+  // within the cell's ParsedText so that block elements (p, div, br) create visual breaks.
+  if (inTable) {
+    if (partWordBufferIndex > 0) {
+      flushPartWordBuffer();
+    }
+    if (currentTextBlock && !currentTextBlock->isEmpty()) {
+      currentTextBlock->addLineBreak();
+    }
+    nextWordContinues = false;
+    return;
+  }
+
   nextWordContinues = false;  // New block = new paragraph, no continuation
   if (currentTextBlock) {
     // already have a text block running and it is empty - just reuse it
@@ -140,21 +188,184 @@ void XMLCALL ChapterHtmlSlimParser::startElement(void* userData, const XML_Char*
   centeredBlockStyle.textAlignDefined = true;
   centeredBlockStyle.alignment = CssTextAlign::Center;
 
-  // Special handling for tables - show placeholder text instead of dropping silently
+  // --- Table handling ---
   if (strcmp(name, "table") == 0) {
-    // Add placeholder text
-    self->startNewTextBlock(centeredBlockStyle);
-
-    self->italicUntilDepth = min(self->italicUntilDepth, self->depth);
-    // Advance depth before processing character data (like you would for an element with text)
+    if (self->inTable) {
+      // Nested table: skip it entirely for v1
+      self->skipUntilDepth = self->depth;
       self->depth += 1;
-    self->characterData(userData, "[Table omitted]", strlen("[Table omitted]"));
-
-    // Skip table contents (skip until parent as we pre-advanced depth above)
-    self->skipUntilDepth = self->depth - 1;
       return;
     }
 
+    // Flush any pending content before the table
+    if (self->currentTextBlock && !self->currentTextBlock->isEmpty()) {
+      self->makePages();
+    }
+
+    self->inTable = true;
+    self->tableData.reset(new TableData());
+
+    // Create a safe empty currentTextBlock so character data outside cells
+    // (e.g. whitespace between tags) doesn't crash
+    auto tableBlockStyle = BlockStyle();
+    tableBlockStyle.alignment = CssTextAlign::Left;
+    self->currentTextBlock.reset(new ParsedText(self->extraParagraphSpacing, self->hyphenationEnabled, tableBlockStyle));
+
+    self->depth += 1;
+    return;
+  }
+
+  // Table structure tags (only when inside a table)
+  if (self->inTable) {
+    if (strcmp(name, "tr") == 0) {
+      self->tableData->rows.push_back(TableRow());
+      self->depth += 1;
+      return;
+    }
+
+    // <col> — capture width hint for column sizing
+    if (strcmp(name, "col") == 0) {
+      CssLength widthHint;
+      bool hasHint = false;
+
+      // Parse HTML width attribute
+      if (atts != nullptr) {
+        for (int i = 0; atts[i]; i += 2) {
+          if (strcmp(atts[i], "width") == 0) {
+            hasHint = parseHtmlWidthAttr(atts[i + 1], widthHint);
+            break;
+          }
+        }
+      }
+
+      // CSS width (inline style) overrides HTML attribute
+      if (self->cssParser) {
+        std::string styleAttr;
+        if (atts != nullptr) {
+          for (int i = 0; atts[i]; i += 2) {
+            if (strcmp(atts[i], "style") == 0) {
+              styleAttr = atts[i + 1];
+              break;
+            }
+          }
+        }
+        if (!styleAttr.empty()) {
+          CssStyle inlineStyle = CssParser::parseInlineStyle(styleAttr);
+          if (inlineStyle.hasWidth()) {
+            widthHint = inlineStyle.width;
+            hasHint = true;
+          }
+        }
+      }
+
+      if (hasHint) {
+        self->tableData->colWidthHints.push_back(widthHint);
+      } else {
+        // Push a zero-value placeholder to maintain index alignment
+        self->tableData->colWidthHints.push_back(CssLength());
+      }
+
+      self->depth += 1;
+      return;
+    }
+
+    if (strcmp(name, "td") == 0 || strcmp(name, "th") == 0) {
+      const bool isHeader = strcmp(name, "th") == 0;
+
+      // Parse colspan and width attributes
+      int colspan = 1;
+      CssLength cellWidthHint;
+      bool hasCellWidthHint = false;
+      std::string cellStyleAttr;
+
+      if (atts != nullptr) {
+        for (int i = 0; atts[i]; i += 2) {
+          if (strcmp(atts[i], "colspan") == 0) {
+            colspan = atoi(atts[i + 1]);
+            if (colspan < 1) colspan = 1;
+          } else if (strcmp(atts[i], "width") == 0) {
+            hasCellWidthHint = parseHtmlWidthAttr(atts[i + 1], cellWidthHint);
+          } else if (strcmp(atts[i], "style") == 0) {
+            cellStyleAttr = atts[i + 1];
+          }
+        }
+      }
+
+      // CSS width (inline style or stylesheet) overrides HTML attribute
+      if (self->cssParser) {
+        std::string classAttr;
+        if (atts != nullptr) {
+          for (int i = 0; atts[i]; i += 2) {
+            if (strcmp(atts[i], "class") == 0) {
+              classAttr = atts[i + 1];
+              break;
+            }
+          }
+        }
+        CssStyle cellCssStyle = self->cssParser->resolveStyle(name, classAttr);
+        if (!cellStyleAttr.empty()) {
+          CssStyle inlineStyle = CssParser::parseInlineStyle(cellStyleAttr);
+          cellCssStyle.applyOver(inlineStyle);
+        }
+        if (cellCssStyle.hasWidth()) {
+          cellWidthHint = cellCssStyle.width;
+          hasCellWidthHint = true;
+        }
+      }
+
+      // Ensure there's a row to add cells to
+      if (self->tableData->rows.empty()) {
+        self->tableData->rows.push_back(TableRow());
+      }
+
+      // Create a new ParsedText for this cell (characterData will flow into it)
+      auto cellBlockStyle = BlockStyle();
+      cellBlockStyle.alignment = CssTextAlign::Left;
+      cellBlockStyle.textAlignDefined = true;
+      // Explicitly disable paragraph indent for table cells
+      cellBlockStyle.textIndent = 0;
+      cellBlockStyle.textIndentDefined = true;
+      self->currentTextBlock.reset(
+          new ParsedText(self->extraParagraphSpacing, self->hyphenationEnabled, cellBlockStyle));
+      self->nextWordContinues = false;
+
+      // Track the cell
+      auto& currentRow = self->tableData->rows.back();
+      currentRow.cells.push_back(TableCell());
+      currentRow.cells.back().isHeader = isHeader;
+      currentRow.cells.back().colspan = colspan;
+      if (hasCellWidthHint) {
+        currentRow.cells.back().widthHint = cellWidthHint;
+        currentRow.cells.back().hasWidthHint = true;
+      }
+
+      // Apply bold for header cells
+      if (isHeader) {
+        self->boldUntilDepth = std::min(self->boldUntilDepth, self->depth);
+        self->updateEffectiveInlineStyle();
+      }
+
+      self->depth += 1;
+      return;
+    }
+
+    // Transparent table container tags
+    if (matches(name, TABLE_TRANSPARENT_TAGS, NUM_TABLE_TRANSPARENT_TAGS)) {
+      self->depth += 1;
+      return;
+    }
+
+    // Skip colgroup, col, caption
+    if (matches(name, TABLE_SKIP_TAGS, NUM_TABLE_SKIP_TAGS)) {
+      self->skipUntilDepth = self->depth;
+      self->depth += 1;
+      return;
+    }
+
+    // Other tags inside table cells (p, div, span, b, i, etc.) fall through
+    // to the normal handling below. startNewTextBlock is a no-op when inTable.
+  }
+
   if (matches(name, IMAGE_TAGS, NUM_IMAGE_TAGS)) {
     // TODO: Start processing image tags
     std::string alt = "[Image]";
@@ -408,7 +619,8 @@ void XMLCALL ChapterHtmlSlimParser::characterData(void* userData, const XML_Char
   // There should be enough here to build out 1-2 full pages and doing this will free up a lot of
   // memory.
   // Spotted when reading Intermezzo, there are some really long text blocks in there.
-  if (self->currentTextBlock->size() > 750) {
+  // Skip this when inside a table - cell content is buffered for later layout.
+  if (!self->inTable && self->currentTextBlock->size() > 750) {
     LOG_DBG("EHP", "Text block too long, splitting into multiple pages");
     self->currentTextBlock->layoutAndExtractLines(
         self->renderer, self->fontId, self->viewportWidth,
@@ -446,15 +658,17 @@ void XMLCALL ChapterHtmlSlimParser::endElement(void* userData, const XML_Char* n
 
   const bool styleWillChange = willPopStyleStack || willClearBold || willClearItalic || willClearUnderline;
   const bool headerOrBlockTag = isHeaderOrBlock(name);
+  const bool isTableCellTag = strcmp(name, "td") == 0 || strcmp(name, "th") == 0;
+  const bool isTableTag = strcmp(name, "table") == 0;
 
   // Flush buffer with current style BEFORE any style changes
   if (self->partWordBufferIndex > 0) {
     // Flush if style will change OR if we're closing a block/structural element
-    const bool isInlineTag = !headerOrBlockTag && strcmp(name, "table") != 0 &&
+    const bool isInlineTag = !headerOrBlockTag && !isTableTag && !isTableCellTag &&
                              !matches(name, IMAGE_TAGS, NUM_IMAGE_TAGS) && self->depth != 1;
     const bool shouldFlush = styleWillChange || headerOrBlockTag || matches(name, BOLD_TAGS, NUM_BOLD_TAGS) ||
                              matches(name, ITALIC_TAGS, NUM_ITALIC_TAGS) ||
-                             matches(name, UNDERLINE_TAGS, NUM_UNDERLINE_TAGS) || strcmp(name, "table") == 0 ||
+                             matches(name, UNDERLINE_TAGS, NUM_UNDERLINE_TAGS) || isTableTag || isTableCellTag ||
                              matches(name, IMAGE_TAGS, NUM_IMAGE_TAGS) || self->depth == 1;
 
     if (shouldFlush) {
@@ -466,6 +680,57 @@ void XMLCALL ChapterHtmlSlimParser::endElement(void* userData, const XML_Char* n
     }
   }
 
+  // --- Table cell/row/table close handling ---
+  if (self->inTable) {
+    if (isTableCellTag) {
+      // Save the current cell content into the table data
+      if (self->tableData && !self->tableData->rows.empty()) {
+        auto& currentRow = self->tableData->rows.back();
+        if (!currentRow.cells.empty()) {
+          currentRow.cells.back().content = std::move(self->currentTextBlock);
+        }
+      }
+
+      // Create a safe empty ParsedText so character data between cells doesn't crash
+      auto safeBlockStyle = BlockStyle();
+      safeBlockStyle.alignment = CssTextAlign::Left;
+      self->currentTextBlock.reset(
+          new ParsedText(self->extraParagraphSpacing, self->hyphenationEnabled, safeBlockStyle));
+      self->nextWordContinues = false;
+    }
+
+    if (isTableTag) {
+      // Process the entire buffered table
+      self->depth -= 1;
+
+      // Clean up style state for this depth
+      if (self->skipUntilDepth == self->depth) self->skipUntilDepth = INT_MAX;
+      if (self->boldUntilDepth == self->depth) self->boldUntilDepth = INT_MAX;
+      if (self->italicUntilDepth == self->depth) self->italicUntilDepth = INT_MAX;
+      if (self->underlineUntilDepth == self->depth) self->underlineUntilDepth = INT_MAX;
+      if (!self->inlineStyleStack.empty() && self->inlineStyleStack.back().depth == self->depth) {
+        self->inlineStyleStack.pop_back();
+        self->updateEffectiveInlineStyle();
+      }
+
+      self->processTable();
+
+      self->inTable = false;
+      self->tableData.reset();
+
+      // Restore a fresh text block for content after the table
+      auto paragraphAlignmentBlockStyle = BlockStyle();
+      paragraphAlignmentBlockStyle.textAlignDefined = true;
+      const auto align = (self->paragraphAlignment == static_cast<uint8_t>(CssTextAlign::None))
+                             ? CssTextAlign::Justify
+                             : static_cast<CssTextAlign>(self->paragraphAlignment);
+      paragraphAlignmentBlockStyle.alignment = align;
+      self->currentTextBlock.reset(
+          new ParsedText(self->extraParagraphSpacing, self->hyphenationEnabled, paragraphAlignmentBlockStyle));
+      return;  // depth already decremented, skip the normal endElement cleanup
+    }
+  }
+
   self->depth -= 1;
 
   // Leaving skip
@@ -653,3 +918,335 @@ void ChapterHtmlSlimParser::makePages() {
     currentPageNextY += lineHeight / 2;
   }
 }
+
+// ---------------------------------------------------------------------------
+// Table processing
+// ---------------------------------------------------------------------------
+
+// Cell padding in pixels (horizontal space between grid line and cell text)
+static constexpr int TABLE_CELL_PAD_X = 4;
+// Vertical cell padding — asymmetric because font metrics include internal leading (whitespace
+// above glyphs), so the top already has built-in visual space. Less explicit padding on top,
+// more on bottom, produces visually balanced results.
+static constexpr int TABLE_CELL_PAD_TOP = 1;
+static constexpr int TABLE_CELL_PAD_BOTTOM = 3;
+// Minimum usable column width in pixels (below this text is unreadable)
+static constexpr int TABLE_MIN_COL_WIDTH = 30;
+// Grid line width in pixels
+static constexpr int TABLE_GRID_LINE_PX = 1;
+
+void ChapterHtmlSlimParser::addTableRowToPage(std::shared_ptr<PageTableRow> row) {
+  if (!currentPage) {
+    currentPage.reset(new Page());
+    currentPageNextY = 0;
+  }
+
+  const int16_t rowH = row->getHeight();
+
+  // If this row doesn't fit on the current page, start a new one
+  if (currentPageNextY + rowH > viewportHeight) {
+    completePageFn(std::move(currentPage));
+    currentPage.reset(new Page());
+    currentPageNextY = 0;
+  }
+
+  row->xPos = 0;
+  row->yPos = currentPageNextY;
+  currentPage->elements.push_back(std::move(row));
+  currentPageNextY += rowH;
+}
+
+void ChapterHtmlSlimParser::processTable() {
+  if (!tableData || tableData->rows.empty()) {
+    return;
+  }
+
+  if (!currentPage) {
+    currentPage.reset(new Page());
+    currentPageNextY = 0;
+  }
+
+  const int lh = static_cast<int>(renderer.getLineHeight(fontId) * lineCompression);
+
+  // 1. Determine logical column count using colspan.
+  //    Each cell occupies cell.colspan logical columns. The total for a row is the sum of colspans.
+  size_t numCols = 0;
+  for (const auto& row : tableData->rows) {
+    size_t rowLogicalCols = 0;
+    for (const auto& cell : row.cells) {
+      rowLogicalCols += static_cast<size_t>(cell.colspan);
+    }
+    numCols = std::max(numCols, rowLogicalCols);
+  }
+
+  if (numCols == 0) {
+    return;
+  }
+
+  // 2. Measure natural width of each cell and compute per-column max natural width.
+  //    Only non-spanning cells (colspan==1) contribute to individual column widths.
+  //    Spanning cells use the combined width of their spanned columns.
+  std::vector<uint16_t> colNaturalWidth(numCols, 0);
+
+  for (const auto& row : tableData->rows) {
+    size_t logicalCol = 0;
+    for (const auto& cell : row.cells) {
+      if (cell.colspan == 1 && cell.content && !cell.content->isEmpty()) {
+        if (logicalCol < numCols) {
+          const uint16_t w = cell.content->getNaturalWidth(renderer, fontId);
+          if (w > colNaturalWidth[logicalCol]) {
+            colNaturalWidth[logicalCol] = w;
+          }
+        }
+      }
+      logicalCol += static_cast<size_t>(cell.colspan);
+    }
+  }
+
+  // 3. Calculate column widths to fit viewport.
+  //    Available width = viewport - outer borders - internal column borders - cell padding
+  const int totalGridLines = static_cast<int>(numCols) + 1;  // left + between columns + right
+  const int totalPadding = static_cast<int>(numCols) * TABLE_CELL_PAD_X * 2;
+  const int availableForContent = viewportWidth - totalGridLines * TABLE_GRID_LINE_PX - totalPadding;
+
+  // 3a. Resolve width hints per column.
+  //     Priority: <col> hints > max cell hint (colspan=1 only).
+  //     Percentages are relative to availableForContent.
+  const float emSize = static_cast<float>(lh);
+  const float containerW = static_cast<float>(std::max(availableForContent, 0));
+
+  std::vector<int> colHintedWidth(numCols, -1);  // -1 = no hint
+
+  // From <col> tags
+  for (size_t c = 0; c < numCols && c < tableData->colWidthHints.size(); ++c) {
+    const auto& hint = tableData->colWidthHints[c];
+    if (hint.value > 0) {
+      int px = static_cast<int>(hint.toPixels(emSize, containerW));
+      if (px > 0) {
+        colHintedWidth[c] = std::max(px, TABLE_MIN_COL_WIDTH);
+      }
+    }
+  }
+
+  // From <td>/<th> cell width hints (only override if no <col> hint exists for this column)
+  for (const auto& row : tableData->rows) {
+    size_t logicalCol = 0;
+    for (const auto& cell : row.cells) {
+      if (cell.colspan == 1 && cell.hasWidthHint && logicalCol < numCols) {
+        if (colHintedWidth[logicalCol] < 0) {  // no <col> hint yet
+          int px = static_cast<int>(cell.widthHint.toPixels(emSize, containerW));
+          if (px > colHintedWidth[logicalCol]) {
+            colHintedWidth[logicalCol] = std::max(px, TABLE_MIN_COL_WIDTH);
+          }
+        }
+      }
+      logicalCol += static_cast<size_t>(cell.colspan);
+    }
+  }
+
+  // 3b. Distribute column widths: hinted columns get their hint, unhinted use auto-sizing.
+  std::vector<uint16_t> colWidths(numCols, 0);
+
+  if (availableForContent <= 0) {
+    const uint16_t equalWidth = static_cast<uint16_t>(viewportWidth / numCols);
+    for (size_t c = 0; c < numCols; ++c) {
+      colWidths[c] = equalWidth;
+    }
+  } else {
+    // First, assign hinted columns and track how much space they consume
+    int hintedSpaceUsed = 0;
+    size_t unhintedCount = 0;
+    for (size_t c = 0; c < numCols; ++c) {
+      if (colHintedWidth[c] > 0) {
+        hintedSpaceUsed += colHintedWidth[c];
+      } else {
+        unhintedCount++;
+      }
+    }
+
+    // If hinted columns exceed available space, scale them down proportionally
+    if (hintedSpaceUsed > availableForContent && hintedSpaceUsed > 0) {
+      for (size_t c = 0; c < numCols; ++c) {
+        if (colHintedWidth[c] > 0) {
+          colHintedWidth[c] = colHintedWidth[c] * availableForContent / hintedSpaceUsed;
+          colHintedWidth[c] = std::max(colHintedWidth[c], TABLE_MIN_COL_WIDTH);
+        }
+      }
+      // Recalculate
+      hintedSpaceUsed = 0;
+      for (size_t c = 0; c < numCols; ++c) {
+        if (colHintedWidth[c] > 0) {
+          hintedSpaceUsed += colHintedWidth[c];
+        }
+      }
+    }
+
+    // Assign hinted columns
+    for (size_t c = 0; c < numCols; ++c) {
+      if (colHintedWidth[c] > 0) {
+        colWidths[c] = static_cast<uint16_t>(colHintedWidth[c]);
+      }
+    }
+
+    // Distribute remaining space among unhinted columns using the existing algorithm
+    const int remainingForUnhinted = std::max(availableForContent - hintedSpaceUsed, 0);
+
+    if (unhintedCount > 0 && remainingForUnhinted > 0) {
+      // Compute total natural width of unhinted columns
+      int totalNaturalUnhinted = 0;
+      for (size_t c = 0; c < numCols; ++c) {
+        if (colHintedWidth[c] <= 0) {
+          totalNaturalUnhinted += colNaturalWidth[c];
+        }
+      }
+
+      if (totalNaturalUnhinted <= remainingForUnhinted) {
+        // All unhinted content fits — distribute extra space equally among unhinted columns
+        const int extraSpace = remainingForUnhinted - totalNaturalUnhinted;
+        const int perColExtra = extraSpace / static_cast<int>(unhintedCount);
+        for (size_t c = 0; c < numCols; ++c) {
+          if (colHintedWidth[c] <= 0) {
+            colWidths[c] = static_cast<uint16_t>(colNaturalWidth[c] + perColExtra);
+          }
+        }
+      } else {
+        // Unhinted content exceeds remaining space — two-pass fair-share among unhinted columns
+        const int equalShare = remainingForUnhinted / static_cast<int>(unhintedCount);
+
+        int spaceUsedByFitting = 0;
+        int naturalOfWide = 0;
+        size_t wideCount = 0;
+
+        for (size_t c = 0; c < numCols; ++c) {
+          if (colHintedWidth[c] <= 0) {
+            if (static_cast<int>(colNaturalWidth[c]) <= equalShare) {
+              colWidths[c] = colNaturalWidth[c];
+              spaceUsedByFitting += colNaturalWidth[c];
+            } else {
+              naturalOfWide += colNaturalWidth[c];
+              wideCount++;
+            }
+          }
+        }
+
+        const int wideSpace = remainingForUnhinted - spaceUsedByFitting;
+        for (size_t c = 0; c < numCols; ++c) {
+          if (colHintedWidth[c] <= 0 && static_cast<int>(colNaturalWidth[c]) > equalShare) {
+            if (naturalOfWide > 0 && wideCount > 1) {
+              int proportional = static_cast<int>(colNaturalWidth[c]) * wideSpace / naturalOfWide;
+              colWidths[c] = static_cast<uint16_t>(std::max(proportional, TABLE_MIN_COL_WIDTH));
+            } else {
+              colWidths[c] = static_cast<uint16_t>(std::max(wideSpace, TABLE_MIN_COL_WIDTH));
+            }
+          }
+        }
+      }
+    } else if (unhintedCount > 0) {
+      // No remaining space for unhinted columns — give them minimum width
+      for (size_t c = 0; c < numCols; ++c) {
+        if (colHintedWidth[c] <= 0) {
+          colWidths[c] = static_cast<uint16_t>(TABLE_MIN_COL_WIDTH);
+        }
+      }
+    }
+  }
+
+  // Compute column x-offsets (cumulative: border + padding + content width + padding + border ...)
+  std::vector<uint16_t> colXOffsets(numCols, 0);
+  int xAccum = TABLE_GRID_LINE_PX;  // start after left border
+  for (size_t c = 0; c < numCols; ++c) {
+    colXOffsets[c] = static_cast<uint16_t>(xAccum);
+    xAccum += TABLE_CELL_PAD_X + colWidths[c] + TABLE_CELL_PAD_X + TABLE_GRID_LINE_PX;
+  }
+  const int16_t totalTableWidth = static_cast<int16_t>(xAccum);
+
+  // Helper: compute the combined content width for a cell spanning multiple columns.
+  // This includes the content widths plus the internal grid lines and padding between spanned columns.
+  auto spanContentWidth = [&](size_t startCol, int colspan) -> uint16_t {
+    int width = 0;
+    for (int s = 0; s < colspan && startCol + s < numCols; ++s) {
+      width += colWidths[startCol + s];
+      if (s > 0) {
+        // Add internal padding and grid line between spanned columns
+        width += TABLE_CELL_PAD_X * 2 + TABLE_GRID_LINE_PX;
+      }
+    }
+    return static_cast<uint16_t>(std::max(width, 0));
+  };
+
+  // Helper: compute the full cell width (including padding on both sides) for a spanning cell.
+  auto spanFullCellWidth = [&](size_t startCol, int colspan) -> uint16_t {
+    if (colspan <= 0 || startCol >= numCols) return 0;
+    const size_t endCol = std::min(startCol + static_cast<size_t>(colspan), numCols) - 1;
+    // From the left edge of startCol's cell to the right edge of endCol's cell
+    const int leftEdge = colXOffsets[startCol];
+    const int rightEdge = colXOffsets[endCol] + TABLE_CELL_PAD_X + colWidths[endCol] + TABLE_CELL_PAD_X;
+    return static_cast<uint16_t>(rightEdge - leftEdge);
+  };
+
+  // 4. Lay out each row: map cells to logical columns, create PageTableRow
+  for (auto& row : tableData->rows) {
+    // Build cell data for this row, one entry per CELL (not per logical column).
+    // Each PageTableCellData gets the correct x-offset and combined column width.
+    std::vector<PageTableCellData> cellDataVec;
+    size_t maxLinesInRow = 1;
+    size_t logicalCol = 0;
+
+    for (size_t ci = 0; ci < row.cells.size() && logicalCol < numCols; ++ci) {
+      auto& cell = row.cells[ci];
+      const int cs = cell.colspan;
+
+      PageTableCellData cellData;
+      cellData.xOffset = colXOffsets[logicalCol];
+      cellData.columnWidth = spanFullCellWidth(logicalCol, cs);
+
+      if (cell.content && !cell.content->isEmpty()) {
+        // Center-align cells that span the full table width (common for section headers/titles)
+        if (cs >= static_cast<int>(numCols)) {
+          BlockStyle centeredStyle = cell.content->getBlockStyle();
+          centeredStyle.alignment = CssTextAlign::Center;
+          centeredStyle.textAlignDefined = true;
+          cell.content->setBlockStyle(centeredStyle);
+        }
+
+        const uint16_t contentWidth = spanContentWidth(logicalCol, cs);
+        std::vector<std::shared_ptr<TextBlock>> cellLines;
+
+        cell.content->layoutAndExtractLines(
+            renderer, fontId, contentWidth,
+            [&cellLines](const std::shared_ptr<TextBlock>& textBlock) { cellLines.push_back(textBlock); });
+
+        if (cellLines.size() > maxLinesInRow) {
+          maxLinesInRow = cellLines.size();
+        }
+        cellData.lines = std::move(cellLines);
+      }
+
+      cellDataVec.push_back(std::move(cellData));
+      logicalCol += static_cast<size_t>(cs);
+    }
+
+    // Fill remaining logical columns with empty cells (rows shorter than numCols)
+    while (logicalCol < numCols) {
+      PageTableCellData emptyCell;
+      emptyCell.xOffset = colXOffsets[logicalCol];
+      emptyCell.columnWidth = static_cast<uint16_t>(TABLE_CELL_PAD_X + colWidths[logicalCol] + TABLE_CELL_PAD_X);
+      cellDataVec.push_back(std::move(emptyCell));
+      logicalCol++;
+    }
+
+    // Row height = max lines * lineHeight + top/bottom border + asymmetric vertical padding
+    const int16_t rowHeight = static_cast<int16_t>(
+        static_cast<int>(maxLinesInRow) * lh + 2 + TABLE_CELL_PAD_TOP + TABLE_CELL_PAD_BOTTOM);
+
+    auto pageTableRow = std::make_shared<PageTableRow>(
+        std::move(cellDataVec), rowHeight, totalTableWidth, static_cast<int16_t>(lh), 0, 0);
+
+    addTableRowToPage(std::move(pageTableRow));
+  }
+
+  // Add a small gap after the table
+  if (extraParagraphSpacing) {
+    currentPageNextY += lh / 2;
+  }
+}

lib/Epub/Epub/parsers/ChapterHtmlSlimParser.h

@@ -7,11 +7,13 @@
 #include <memory>
 
 #include "../ParsedText.h"
+#include "../TableData.h"
 #include "../blocks/TextBlock.h"
 #include "../css/CssParser.h"
 #include "../css/CssStyle.h"
 
 class Page;
+class PageTableRow;
 class GfxRenderer;
 
 #define MAX_WORD_SIZE 200
@@ -57,10 +59,16 @@ class ChapterHtmlSlimParser {
   bool effectiveItalic = false;
   bool effectiveUnderline = false;
 
+  // Table buffering state
+  bool inTable = false;
+  std::unique_ptr<TableData> tableData;
+
   void updateEffectiveInlineStyle();
   void startNewTextBlock(const BlockStyle& blockStyle);
   void flushPartWordBuffer();
   void makePages();
+  void processTable();
+  void addTableRowToPage(std::shared_ptr<PageTableRow> row);
   // XML callbacks
   static void XMLCALL startElement(void* userData, const XML_Char* name, const XML_Char** atts);
   static void XMLCALL characterData(void* userData, const XML_Char* s, int len);

lib/PlaceholderCover/BookIcon.h

@@ -0,0 +1,27 @@
+#pragma once
+#include <cstdint>
+
+// Book icon: 48x48, 1-bit packed (MSB first)
+// 0 = black, 1 = white (same format as Logo120.h)
+static constexpr int BOOK_ICON_WIDTH = 48;
+static constexpr int BOOK_ICON_HEIGHT = 48;
+static const uint8_t BookIcon[] = {
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00,
+    0x00, 0x1f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f,
+    0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f,
+    0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff,
+    0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1c, 0x00, 0x00, 0x01, 0x9f, 0xfc, 0x1f,
+    0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f,
+    0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1c, 0x00, 0x01,
+    0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f,
+    0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f,
+    0xfc, 0x1c, 0x00, 0x00, 0x1f, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff,
+    0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f,
+    0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f,
+    0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff,
+    0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f,
+    0xff, 0xff, 0xff, 0x9f, 0xfc, 0x1f, 0xff, 0xff, 0xff, 0x9f, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x1f,
+    0xfc, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xff, 0x00, 0x00, 0x00,
+    0x00, 0x3f, 0xff, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xff, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+};

lib/PlaceholderCover/PlaceholderCoverGenerator.cpp

@@ -0,0 +1,480 @@
+#include "PlaceholderCoverGenerator.h"
+
+#include <EpdFont.h>
+#include <HalStorage.h>
+#include <Logging.h>
+#include <Utf8.h>
+
+#include <algorithm>
+#include <cstring>
+#include <vector>
+
+// Include the UI fonts directly for self-contained placeholder rendering.
+// These are 1-bit bitmap fonts compiled from Ubuntu TTF.
+#include "builtinFonts/ubuntu_10_regular.h"
+#include "builtinFonts/ubuntu_12_bold.h"
+
+// Book icon bitmap (48x48 1-bit, generated by scripts/generate_book_icon.py)
+#include "BookIcon.h"
+
+namespace {
+
+// BMP writing helpers (same format as JpegToBmpConverter)
+inline void write16(Print& out, const uint16_t value) {
+  out.write(value & 0xFF);
+  out.write((value >> 8) & 0xFF);
+}
+
+inline void write32(Print& out, const uint32_t value) {
+  out.write(value & 0xFF);
+  out.write((value >> 8) & 0xFF);
+  out.write((value >> 16) & 0xFF);
+  out.write((value >> 24) & 0xFF);
+}
+
+inline void write32Signed(Print& out, const int32_t value) {
+  out.write(value & 0xFF);
+  out.write((value >> 8) & 0xFF);
+  out.write((value >> 16) & 0xFF);
+  out.write((value >> 24) & 0xFF);
+}
+
+void writeBmpHeader1bit(Print& bmpOut, const int width, const int height) {
+  const int bytesPerRow = (width + 31) / 32 * 4;
+  const int imageSize = bytesPerRow * height;
+  const uint32_t fileSize = 62 + imageSize;
+
+  // BMP File Header (14 bytes)
+  bmpOut.write('B');
+  bmpOut.write('M');
+  write32(bmpOut, fileSize);
+  write32(bmpOut, 0);   // Reserved
+  write32(bmpOut, 62);  // Offset to pixel data
+
+  // DIB Header (BITMAPINFOHEADER - 40 bytes)
+  write32(bmpOut, 40);
+  write32Signed(bmpOut, width);
+  write32Signed(bmpOut, -height);  // Negative = top-down
+  write16(bmpOut, 1);              // Color planes
+  write16(bmpOut, 1);              // Bits per pixel
+  write32(bmpOut, 0);              // BI_RGB
+  write32(bmpOut, imageSize);
+  write32(bmpOut, 2835);  // xPixelsPerMeter
+  write32(bmpOut, 2835);  // yPixelsPerMeter
+  write32(bmpOut, 2);     // colorsUsed
+  write32(bmpOut, 2);     // colorsImportant
+
+  // Palette: index 0 = black, index 1 = white
+  const uint8_t palette[8] = {
+      0x00, 0x00, 0x00, 0x00,  // Black
+      0xFF, 0xFF, 0xFF, 0x00   // White
+  };
+  for (const uint8_t b : palette) {
+    bmpOut.write(b);
+  }
+}
+
+/// 1-bit pixel buffer that can render text, icons, and shapes, then write as BMP.
+class PixelBuffer {
+ public:
+  PixelBuffer(int width, int height) : width(width), height(height) {
+    bytesPerRow = (width + 31) / 32 * 4;
+    bufferSize = bytesPerRow * height;
+    buffer = static_cast<uint8_t*>(malloc(bufferSize));
+    if (buffer) {
+      memset(buffer, 0xFF, bufferSize);  // White background
+    }
+  }
+
+  ~PixelBuffer() {
+    if (buffer) {
+      free(buffer);
+    }
+  }
+
+  bool isValid() const { return buffer != nullptr; }
+
+  /// Set a pixel to black.
+  void setBlack(int x, int y) {
+    if (x < 0 || x >= width || y < 0 || y >= height) return;
+    const int byteIndex = y * bytesPerRow + x / 8;
+    const uint8_t bitMask = 0x80 >> (x % 8);
+    buffer[byteIndex] &= ~bitMask;
+  }
+
+  /// Set a scaled "pixel" (scale x scale block) to black.
+  void setBlackScaled(int x, int y, int scale) {
+    for (int dy = 0; dy < scale; dy++) {
+      for (int dx = 0; dx < scale; dx++) {
+        setBlack(x + dx, y + dy);
+      }
+    }
+  }
+
+  /// Draw a filled rectangle in black.
+  void fillRect(int x, int y, int w, int h) {
+    for (int row = y; row < y + h && row < height; row++) {
+      for (int col = x; col < x + w && col < width; col++) {
+        setBlack(col, row);
+      }
+    }
+  }
+
+  /// Draw a rectangular border in black.
+  void drawBorder(int x, int y, int w, int h, int thickness) {
+    fillRect(x, y, w, thickness);                  // Top
+    fillRect(x, y + h - thickness, w, thickness);   // Bottom
+    fillRect(x, y, thickness, h);                   // Left
+    fillRect(x + w - thickness, y, thickness, h);   // Right
+  }
+
+  /// Draw a horizontal line in black with configurable thickness.
+  void drawHLine(int x, int y, int length, int thickness = 1) {
+    fillRect(x, y, length, thickness);
+  }
+
+  /// Render a single glyph at (cursorX, baselineY) with integer scaling. Returns advance in X (scaled).
+  int renderGlyph(const EpdFontData* font, uint32_t codepoint, int cursorX, int baselineY, int scale = 1) {
+    const EpdFont fontObj(font);
+    const EpdGlyph* glyph = fontObj.getGlyph(codepoint);
+    if (!glyph) {
+      glyph = fontObj.getGlyph(REPLACEMENT_GLYPH);
+    }
+    if (!glyph) {
+      return 0;
+    }
+
+    const uint8_t* bitmap = &font->bitmap[glyph->dataOffset];
+    const int glyphW = glyph->width;
+    const int glyphH = glyph->height;
+
+    for (int gy = 0; gy < glyphH; gy++) {
+      const int screenY = baselineY - glyph->top * scale + gy * scale;
+      for (int gx = 0; gx < glyphW; gx++) {
+        const int pixelPos = gy * glyphW + gx;
+        const int screenX = cursorX + glyph->left * scale + gx * scale;
+
+        bool isSet = false;
+        if (font->is2Bit) {
+          const uint8_t byte = bitmap[pixelPos / 4];
+          const uint8_t bitIndex = (3 - pixelPos % 4) * 2;
+          const uint8_t val = 3 - ((byte >> bitIndex) & 0x3);
+          isSet = (val < 3);
+        } else {
+          const uint8_t byte = bitmap[pixelPos / 8];
+          const uint8_t bitIndex = 7 - (pixelPos % 8);
+          isSet = ((byte >> bitIndex) & 1);
+        }
+
+        if (isSet) {
+          setBlackScaled(screenX, screenY, scale);
+        }
+      }
+    }
+
+    return glyph->advanceX * scale;
+  }
+
+  /// Render a UTF-8 string at (x, y) where y is the top of the text line, with integer scaling.
+  void drawText(const EpdFontData* font, int x, int y, const char* text, int scale = 1) {
+    const int baselineY = y + font->ascender * scale;
+    int cursorX = x;
+    uint32_t cp;
+    while ((cp = utf8NextCodepoint(reinterpret_cast<const uint8_t**>(&text)))) {
+      cursorX += renderGlyph(font, cp, cursorX, baselineY, scale);
+    }
+  }
+
+  /// Draw a 1-bit icon bitmap (MSB first, 0=black, 1=white) with integer scaling.
+  void drawIcon(const uint8_t* icon, int iconW, int iconH, int x, int y, int scale = 1) {
+    const int bytesPerIconRow = iconW / 8;
+    for (int iy = 0; iy < iconH; iy++) {
+      for (int ix = 0; ix < iconW; ix++) {
+        const int byteIdx = iy * bytesPerIconRow + ix / 8;
+        const uint8_t bitMask = 0x80 >> (ix % 8);
+        // In the icon data: 0 = black (drawn), 1 = white (skip)
+        if (!(icon[byteIdx] & bitMask)) {
+          const int sx = x + ix * scale;
+          const int sy = y + iy * scale;
+          setBlackScaled(sx, sy, scale);
+        }
+      }
+    }
+  }
+
+  /// Write the pixel buffer to a file as a 1-bit BMP.
+  bool writeBmp(Print& out) const {
+    if (!buffer) return false;
+    writeBmpHeader1bit(out, width, height);
+    out.write(buffer, bufferSize);
+    return true;
+  }
+
+  int getWidth() const { return width; }
+  int getHeight() const { return height; }
+
+ private:
+  int width;
+  int height;
+  int bytesPerRow;
+  size_t bufferSize;
+  uint8_t* buffer;
+};
+
+/// Measure the width of a UTF-8 string in pixels (at 1x scale).
+int measureTextWidth(const EpdFontData* font, const char* text) {
+  const EpdFont fontObj(font);
+  int w = 0, h = 0;
+  fontObj.getTextDimensions(text, &w, &h);
+  return w;
+}
+
+/// Get the advance width of a single character.
+int getCharAdvance(const EpdFontData* font, uint32_t cp) {
+  const EpdFont fontObj(font);
+  const EpdGlyph* glyph = fontObj.getGlyph(cp);
+  if (!glyph) return 0;
+  return glyph->advanceX;
+}
+
+/// Split a string into words (splitting on spaces).
+std::vector<std::string> splitWords(const std::string& text) {
+  std::vector<std::string> words;
+  std::string current;
+  for (size_t i = 0; i < text.size(); i++) {
+    if (text[i] == ' ') {
+      if (!current.empty()) {
+        words.push_back(current);
+        current.clear();
+      }
+    } else {
+      current += text[i];
+    }
+  }
+  if (!current.empty()) {
+    words.push_back(current);
+  }
+  return words;
+}
+
+/// Word-wrap text into lines that fit within maxWidth pixels at the given scale.
+std::vector<std::string> wrapText(const EpdFontData* font, const std::string& text, int maxWidth, int scale = 1) {
+  std::vector<std::string> lines;
+  const auto words = splitWords(text);
+  if (words.empty()) return lines;
+
+  const int spaceWidth = getCharAdvance(font, ' ') * scale;
+  std::string currentLine;
+  int currentWidth = 0;
+
+  for (const auto& word : words) {
+    const int wordWidth = measureTextWidth(font, word.c_str()) * scale;
+
+    if (currentLine.empty()) {
+      currentLine = word;
+      currentWidth = wordWidth;
+    } else if (currentWidth + spaceWidth + wordWidth <= maxWidth) {
+      currentLine += " " + word;
+      currentWidth += spaceWidth + wordWidth;
+    } else {
+      lines.push_back(currentLine);
+      currentLine = word;
+      currentWidth = wordWidth;
+    }
+  }
+
+  if (!currentLine.empty()) {
+    lines.push_back(currentLine);
+  }
+
+  return lines;
+}
+
+/// Truncate a string with "..." if it exceeds maxWidth pixels at the given scale.
+std::string truncateText(const EpdFontData* font, const std::string& text, int maxWidth, int scale = 1) {
+  if (measureTextWidth(font, text.c_str()) * scale <= maxWidth) {
+    return text;
+  }
+
+  std::string truncated = text;
+  const char* ellipsis = "...";
+  const int ellipsisWidth = measureTextWidth(font, ellipsis) * scale;
+
+  while (!truncated.empty()) {
+    utf8RemoveLastChar(truncated);
+    if (measureTextWidth(font, truncated.c_str()) * scale + ellipsisWidth <= maxWidth) {
+      return truncated + ellipsis;
+    }
+  }
+
+  return ellipsis;
+}
+
+}  // namespace
+
+bool PlaceholderCoverGenerator::generate(const std::string& outputPath, const std::string& title,
+                                         const std::string& author, int width, int height) {
+  LOG_DBG("PHC", "Generating placeholder cover %dx%d: \"%s\" by \"%s\"", width, height, title.c_str(), author.c_str());
+
+  const EpdFontData* titleFont = &ubuntu_12_bold;
+  const EpdFontData* authorFont = &ubuntu_10_regular;
+
+  PixelBuffer buf(width, height);
+  if (!buf.isValid()) {
+    LOG_ERR("PHC", "Failed to allocate %dx%d pixel buffer (%d bytes)", width, height,
+            (width + 31) / 32 * 4 * height);
+    return false;
+  }
+
+  // Proportional layout constants based on cover dimensions.
+  // The device bezel covers ~2-3px on each edge, so we pad inward from the edge.
+  const int edgePadding = std::max(3, width / 48);    // ~10px at 480w, ~3px at 136w
+  const int borderWidth = std::max(2, width / 96);     // ~5px at 480w, ~2px at 136w
+  const int innerPadding = std::max(4, width / 32);    // ~15px at 480w, ~4px at 136w
+
+  // Text scaling: 2x for full-size covers, 1x for thumbnails
+  const int titleScale = (height >= 600) ? 2 : 1;
+  const int authorScale = (height >= 600) ? 2 : 1;  // Author also larger on full covers
+  // Icon: 2x for full cover, 1x for medium thumb, skip for small
+  const int iconScale = (height >= 600) ? 2 : (height >= 350 ? 1 : 0);
+
+  // Draw border inset from edge
+  buf.drawBorder(edgePadding, edgePadding, width - 2 * edgePadding, height - 2 * edgePadding, borderWidth);
+
+  // Content area (inside border + inner padding)
+  const int contentX = edgePadding + borderWidth + innerPadding;
+  const int contentY = edgePadding + borderWidth + innerPadding;
+  const int contentW = width - 2 * contentX;
+  const int contentH = height - 2 * contentY;
+
+  if (contentW <= 0 || contentH <= 0) {
+    LOG_ERR("PHC", "Cover too small for content (%dx%d)", width, height);
+    FsFile file;
+    if (!Storage.openFileForWrite("PHC", outputPath, file)) {
+      return false;
+    }
+    buf.writeBmp(file);
+    file.close();
+    return true;
+  }
+
+  // --- Layout zones ---
+  // Title zone: top 2/3 of content area (icon + title)
+  // Author zone: bottom 1/3 of content area
+  const int titleZoneH = contentH * 2 / 3;
+  const int authorZoneH = contentH - titleZoneH;
+  const int authorZoneY = contentY + titleZoneH;
+
+  // --- Separator line at the zone boundary ---
+  const int separatorWidth = contentW / 3;
+  const int separatorX = contentX + (contentW - separatorWidth) / 2;
+  buf.drawHLine(separatorX, authorZoneY, separatorWidth);
+
+  // --- Icon dimensions (needed for title text wrapping) ---
+  const int iconW = (iconScale > 0) ? BOOK_ICON_WIDTH * iconScale : 0;
+  const int iconGap = (iconScale > 0) ? std::max(8, width / 40) : 0;  // Gap between icon and title text
+  const int titleTextW = contentW - iconW - iconGap;  // Title wraps in narrower area beside icon
+
+  // --- Prepare title text (wraps within the area to the right of the icon) ---
+  const std::string displayTitle = title.empty() ? "Untitled" : title;
+  auto titleLines = wrapText(titleFont, displayTitle, titleTextW, titleScale);
+
+  constexpr int MAX_TITLE_LINES = 5;
+  if (static_cast<int>(titleLines.size()) > MAX_TITLE_LINES) {
+    titleLines.resize(MAX_TITLE_LINES);
+    titleLines.back() = truncateText(titleFont, titleLines.back(), titleTextW, titleScale);
+  }
+
+  // --- Prepare author text (multi-line, max 3 lines) ---
+  std::vector<std::string> authorLines;
+  if (!author.empty()) {
+    authorLines = wrapText(authorFont, author, contentW, authorScale);
+    constexpr int MAX_AUTHOR_LINES = 3;
+    if (static_cast<int>(authorLines.size()) > MAX_AUTHOR_LINES) {
+      authorLines.resize(MAX_AUTHOR_LINES);
+      authorLines.back() = truncateText(authorFont, authorLines.back(), contentW, authorScale);
+    }
+  }
+
+  // --- Calculate title zone layout (icon LEFT of title) ---
+  // Tighter line spacing so 2-3 title lines fit within the icon height
+  const int titleLineH = titleFont->advanceY * titleScale * 3 / 4;
+  const int iconH = (iconScale > 0) ? BOOK_ICON_HEIGHT * iconScale : 0;
+  const int numTitleLines = static_cast<int>(titleLines.size());
+  // Visual height: distance from top of first line to bottom of last line's glyphs.
+  // Use ascender (not full advanceY) for the last line since trailing line-gap isn't visible.
+  const int titleVisualH = (numTitleLines > 0)
+                               ? (numTitleLines - 1) * titleLineH + titleFont->ascender * titleScale
+                               : 0;
+  const int titleBlockH = std::max(iconH, titleVisualH);  // Taller of icon or text
+
+  int titleStartY = contentY + (titleZoneH - titleBlockH) / 2;
+  if (titleStartY < contentY) {
+    titleStartY = contentY;
+  }
+
+  // If title fits within icon height, center it vertically against the icon.
+  // Otherwise top-align so extra lines overflow below.
+  const int iconY = titleStartY;
+  const int titleTextY = (iconH > 0 && titleVisualH <= iconH)
+                             ? titleStartY + (iconH - titleVisualH) / 2
+                             : titleStartY;
+
+  // --- Horizontal centering: measure the widest title line, then center icon+gap+text block ---
+  int maxTitleLineW = 0;
+  for (const auto& line : titleLines) {
+    const int w = measureTextWidth(titleFont, line.c_str()) * titleScale;
+    if (w > maxTitleLineW) maxTitleLineW = w;
+  }
+  const int titleBlockW = iconW + iconGap + maxTitleLineW;
+  const int titleBlockX = contentX + (contentW - titleBlockW) / 2;
+
+  // --- Draw icon ---
+  if (iconScale > 0) {
+    buf.drawIcon(BookIcon, BOOK_ICON_WIDTH, BOOK_ICON_HEIGHT, titleBlockX, iconY, iconScale);
+  }
+
+  // --- Draw title lines (to the right of the icon) ---
+  const int titleTextX = titleBlockX + iconW + iconGap;
+  int currentY = titleTextY;
+  for (const auto& line : titleLines) {
+    buf.drawText(titleFont, titleTextX, currentY, line.c_str(), titleScale);
+    currentY += titleLineH;
+  }
+
+  // --- Draw author lines (centered vertically in bottom 1/3, centered horizontally) ---
+  if (!authorLines.empty()) {
+    const int authorLineH = authorFont->advanceY * authorScale;
+    const int authorBlockH = static_cast<int>(authorLines.size()) * authorLineH;
+    int authorStartY = authorZoneY + (authorZoneH - authorBlockH) / 2;
+    if (authorStartY < authorZoneY + 4) {
+      authorStartY = authorZoneY + 4;  // Small gap below separator
+    }
+
+    for (const auto& line : authorLines) {
+      const int lineWidth = measureTextWidth(authorFont, line.c_str()) * authorScale;
+      const int lineX = contentX + (contentW - lineWidth) / 2;
+      buf.drawText(authorFont, lineX, authorStartY, line.c_str(), authorScale);
+      authorStartY += authorLineH;
+    }
+  }
+
+  // --- Write to file ---
+  FsFile file;
+  if (!Storage.openFileForWrite("PHC", outputPath, file)) {
+    LOG_ERR("PHC", "Failed to open output file: %s", outputPath.c_str());
+    return false;
+  }
+
+  const bool success = buf.writeBmp(file);
+  file.close();
+
+  if (success) {
+    LOG_DBG("PHC", "Placeholder cover written to %s", outputPath.c_str());
+  } else {
+    LOG_ERR("PHC", "Failed to write placeholder BMP");
+    Storage.remove(outputPath.c_str());
+  }
+
+  return success;
+}

lib/PlaceholderCover/PlaceholderCoverGenerator.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <string>
+
+/// Generates simple 1-bit BMP placeholder covers with title/author text
+/// for books that have no embedded cover image.
+class PlaceholderCoverGenerator {
+ public:
+  /// Generate a placeholder cover BMP with title and author text.
+  /// The BMP is written to outputPath as a 1-bit black-and-white image.
+  /// Returns true if the file was written successfully.
+  static bool generate(const std::string& outputPath, const std::string& title, const std::string& author, int width,
+                       int height);
+};

lib/Txt/Txt.cpp

@@ -97,6 +97,9 @@ std::string Txt::findCoverImage() const {
 
 std::string Txt::getCoverBmpPath() const { return cachePath + "/cover.bmp"; }
 
+std::string Txt::getThumbBmpPath() const { return cachePath + "/thumb_[HEIGHT].bmp"; }
+std::string Txt::getThumbBmpPath(int height) const { return cachePath + "/thumb_" + std::to_string(height) + ".bmp"; }
+
 bool Txt::generateCoverBmp() const {
   // Already generated, return true
   if (Storage.exists(getCoverBmpPath().c_str())) {

lib/Txt/Txt.h

@@ -28,6 +28,10 @@ class Txt {
   [[nodiscard]] bool generateCoverBmp() const;
   [[nodiscard]] std::string findCoverImage() const;
 
+  // Thumbnail paths (matching Epub/Xtc pattern for home screen covers)
+  [[nodiscard]] std::string getThumbBmpPath() const;
+  [[nodiscard]] std::string getThumbBmpPath(int height) const;
+
   // Read content from file
   [[nodiscard]] bool readContent(uint8_t* buffer, size_t offset, size_t length) const;
 };

lib/hal/HalPowerManager.cpp

@@ -17,14 +17,14 @@ void HalPowerManager::setPowerSaving(bool enabled) {
   if (enabled && !isLowPower) {
     LOG_DBG("PWR", "Going to low-power mode");
     if (!setCpuFrequencyMhz(LOW_POWER_FREQ)) {
-      LOG_ERR("PWR", "Failed to set low-power CPU frequency");
+      LOG_DBG("PWR", "Failed to set CPU frequency = %d MHz", LOW_POWER_FREQ);
       return;
     }
   }
   if (!enabled && isLowPower) {
     LOG_DBG("PWR", "Restoring normal CPU frequency");
     if (!setCpuFrequencyMhz(normalFreq)) {
-      LOG_ERR("PWR", "Failed to restore normal CPU frequency");
+      LOG_DBG("PWR", "Failed to set CPU frequency = %d MHz", normalFreq);
       return;
     }
   }

platformio.ini

@@ -65,6 +65,12 @@ extra_scripts =
   pre:scripts/inject_mod_version.py
 build_flags =
   ${base.build_flags}
+  -DOMIT_OPENDYSLEXIC
+  -DOMIT_HYPH_DE
+  -DOMIT_HYPH_ES
+  -DOMIT_HYPH_FR
+  -DOMIT_HYPH_IT
+  -DOMIT_HYPH_RU
   -DENABLE_SERIAL_LOG
   -DLOG_LEVEL=2 ; Set log level to debug for mod builds
 

scripts/generate_book_icon.py

@@ -0,0 +1,123 @@
+#!/usr/bin/env python3
+"""Generate a 1-bit book icon bitmap as a C header for PlaceholderCoverGenerator.
+
+The icon is a simplified closed book with a spine on the left and 3 text lines.
+Output format matches Logo120.h: MSB-first packed 1-bit, 0=black, 1=white.
+"""
+
+from PIL import Image, ImageDraw
+import sys
+
+
+def generate_book_icon(size=48):
+    """Create a book icon at the given size."""
+    img = Image.new("1", (size, size), 1)  # White background
+    draw = ImageDraw.Draw(img)
+
+    # Scale helper
+    s = size / 48.0
+
+    # Book body (main rectangle, leaving room for spine and pages)
+    body_left = int(6 * s)
+    body_top = int(2 * s)
+    body_right = int(42 * s)
+    body_bottom = int(40 * s)
+
+    # Draw book body outline (2px thick)
+    for i in range(int(2 * s)):
+        draw.rectangle(
+            [body_left + i, body_top + i, body_right - i, body_bottom - i], outline=0
+        )
+
+    # Spine (thicker left edge)
+    spine_width = int(4 * s)
+    draw.rectangle([body_left, body_top, body_left + spine_width, body_bottom], fill=0)
+
+    # Pages at the bottom (slight offset from body)
+    pages_top = body_bottom
+    pages_bottom = int(44 * s)
+    draw.rectangle(
+        [body_left + int(2 * s), pages_top, body_right - int(1 * s), pages_bottom],
+        outline=0,
+    )
+    # Page edges (a few lines)
+    for i in range(3):
+        y = pages_top + int((i + 1) * 1 * s)
+        if y < pages_bottom:
+            draw.line(
+                [body_left + int(3 * s), y, body_right - int(2 * s), y], fill=0
+            )
+
+    # Text lines on the book cover
+    text_left = body_left + spine_width + int(4 * s)
+    text_right = body_right - int(4 * s)
+    line_thickness = max(1, int(1.5 * s))
+
+    text_lines_y = [int(12 * s), int(18 * s), int(24 * s)]
+    text_widths = [1.0, 0.7, 0.85]  # Relative widths for visual interest
+
+    for y, w_ratio in zip(text_lines_y, text_widths):
+        line_right = text_left + int((text_right - text_left) * w_ratio)
+        for t in range(line_thickness):
+            draw.line([text_left, y + t, line_right, y + t], fill=0)
+
+    return img
+
+
+def image_to_c_array(img, name="BookIcon"):
+    """Convert a 1-bit PIL image to a C header array."""
+    width, height = img.size
+    pixels = img.load()
+
+    bytes_per_row = width // 8
+    data = []
+
+    for y in range(height):
+        for bx in range(bytes_per_row):
+            byte = 0
+            for bit in range(8):
+                x = bx * 8 + bit
+                if x < width:
+                    # 1 = white, 0 = black (matching Logo120.h convention)
+                    if pixels[x, y]:
+                        byte |= 1 << (7 - bit)
+            data.append(byte)
+
+    # Format as C header
+    lines = []
+    lines.append("#pragma once")
+    lines.append("#include <cstdint>")
+    lines.append("")
+    lines.append(f"// Book icon: {width}x{height}, 1-bit packed (MSB first)")
+    lines.append(f"// 0 = black, 1 = white (same format as Logo120.h)")
+    lines.append(f"static constexpr int BOOK_ICON_WIDTH = {width};")
+    lines.append(f"static constexpr int BOOK_ICON_HEIGHT = {height};")
+    lines.append(f"static const uint8_t {name}[] = {{")
+
+    # Format data in rows of 16 bytes
+    for i in range(0, len(data), 16):
+        chunk = data[i : i + 16]
+        hex_str = ", ".join(f"0x{b:02x}" for b in chunk)
+        lines.append(f"    {hex_str},")
+
+    lines.append("};")
+    lines.append("")
+
+    return "\n".join(lines)
+
+
+if __name__ == "__main__":
+    size = int(sys.argv[1]) if len(sys.argv) > 1 else 48
+    img = generate_book_icon(size)
+
+    # Save preview PNG
+    preview_path = f"mod/book_icon_{size}x{size}.png"
+    img.resize((size * 4, size * 4), Image.NEAREST).save(preview_path)
+    print(f"Preview saved to {preview_path}", file=sys.stderr)
+
+    # Generate C header
+    header = image_to_c_array(img, "BookIcon")
+    output_path = "lib/PlaceholderCover/BookIcon.h"
+    with open(output_path, "w") as f:
+        f.write(header)
+    print(f"C header saved to {output_path}", file=sys.stderr)

scripts/preview_placeholder_cover.py

@@ -0,0 +1,179 @@
+#!/usr/bin/env python3
+"""Generate a preview of the placeholder cover layout at full cover size (480x800).
+This mirrors the C++ PlaceholderCoverGenerator layout logic for visual verification.
+"""
+
+from PIL import Image, ImageDraw, ImageFont
+import sys
+import os
+
+# Reuse the book icon generator
+sys.path.insert(0, os.path.dirname(__file__))
+from generate_book_icon import generate_book_icon
+
+
+def create_preview(width=480, height=800, title="The Great Gatsby", author="F. Scott Fitzgerald"):
+    img = Image.new("1", (width, height), 1)  # White
+    draw = ImageDraw.Draw(img)
+
+    # Proportional layout constants
+    edge_padding = max(3, width // 48)      # ~10px at 480w
+    border_width = max(2, width // 96)      # ~5px at 480w
+    inner_padding = max(4, width // 32)     # ~15px at 480w
+
+    title_scale = 2 if height >= 600 else 1
+    author_scale = 2 if height >= 600 else 1  # Author also larger on full covers
+    icon_scale = 2 if height >= 600 else (1 if height >= 350 else 0)
+
+    # Draw border inset from edge
+    bx = edge_padding
+    by = edge_padding
+    bw = width - 2 * edge_padding
+    bh = height - 2 * edge_padding
+    for i in range(border_width):
+        draw.rectangle([bx + i, by + i, bx + bw - 1 - i, by + bh - 1 - i], outline=0)
+
+    # Content area
+    content_x = edge_padding + border_width + inner_padding
+    content_y = edge_padding + border_width + inner_padding
+    content_w = width - 2 * content_x
+    content_h = height - 2 * content_y
+
+    # Zones
+    title_zone_h = content_h * 2 // 3
+    author_zone_h = content_h - title_zone_h
+    author_zone_y = content_y + title_zone_h
+
+    # Separator
+    sep_w = content_w // 3
+    sep_x = content_x + (content_w - sep_w) // 2
+    draw.line([sep_x, author_zone_y, sep_x + sep_w, author_zone_y], fill=0)
+
+    # Use a basic font for the preview (won't match exact Ubuntu metrics, but shows layout)
+    try:
+        title_font = ImageFont.truetype("/System/Library/Fonts/Helvetica.ttc", 12 * title_scale)
+        author_font = ImageFont.truetype("/System/Library/Fonts/Helvetica.ttc", 10 * author_scale)
+    except (OSError, IOError):
+        title_font = ImageFont.load_default()
+        author_font = ImageFont.load_default()
+
+    # Icon dimensions (needed for title text wrapping)
+    icon_w_px = 48 * icon_scale if icon_scale > 0 else 0
+    icon_h_px = 48 * icon_scale if icon_scale > 0 else 0
+    icon_gap = max(8, width // 40) if icon_scale > 0 else 0
+    title_text_w = content_w - icon_w_px - icon_gap  # Title wraps in narrower area beside icon
+
+    # Wrap title (within the narrower area to the right of the icon)
+    title_lines = []
+    words = title.split()
+    current_line = ""
+    for word in words:
+        test = f"{current_line} {word}".strip()
+        bbox = draw.textbbox((0, 0), test, font=title_font)
+        if bbox[2] - bbox[0] <= title_text_w:
+            current_line = test
+        else:
+            if current_line:
+                title_lines.append(current_line)
+            current_line = word
+    if current_line:
+        title_lines.append(current_line)
+    title_lines = title_lines[:5]
+
+    # Line spacing: 75% of advanceY (tighter so 2-3 lines fit within icon height)
+    title_line_h = 29 * title_scale * 3 // 4  # Based on C++ ubuntu_12_bold advanceY
+
+    # Measure actual single-line height from the PIL font for accurate centering
+    sample_bbox = draw.textbbox((0, 0), "Ag", font=title_font)  # Tall + descender chars
+    single_line_visual_h = sample_bbox[3] - sample_bbox[1]
+
+    # Visual height: line spacing between lines + actual height of last line's glyphs
+    num_title_lines = len(title_lines)
+    title_visual_h = (num_title_lines - 1) * title_line_h + single_line_visual_h if num_title_lines > 0 else 0
+    title_block_h = max(icon_h_px, title_visual_h)
+
+    title_start_y = content_y + (title_zone_h - title_block_h) // 2
+    if title_start_y < content_y:
+        title_start_y = content_y
+
+    # If title fits within icon height, center it vertically against the icon.
+    # Otherwise top-align so extra lines overflow below.
+    icon_y = title_start_y
+    if icon_h_px > 0 and title_visual_h <= icon_h_px:
+        title_text_y = title_start_y + (icon_h_px - title_visual_h) // 2
+    else:
+        title_text_y = title_start_y
+
+    # Horizontal centering: measure widest title line, center icon+gap+text block
+    max_title_line_w = 0
+    for line in title_lines:
+        bbox = draw.textbbox((0, 0), line, font=title_font)
+        w = bbox[2] - bbox[0]
+        if w > max_title_line_w:
+            max_title_line_w = w
+    title_block_w = icon_w_px + icon_gap + max_title_line_w
+    title_block_x = content_x + (content_w - title_block_w) // 2
+
+    # Draw icon
+    if icon_scale > 0:
+        icon_img = generate_book_icon(48)
+        scaled_icon = icon_img.resize((icon_w_px, icon_h_px), Image.NEAREST)
+        for iy in range(scaled_icon.height):
+            for ix in range(scaled_icon.width):
+                if not scaled_icon.getpixel((ix, iy)):
+                    img.putpixel((title_block_x + ix, icon_y + iy), 0)
+
+    # Draw title (to the right of the icon)
+    title_text_x = title_block_x + icon_w_px + icon_gap
+    current_y = title_text_y
+    for line in title_lines:
+        draw.text((title_text_x, current_y), line, fill=0, font=title_font)
+        current_y += title_line_h
+
+    # Wrap author
+    author_lines = []
+    words = author.split()
+    current_line = ""
+    for word in words:
+        test = f"{current_line} {word}".strip()
+        bbox = draw.textbbox((0, 0), test, font=author_font)
+        if bbox[2] - bbox[0] <= content_w:
+            current_line = test
+        else:
+            if current_line:
+                author_lines.append(current_line)
+            current_line = word
+    if current_line:
+        author_lines.append(current_line)
+    author_lines = author_lines[:3]
+
+    # Draw author centered in bottom 1/3
+    author_line_h = 24 * author_scale  # Ubuntu 10 regular advanceY ~24
+    author_block_h = len(author_lines) * author_line_h
+    author_start_y = author_zone_y + (author_zone_h - author_block_h) // 2
+
+    for line in author_lines:
+        bbox = draw.textbbox((0, 0), line, font=author_font)
+        line_w = bbox[2] - bbox[0]
+        line_x = content_x + (content_w - line_w) // 2
+        draw.text((line_x, author_start_y), line, fill=0, font=author_font)
+        author_start_y += author_line_h
+
+    return img
+
+
+if __name__ == "__main__":
+    # Full cover
+    img = create_preview(480, 800, "A Really Long Book Title That Should Wrap", "Jane Doe")
+    img.save("mod/preview_cover_480x800.png")
+    print("Saved mod/preview_cover_480x800.png", file=sys.stderr)
+
+    # Medium thumbnail
+    img2 = create_preview(240, 400, "A Really Long Book Title That Should Wrap", "Jane Doe")
+    img2.save("mod/preview_thumb_240x400.png")
+    print("Saved mod/preview_thumb_240x400.png", file=sys.stderr)
+
+    # Small thumbnail
+    img3 = create_preview(136, 226, "A Really Long Book Title", "Jane Doe")
+    img3.save("mod/preview_thumb_136x226.png")
+    print("Saved mod/preview_thumb_136x226.png", file=sys.stderr)

src/CrossPointSettings.cpp

@@ -244,8 +244,8 @@ bool CrossPointSettings::loadFromFile() {
 
 float CrossPointSettings::getReaderLineCompression() const {
   switch (fontFamily) {
+#ifndef OMIT_BOOKERLY
     case BOOKERLY:
-    default:
       switch (lineSpacing) {
         case TIGHT:
           return 0.95f;
@@ -255,6 +255,8 @@ float CrossPointSettings::getReaderLineCompression() const {
         case WIDE:
           return 1.1f;
       }
+#endif  // OMIT_BOOKERLY
+#ifndef OMIT_NOTOSANS
     case NOTOSANS:
       switch (lineSpacing) {
         case TIGHT:
@@ -265,6 +267,8 @@ float CrossPointSettings::getReaderLineCompression() const {
         case WIDE:
           return 1.0f;
       }
+#endif  // OMIT_NOTOSANS
+#ifndef OMIT_OPENDYSLEXIC
     case OPENDYSLEXIC:
       switch (lineSpacing) {
         case TIGHT:
@@ -275,6 +279,30 @@ float CrossPointSettings::getReaderLineCompression() const {
         case WIDE:
           return 1.0f;
       }
+#endif  // OMIT_OPENDYSLEXIC
+    default:
+      // Fallback: use Bookerly-style compression, or Noto Sans if Bookerly is omitted
+#if !defined(OMIT_BOOKERLY)
+      switch (lineSpacing) {
+        case TIGHT:
+          return 0.95f;
+        case NORMAL:
+        default:
+          return 1.0f;
+        case WIDE:
+          return 1.1f;
+      }
+#else
+      switch (lineSpacing) {
+        case TIGHT:
+          return 0.90f;
+        case NORMAL:
+        default:
+          return 0.95f;
+        case WIDE:
+          return 1.0f;
+      }
+#endif
   }
 }
 
@@ -312,8 +340,8 @@ int CrossPointSettings::getRefreshFrequency() const {
 
 int CrossPointSettings::getReaderFontId() const {
   switch (fontFamily) {
+#ifndef OMIT_BOOKERLY
     case BOOKERLY:
-    default:
       switch (fontSize) {
         case SMALL:
           return BOOKERLY_12_FONT_ID;
@@ -325,6 +353,8 @@ int CrossPointSettings::getReaderFontId() const {
         case EXTRA_LARGE:
           return BOOKERLY_18_FONT_ID;
       }
+#endif  // OMIT_BOOKERLY
+#ifndef OMIT_NOTOSANS
     case NOTOSANS:
       switch (fontSize) {
         case SMALL:
@@ -337,6 +367,8 @@ int CrossPointSettings::getReaderFontId() const {
         case EXTRA_LARGE:
           return NOTOSANS_18_FONT_ID;
       }
+#endif  // OMIT_NOTOSANS
+#ifndef OMIT_OPENDYSLEXIC
     case OPENDYSLEXIC:
       switch (fontSize) {
         case SMALL:
@@ -349,5 +381,17 @@ int CrossPointSettings::getReaderFontId() const {
         case EXTRA_LARGE:
           return OPENDYSLEXIC_14_FONT_ID;
       }
+#endif  // OMIT_OPENDYSLEXIC
+    default:
+      // Fallback to first available font family at medium size
+#if !defined(OMIT_BOOKERLY)
+      return BOOKERLY_14_FONT_ID;
+#elif !defined(OMIT_NOTOSANS)
+      return NOTOSANS_14_FONT_ID;
+#elif !defined(OMIT_OPENDYSLEXIC)
+      return OPENDYSLEXIC_10_FONT_ID;
+#else
+#error "At least one font family must be available"
+#endif
   }
 }

src/SettingsList.h

@@ -6,10 +6,36 @@
 #include "KOReaderCredentialStore.h"
 #include "activities/settings/SettingsActivity.h"
 
+// Compile-time table of available font families and their enum values.
+// Used by the DynamicEnum getter/setter to map between list indices and stored FONT_FAMILY values.
+struct FontFamilyMapping {
+  const char* name;
+  uint8_t value;
+};
+inline constexpr FontFamilyMapping kFontFamilyMappings[] = {
+#ifndef OMIT_BOOKERLY
+    {"Bookerly", CrossPointSettings::BOOKERLY},
+#endif
+#ifndef OMIT_NOTOSANS
+    {"Noto Sans", CrossPointSettings::NOTOSANS},
+#endif
+#ifndef OMIT_OPENDYSLEXIC
+    {"Open Dyslexic", CrossPointSettings::OPENDYSLEXIC},
+#endif
+};
+inline constexpr size_t kFontFamilyMappingCount = sizeof(kFontFamilyMappings) / sizeof(kFontFamilyMappings[0]);
+static_assert(kFontFamilyMappingCount > 0, "At least one font family must be available");
+
 // Shared settings list used by both the device settings UI and the web settings API.
 // Each entry has a key (for JSON API) and category (for grouping).
 // ACTION-type entries and entries without a key are device-only.
 inline std::vector<SettingInfo> getSettingsList() {
+  // Build font family options from the compile-time mapping table
+  std::vector<std::string> fontFamilyOptions;
+  for (size_t i = 0; i < kFontFamilyMappingCount; i++) {
+    fontFamilyOptions.push_back(kFontFamilyMappings[i].name);
+  }
+
   return {
       // --- Display ---
       SettingInfo::Enum("Sleep Screen", &CrossPointSettings::sleepScreen,
@@ -32,7 +58,19 @@ inline std::vector<SettingInfo> getSettingsList() {
       SettingInfo::Toggle("Sunlight Fading Fix", &CrossPointSettings::fadingFix, "fadingFix", "Display"),
 
       // --- Reader ---
-      SettingInfo::Enum("Font Family", &CrossPointSettings::fontFamily, {"Bookerly", "Noto Sans", "Open Dyslexic"},
+      SettingInfo::DynamicEnum(
+          "Font Family", std::move(fontFamilyOptions),
+          []() -> uint8_t {
+            for (uint8_t i = 0; i < kFontFamilyMappingCount; i++) {
+              if (kFontFamilyMappings[i].value == SETTINGS.fontFamily) return i;
+            }
+            return 0;  // fallback to first available family
+          },
+          [](uint8_t idx) {
+            if (idx < kFontFamilyMappingCount) {
+              SETTINGS.fontFamily = kFontFamilyMappings[idx].value;
+            }
+          },
           "fontFamily", "Reader"),
       SettingInfo::Enum("Font Size", &CrossPointSettings::fontSize, {"Small", "Medium", "Large", "X Large"}, "fontSize",
                         "Reader"),

src/activities/ActivityWithSubactivity.h

@@ -14,4 +14,6 @@ class ActivityWithSubactivity : public Activity {
       : Activity(std::move(name), renderer, mappedInput) {}
   void loop() override;
   void onExit() override;
+  bool preventAutoSleep() override { return subActivity && subActivity->preventAutoSleep(); }
+  bool skipLoopDelay() override { return subActivity && subActivity->skipLoopDelay(); }
 };

src/activities/boot_sleep/SleepActivity.cpp

@@ -4,6 +4,7 @@
 #include <GfxRenderer.h>
 #include <HalStorage.h>
 #include <Logging.h>
+#include <PlaceholderCoverGenerator.h>
 #include <Serialization.h>
 #include <Txt.h>
 #include <Xtc.h>
@@ -599,6 +600,11 @@ void SleepActivity::renderCoverSleepScreen() const {
     }
 
     if (!lastXtc.generateCoverBmp()) {
+      LOG_DBG("SLP", "XTC cover generation failed, trying placeholder");
+      PlaceholderCoverGenerator::generate(lastXtc.getCoverBmpPath(), lastXtc.getTitle(), lastXtc.getAuthor(), 480, 800);
+    }
+
+    if (!Storage.exists(lastXtc.getCoverBmpPath().c_str())) {
       LOG_ERR("SLP", "Failed to generate XTC cover bmp");
       return (this->*renderNoCoverSleepScreen)();
     }
@@ -614,6 +620,11 @@ void SleepActivity::renderCoverSleepScreen() const {
     }
 
     if (!lastTxt.generateCoverBmp()) {
+      LOG_DBG("SLP", "TXT cover generation failed, trying placeholder");
+      PlaceholderCoverGenerator::generate(lastTxt.getCoverBmpPath(), lastTxt.getTitle(), "", 480, 800);
+    }
+
+    if (!Storage.exists(lastTxt.getCoverBmpPath().c_str())) {
       LOG_ERR("SLP", "No cover image found for TXT file");
       return (this->*renderNoCoverSleepScreen)();
     }
@@ -630,6 +641,12 @@ void SleepActivity::renderCoverSleepScreen() const {
     }
 
     if (!lastEpub.generateCoverBmp(cropped)) {
+      LOG_DBG("SLP", "EPUB cover generation failed, trying placeholder");
+      PlaceholderCoverGenerator::generate(lastEpub.getCoverBmpPath(cropped), lastEpub.getTitle(),
+                                         lastEpub.getAuthor(), 480, 800);
+    }
+
+    if (!Storage.exists(lastEpub.getCoverBmpPath(cropped).c_str())) {
       LOG_ERR("SLP", "Failed to generate cover bmp");
       return (this->*renderNoCoverSleepScreen)();
     }

src/activities/home/HomeActivity.cpp

@@ -5,6 +5,7 @@
 #include <GfxRenderer.h>
 #include <HalStorage.h>
 #include <Utf8.h>
+#include <PlaceholderCoverGenerator.h>
 #include <Xtc.h>
 
 #include <cstring>
@@ -65,47 +66,37 @@ void HomeActivity::loadRecentCovers(int coverHeight) {
     if (!book.coverBmpPath.empty()) {
       std::string coverPath = UITheme::getCoverThumbPath(book.coverBmpPath, coverHeight);
       if (!Storage.exists(coverPath.c_str())) {
-        // If epub, try to load the metadata for title/author and cover
+        if (!showingLoading) {
+          showingLoading = true;
+          popupRect = GUI.drawPopup(renderer, "Loading...");
+        }
+        GUI.fillPopupProgress(renderer, popupRect, 10 + progress * (90 / recentBooks.size()));
+
+        bool success = false;
+
+        // Try format-specific thumbnail generation first
         if (StringUtils::checkFileExtension(book.path, ".epub")) {
           Epub epub(book.path, "/.crosspoint");
-          // Skip loading css since we only need metadata here
           epub.load(false, true);
-
-          // Try to generate thumbnail image for Continue Reading card
-          if (!showingLoading) {
-            showingLoading = true;
-            popupRect = GUI.drawPopup(renderer, "Loading...");
-          }
-          GUI.fillPopupProgress(renderer, popupRect, 10 + progress * (90 / recentBooks.size()));
-          bool success = epub.generateThumbBmp(coverHeight);
-          if (!success) {
-            RECENT_BOOKS.updateBook(book.path, book.title, book.author, "");
-            book.coverBmpPath = "";
-          }
-          coverRendered = false;
-          updateRequired = true;
+          success = epub.generateThumbBmp(coverHeight);
         } else if (StringUtils::checkFileExtension(book.path, ".xtch") ||
                    StringUtils::checkFileExtension(book.path, ".xtc")) {
-          // Handle XTC file
           Xtc xtc(book.path, "/.crosspoint");
           if (xtc.load()) {
-            // Try to generate thumbnail image for Continue Reading card
-            if (!showingLoading) {
-              showingLoading = true;
-              popupRect = GUI.drawPopup(renderer, "Loading...");
+            success = xtc.generateThumbBmp(coverHeight);
           }
-            GUI.fillPopupProgress(renderer, popupRect, 10 + progress * (90 / recentBooks.size()));
-            bool success = xtc.generateThumbBmp(coverHeight);
-            if (!success) {
-              RECENT_BOOKS.updateBook(book.path, book.title, book.author, "");
-              book.coverBmpPath = "";
         }
+
+        // Fallback: generate a placeholder thumbnail with title/author
+        if (!success && !Storage.exists(coverPath.c_str())) {
+          const int thumbWidth = static_cast<int>(coverHeight * 0.6);
+          PlaceholderCoverGenerator::generate(coverPath, book.title, book.author, thumbWidth, coverHeight);
+        }
+
         coverRendered = false;
         updateRequired = true;
       }
     }
-      }
-    }
     progress++;
   }
 

src/activities/reader/DictionaryDefinitionActivity.cpp

@@ -450,8 +450,16 @@ void DictionaryDefinitionActivity::loop() {
     updateRequired = true;
   }
 
-  if (mappedInput.wasReleased(MappedInputManager::Button::Back) ||
-      mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
+  if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
+    if (onDone) {
+      onDone();
+    } else {
+      onBack();
+    }
+    return;
+  }
+
+  if (mappedInput.wasReleased(MappedInputManager::Button::Back)) {
     onBack();
     return;
   }
@@ -491,8 +499,8 @@ void DictionaryDefinitionActivity::renderScreen() {
                       renderer.getScreenHeight() - 50, pageInfo.c_str());
   }
 
-  // Button hints (bottom face buttons — hide Confirm stub like Home Screen)
-  const auto labels = mappedInput.mapLabels("\xC2\xAB Back", "", "\xC2\xAB Page", "Page \xC2\xBB");
+  // Button hints (bottom face buttons)
+  const auto labels = mappedInput.mapLabels("\xC2\xAB Back", onDone ? "Done" : "", "\xC2\xAB Page", "Page \xC2\xBB");
   GUI.drawButtonHints(renderer, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
 
   // Side button hints (drawn in portrait coordinates for correct placement)

src/activities/reader/DictionaryDefinitionActivity.h

@@ -14,13 +14,15 @@ class DictionaryDefinitionActivity final : public Activity {
  public:
   explicit DictionaryDefinitionActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
                                         const std::string& headword, const std::string& definition, int readerFontId,
-                                        uint8_t orientation, const std::function<void()>& onBack)
+                                        uint8_t orientation, const std::function<void()>& onBack,
+                                        const std::function<void()>& onDone = nullptr)
       : Activity("DictionaryDefinition", renderer, mappedInput),
         headword(headword),
         definition(definition),
         readerFontId(readerFontId),
         orientation(orientation),
-        onBack(onBack) {}
+        onBack(onBack),
+        onDone(onDone) {}
 
   void onEnter() override;
   void onExit() override;
@@ -53,6 +55,7 @@ class DictionaryDefinitionActivity final : public Activity {
   int readerFontId;
   uint8_t orientation;
   const std::function<void()> onBack;
+  const std::function<void()> onDone;
 
   std::vector<std::vector<Segment>> wrappedLines;
   int currentPage = 0;

src/activities/reader/DictionarySuggestionsActivity.cpp

@@ -0,0 +1,141 @@
+#include "DictionarySuggestionsActivity.h"
+
+#include <GfxRenderer.h>
+
+#include "DictionaryDefinitionActivity.h"
+#include "MappedInputManager.h"
+#include "components/UITheme.h"
+#include "fontIds.h"
+#include "util/Dictionary.h"
+
+void DictionarySuggestionsActivity::taskTrampoline(void* param) {
+  auto* self = static_cast<DictionarySuggestionsActivity*>(param);
+  self->displayTaskLoop();
+}
+
+void DictionarySuggestionsActivity::displayTaskLoop() {
+  while (true) {
+    if (updateRequired && !subActivity) {
+      updateRequired = false;
+      xSemaphoreTake(renderingMutex, portMAX_DELAY);
+      renderScreen();
+      xSemaphoreGive(renderingMutex);
+    }
+    vTaskDelay(10 / portTICK_PERIOD_MS);
+  }
+}
+
+void DictionarySuggestionsActivity::onEnter() {
+  ActivityWithSubactivity::onEnter();
+  renderingMutex = xSemaphoreCreateMutex();
+  updateRequired = true;
+  xTaskCreate(&DictionarySuggestionsActivity::taskTrampoline, "DictSugTask", 4096, this, 1, &displayTaskHandle);
+}
+
+void DictionarySuggestionsActivity::onExit() {
+  ActivityWithSubactivity::onExit();
+  xSemaphoreTake(renderingMutex, portMAX_DELAY);
+  if (displayTaskHandle) {
+    vTaskDelete(displayTaskHandle);
+    displayTaskHandle = nullptr;
+  }
+  vSemaphoreDelete(renderingMutex);
+  renderingMutex = nullptr;
+}
+
+void DictionarySuggestionsActivity::loop() {
+  if (subActivity) {
+    subActivity->loop();
+    if (pendingBackFromDef) {
+      pendingBackFromDef = false;
+      exitActivity();
+      updateRequired = true;
+    }
+    if (pendingExitToReader) {
+      pendingExitToReader = false;
+      exitActivity();
+      onDone();
+    }
+    return;
+  }
+
+  if (suggestions.empty()) {
+    if (mappedInput.wasReleased(MappedInputManager::Button::Back)) {
+      onBack();
+    }
+    return;
+  }
+
+  buttonNavigator.onNext([this] {
+    selectedIndex = ButtonNavigator::nextIndex(selectedIndex, static_cast<int>(suggestions.size()));
+    updateRequired = true;
+  });
+
+  buttonNavigator.onPrevious([this] {
+    selectedIndex = ButtonNavigator::previousIndex(selectedIndex, static_cast<int>(suggestions.size()));
+    updateRequired = true;
+  });
+
+  if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
+    const std::string& selected = suggestions[selectedIndex];
+    std::string definition = Dictionary::lookup(selected);
+
+    if (definition.empty()) {
+      GUI.drawPopup(renderer, "Not found");
+      renderer.displayBuffer(HalDisplay::FAST_REFRESH);
+      vTaskDelay(1000 / portTICK_PERIOD_MS);
+      updateRequired = true;
+      return;
+    }
+
+    enterNewActivity(new DictionaryDefinitionActivity(
+        renderer, mappedInput, selected, definition, readerFontId, orientation,
+        [this]() { pendingBackFromDef = true; }, [this]() { pendingExitToReader = true; }));
+    return;
+  }
+
+  if (mappedInput.wasReleased(MappedInputManager::Button::Back)) {
+    onBack();
+    return;
+  }
+}
+
+void DictionarySuggestionsActivity::renderScreen() {
+  renderer.clearScreen();
+
+  const auto orient = renderer.getOrientation();
+  const auto metrics = UITheme::getInstance().getMetrics();
+  const bool isLandscapeCw = orient == GfxRenderer::Orientation::LandscapeClockwise;
+  const bool isLandscapeCcw = orient == GfxRenderer::Orientation::LandscapeCounterClockwise;
+  const bool isInverted = orient == GfxRenderer::Orientation::PortraitInverted;
+  const int hintGutterWidth = (isLandscapeCw || isLandscapeCcw) ? metrics.sideButtonHintsWidth : 0;
+  const int hintGutterHeight = isInverted ? (metrics.buttonHintsHeight + metrics.verticalSpacing) : 0;
+  const int contentX = isLandscapeCw ? hintGutterWidth : 0;
+  const int leftPadding = contentX + metrics.contentSidePadding;
+  const int pageWidth = renderer.getScreenWidth();
+  const int pageHeight = renderer.getScreenHeight();
+
+  // Header
+  GUI.drawHeader(
+      renderer,
+      Rect{contentX, hintGutterHeight + metrics.topPadding, pageWidth - hintGutterWidth, metrics.headerHeight},
+      "Did you mean?");
+
+  // Subtitle: the original word (manual, below header)
+  const int subtitleY = hintGutterHeight + metrics.topPadding + metrics.headerHeight + 5;
+  std::string subtitle = "\"" + originalWord + "\" not found";
+  renderer.drawText(SMALL_FONT_ID, leftPadding, subtitleY, subtitle.c_str());
+
+  // Suggestion list
+  const int listTop = subtitleY + 25;
+  const int listHeight = pageHeight - listTop - metrics.buttonHintsHeight - metrics.verticalSpacing;
+  GUI.drawList(
+      renderer, Rect{contentX, listTop, pageWidth - hintGutterWidth, listHeight}, suggestions.size(), selectedIndex,
+      [this](int index) { return suggestions[index]; }, nullptr, nullptr, nullptr);
+
+  // Button hints
+  const auto labels = mappedInput.mapLabels("\xC2\xAB Back", "Select", "Up", "Down");
+  GUI.drawButtonHints(renderer, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
+
+  renderer.displayBuffer(HalDisplay::FAST_REFRESH);
+}

src/activities/reader/DictionarySuggestionsActivity.h

@@ -0,0 +1,53 @@
+#pragma once
+#include <freertos/FreeRTOS.h>
+#include <freertos/semphr.h>
+#include <freertos/task.h>
+
+#include <functional>
+#include <string>
+#include <vector>
+
+#include "../ActivityWithSubactivity.h"
+#include "util/ButtonNavigator.h"
+
+class DictionarySuggestionsActivity final : public ActivityWithSubactivity {
+ public:
+  explicit DictionarySuggestionsActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
+                                         const std::string& originalWord, const std::vector<std::string>& suggestions,
+                                         int readerFontId, uint8_t orientation, const std::string& cachePath,
+                                         const std::function<void()>& onBack, const std::function<void()>& onDone)
+      : ActivityWithSubactivity("DictionarySuggestions", renderer, mappedInput),
+        originalWord(originalWord),
+        suggestions(suggestions),
+        readerFontId(readerFontId),
+        orientation(orientation),
+        cachePath(cachePath),
+        onBack(onBack),
+        onDone(onDone) {}
+
+  void onEnter() override;
+  void onExit() override;
+  void loop() override;
+
+ private:
+  std::string originalWord;
+  std::vector<std::string> suggestions;
+  int readerFontId;
+  uint8_t orientation;
+  std::string cachePath;
+  const std::function<void()> onBack;
+  const std::function<void()> onDone;
+
+  int selectedIndex = 0;
+  bool updateRequired = false;
+  bool pendingBackFromDef = false;
+  bool pendingExitToReader = false;
+  ButtonNavigator buttonNavigator;
+
+  TaskHandle_t displayTaskHandle = nullptr;
+  SemaphoreHandle_t renderingMutex = nullptr;
+
+  void renderScreen();
+  static void taskTrampoline(void* param);
+  [[noreturn]] void displayTaskLoop();
+};

src/activities/reader/DictionaryWordSelectActivity.cpp

@@ -6,6 +6,8 @@
 #include <climits>
 
 #include "CrossPointSettings.h"
+#include "DictionaryDefinitionActivity.h"
+#include "DictionarySuggestionsActivity.h"
 #include "MappedInputManager.h"
 #include "components/UITheme.h"
 #include "fontIds.h"
@@ -19,7 +21,7 @@ void DictionaryWordSelectActivity::taskTrampoline(void* param) {
 
 void DictionaryWordSelectActivity::displayTaskLoop() {
   while (true) {
-    if (updateRequired) {
+    if (updateRequired && !subActivity) {
       updateRequired = false;
       xSemaphoreTake(renderingMutex, portMAX_DELAY);
       renderScreen();
@@ -30,7 +32,7 @@ void DictionaryWordSelectActivity::displayTaskLoop() {
 }
 
 void DictionaryWordSelectActivity::onEnter() {
-  Activity::onEnter();
+  ActivityWithSubactivity::onEnter();
   renderingMutex = xSemaphoreCreateMutex();
   extractWords();
   mergeHyphenatedWords();
@@ -43,7 +45,7 @@ void DictionaryWordSelectActivity::onEnter() {
 }
 
 void DictionaryWordSelectActivity::onExit() {
-  Activity::onExit();
+  ActivityWithSubactivity::onExit();
   xSemaphoreTake(renderingMutex, portMAX_DELAY);
   if (displayTaskHandle) {
     vTaskDelete(displayTaskHandle);
@@ -82,9 +84,55 @@ void DictionaryWordSelectActivity::extractWords() {
     while (wordIt != wordList.end() && xIt != xPosList.end()) {
       int16_t screenX = line->xPos + static_cast<int16_t>(*xIt) + marginLeft;
       int16_t screenY = line->yPos + marginTop;
-      int16_t wordWidth = renderer.getTextWidth(fontId, wordIt->c_str());
+      const std::string& wordText = *wordIt;
+
+      // Split on en-dash (U+2013: E2 80 93) and em-dash (U+2014: E2 80 94)
+      std::vector<size_t> splitStarts;
+      size_t partStart = 0;
+      for (size_t i = 0; i < wordText.size();) {
+        if (i + 2 < wordText.size() && static_cast<uint8_t>(wordText[i]) == 0xE2 &&
+            static_cast<uint8_t>(wordText[i + 1]) == 0x80 &&
+            (static_cast<uint8_t>(wordText[i + 2]) == 0x93 || static_cast<uint8_t>(wordText[i + 2]) == 0x94)) {
+          if (i > partStart) splitStarts.push_back(partStart);
+          i += 3;
+          partStart = i;
+        } else {
+          i++;
+        }
+      }
+      if (partStart < wordText.size()) splitStarts.push_back(partStart);
+
+      if (splitStarts.size() <= 1 && partStart == 0) {
+        // No dashes found -- add as a single word
+        int16_t wordWidth = renderer.getTextWidth(fontId, wordText.c_str());
+        words.push_back({wordText, screenX, screenY, wordWidth, 0});
+      } else {
+        // Add each part as a separate selectable word
+        for (size_t si = 0; si < splitStarts.size(); si++) {
+          size_t start = splitStarts[si];
+          size_t end = (si + 1 < splitStarts.size()) ? splitStarts[si + 1] : wordText.size();
+          // Find actual end by trimming any trailing dash bytes
+          size_t textEnd = end;
+          while (textEnd > start && textEnd <= wordText.size()) {
+            if (textEnd >= 3 && static_cast<uint8_t>(wordText[textEnd - 3]) == 0xE2 &&
+                static_cast<uint8_t>(wordText[textEnd - 2]) == 0x80 &&
+                (static_cast<uint8_t>(wordText[textEnd - 1]) == 0x93 ||
+                 static_cast<uint8_t>(wordText[textEnd - 1]) == 0x94)) {
+              textEnd -= 3;
+            } else {
+              break;
+            }
+          }
+          std::string part = wordText.substr(start, textEnd - start);
+          if (part.empty()) continue;
+
+          std::string prefix = wordText.substr(0, start);
+          int16_t offsetX = prefix.empty() ? 0 : renderer.getTextWidth(fontId, prefix.c_str());
+          int16_t partWidth = renderer.getTextWidth(fontId, part.c_str());
+          words.push_back({part, static_cast<int16_t>(screenX + offsetX), screenY, partWidth, 0});
+        }
+      }
 
-      words.push_back({*wordIt, screenX, screenY, wordWidth, 0});
       ++wordIt;
       ++xIt;
     }
@@ -146,11 +194,53 @@ void DictionaryWordSelectActivity::mergeHyphenatedWords() {
     words[nextWordIdx].continuationIndex = nextWordIdx;  // self-ref so highlight logic finds the second part
   }
 
+  // Cross-page hyphenation: last word on page + first word of next page
+  if (!nextPageFirstWord.empty() && !rows.empty()) {
+    int lastWordIdx = rows.back().wordIndices.back();
+    const std::string& lastWord = words[lastWordIdx].text;
+    if (!lastWord.empty()) {
+      bool endsWithHyphen = false;
+      if (lastWord.back() == '-') {
+        endsWithHyphen = true;
+      } else if (lastWord.size() >= 2 && static_cast<uint8_t>(lastWord[lastWord.size() - 2]) == 0xC2 &&
+                 static_cast<uint8_t>(lastWord[lastWord.size() - 1]) == 0xAD) {
+        endsWithHyphen = true;
+      }
+      if (endsWithHyphen) {
+        std::string firstPart = lastWord;
+        if (firstPart.back() == '-') {
+          firstPart.pop_back();
+        } else if (firstPart.size() >= 2 && static_cast<uint8_t>(firstPart[firstPart.size() - 2]) == 0xC2 &&
+                   static_cast<uint8_t>(firstPart[firstPart.size() - 1]) == 0xAD) {
+          firstPart.erase(firstPart.size() - 2);
+        }
+        std::string merged = firstPart + nextPageFirstWord;
+        words[lastWordIdx].lookupText = merged;
+      }
+    }
+  }
+
   // Remove empty rows that may result from merging (e.g., a row whose only word was a continuation)
   rows.erase(std::remove_if(rows.begin(), rows.end(), [](const Row& r) { return r.wordIndices.empty(); }), rows.end());
 }
 
 void DictionaryWordSelectActivity::loop() {
+  // Delegate to subactivity (definition/suggestions screen) if active
+  if (subActivity) {
+    subActivity->loop();
+    if (pendingBackFromDef) {
+      pendingBackFromDef = false;
+      exitActivity();
+      updateRequired = true;
+    }
+    if (pendingExitToReader) {
+      pendingExitToReader = false;
+      exitActivity();
+      onBack();
+    }
+    return;
+  }
+
   if (words.empty()) {
     if (mappedInput.wasReleased(MappedInputManager::Button::Back)) {
       onBack();
@@ -297,7 +387,36 @@ void DictionaryWordSelectActivity::loop() {
       return;
     }
 
-    if (definition.empty()) {
+    LookupHistory::addWord(cachePath, cleaned);
+
+    if (!definition.empty()) {
+      enterNewActivity(new DictionaryDefinitionActivity(
+          renderer, mappedInput, cleaned, definition, fontId, orientation,
+          [this]() { pendingBackFromDef = true; }, [this]() { pendingExitToReader = true; }));
+      return;
+    }
+
+    // Try stem variants (e.g., "jumped" -> "jump")
+    auto stems = Dictionary::getStemVariants(cleaned);
+    for (const auto& stem : stems) {
+      std::string stemDef = Dictionary::lookup(stem);
+      if (!stemDef.empty()) {
+        enterNewActivity(new DictionaryDefinitionActivity(
+            renderer, mappedInput, stem, stemDef, fontId, orientation,
+            [this]() { pendingBackFromDef = true; }, [this]() { pendingExitToReader = true; }));
+        return;
+      }
+    }
+
+    // Find similar words for suggestions
+    auto similar = Dictionary::findSimilar(cleaned, 6);
+    if (!similar.empty()) {
+      enterNewActivity(new DictionarySuggestionsActivity(
+          renderer, mappedInput, cleaned, similar, fontId, orientation, cachePath,
+          [this]() { pendingBackFromDef = true; }, [this]() { pendingExitToReader = true; }));
+      return;
+    }
+
     GUI.drawPopup(renderer, "Not found");
     renderer.displayBuffer(HalDisplay::FAST_REFRESH);
     vTaskDelay(1500 / portTICK_PERIOD_MS);
@@ -305,11 +424,6 @@ void DictionaryWordSelectActivity::loop() {
     return;
   }
 
-    LookupHistory::addWord(cachePath, cleaned);
-    onLookup(cleaned, definition);
-    return;
-  }
-
   if (mappedInput.wasReleased(MappedInputManager::Button::Back)) {
     onBack();
     return;

src/activities/reader/DictionaryWordSelectActivity.h

@@ -9,16 +9,16 @@
 #include <string>
 #include <vector>
 
-#include "../Activity.h"
+#include "../ActivityWithSubactivity.h"
 
-class DictionaryWordSelectActivity final : public Activity {
+class DictionaryWordSelectActivity final : public ActivityWithSubactivity {
  public:
   explicit DictionaryWordSelectActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
                                         std::unique_ptr<Page> page, int fontId, int marginLeft, int marginTop,
                                         const std::string& cachePath, uint8_t orientation,
                                         const std::function<void()>& onBack,
-                                        const std::function<void(const std::string&, const std::string&)>& onLookup)
-      : Activity("DictionaryWordSelect", renderer, mappedInput),
+                                        const std::string& nextPageFirstWord = "")
+      : ActivityWithSubactivity("DictionaryWordSelect", renderer, mappedInput),
         page(std::move(page)),
         fontId(fontId),
         marginLeft(marginLeft),
@@ -26,7 +26,7 @@ class DictionaryWordSelectActivity final : public Activity {
         cachePath(cachePath),
         orientation(orientation),
         onBack(onBack),
-        onLookup(onLookup) {}
+        nextPageFirstWord(nextPageFirstWord) {}
 
   void onEnter() override;
   void onExit() override;
@@ -58,13 +58,15 @@ class DictionaryWordSelectActivity final : public Activity {
   std::string cachePath;
   uint8_t orientation;
   const std::function<void()> onBack;
-  const std::function<void(const std::string&, const std::string&)> onLookup;
+  std::string nextPageFirstWord;
 
   std::vector<WordInfo> words;
   std::vector<Row> rows;
   int currentRow = 0;
   int currentWordInRow = 0;
   bool updateRequired = false;
+  bool pendingBackFromDef = false;
+  bool pendingExitToReader = false;
 
   TaskHandle_t displayTaskHandle = nullptr;
   SemaphoreHandle_t renderingMutex = nullptr;

src/activities/reader/EpubReaderActivity.cpp

@@ -6,6 +6,8 @@
 #include <HalStorage.h>
 #include <Logging.h>
 
+#include <PlaceholderCoverGenerator.h>
+
 #include "CrossPointSettings.h"
 #include "CrossPointState.h"
 #include "EpubReaderBookmarkSelectionActivity.h"
@@ -19,7 +21,6 @@
 #include "fontIds.h"
 #include "util/BookmarkStore.h"
 #include "util/Dictionary.h"
-#include "util/LookupHistory.h"
 
 namespace {
 // pagesPerRefresh now comes from SETTINGS.getRefreshFrequency()
@@ -127,15 +128,31 @@ void EpubReaderActivity::onEnter() {
 
       if (!Storage.exists(epub->getCoverBmpPath(false).c_str())) {
         epub->generateCoverBmp(false);
+        // Fallback: generate placeholder if real cover extraction failed
+        if (!Storage.exists(epub->getCoverBmpPath(false).c_str())) {
+          PlaceholderCoverGenerator::generate(epub->getCoverBmpPath(false), epub->getTitle(), epub->getAuthor(), 480,
+                                             800);
+        }
         updateProgress();
       }
       if (!Storage.exists(epub->getCoverBmpPath(true).c_str())) {
         epub->generateCoverBmp(true);
+        if (!Storage.exists(epub->getCoverBmpPath(true).c_str())) {
+          PlaceholderCoverGenerator::generate(epub->getCoverBmpPath(true), epub->getTitle(), epub->getAuthor(), 480,
+                                             800);
+        }
         updateProgress();
       }
       for (int i = 0; i < PRERENDER_THUMB_HEIGHTS_COUNT; i++) {
         if (!Storage.exists(epub->getThumbBmpPath(PRERENDER_THUMB_HEIGHTS[i]).c_str())) {
           epub->generateThumbBmp(PRERENDER_THUMB_HEIGHTS[i]);
+          // Fallback: generate placeholder thumbnail
+          if (!Storage.exists(epub->getThumbBmpPath(PRERENDER_THUMB_HEIGHTS[i]).c_str())) {
+            const int thumbHeight = PRERENDER_THUMB_HEIGHTS[i];
+            const int thumbWidth = static_cast<int>(thumbHeight * 0.6);
+            PlaceholderCoverGenerator::generate(epub->getThumbBmpPath(thumbHeight), epub->getTitle(),
+                                               epub->getAuthor(), thumbWidth, thumbHeight);
+          }
           updateProgress();
         }
       }
@@ -665,24 +682,27 @@ void EpubReaderActivity::onReaderMenuConfirm(EpubReaderMenuActivity::MenuAction
       const std::string bookCachePath = epub->getCachePath();
       const uint8_t currentOrientation = SETTINGS.orientation;
 
+      // Get first word of next page for cross-page hyphenation
+      std::string nextPageFirstWord;
+      if (section && section->currentPage < section->pageCount - 1) {
+        int savedPage = section->currentPage;
+        section->currentPage = savedPage + 1;
+        auto nextPage = section->loadPageFromSectionFile();
+        section->currentPage = savedPage;
+        if (nextPage && !nextPage->elements.empty()) {
+          const auto* firstLine = static_cast<const PageLine*>(nextPage->elements[0].get());
+          if (firstLine->getBlock() && !firstLine->getBlock()->getWords().empty()) {
+            nextPageFirstWord = firstLine->getBlock()->getWords().front();
+          }
+        }
+      }
+
       exitActivity();
 
       if (pageForLookup) {
         enterNewActivity(new DictionaryWordSelectActivity(
             renderer, mappedInput, std::move(pageForLookup), readerFontId, orientedMarginLeft, orientedMarginTop,
-            bookCachePath, currentOrientation,
-            [this]() {
-              // On back from word select
-              pendingSubactivityExit = true;
-            },
-            [this, bookCachePath, readerFontId, currentOrientation](const std::string& headword,
-                                                                    const std::string& definition) {
-              // On successful lookup - show definition
-              exitActivity();
-              enterNewActivity(new DictionaryDefinitionActivity(renderer, mappedInput, headword, definition,
-                                                                readerFontId, currentOrientation,
-                                                                [this]() { pendingSubactivityExit = true; }));
-            }));
+            bookCachePath, currentOrientation, [this]() { pendingSubactivityExit = true; }, nextPageFirstWord));
       }
 
       xSemaphoreGive(renderingMutex);
@@ -690,36 +710,11 @@ void EpubReaderActivity::onReaderMenuConfirm(EpubReaderMenuActivity::MenuAction
     }
     case EpubReaderMenuActivity::MenuAction::LOOKED_UP_WORDS: {
       xSemaphoreTake(renderingMutex, portMAX_DELAY);
-      const std::string bookCachePath = epub->getCachePath();
-      const int readerFontId = SETTINGS.getReaderFontId();
-      const uint8_t currentOrientation = SETTINGS.orientation;
 
       exitActivity();
       enterNewActivity(new LookedUpWordsActivity(
-          renderer, mappedInput, bookCachePath,
-          [this]() {
-            // On back from looked up words
-            pendingSubactivityExit = true;
-          },
-          [this, bookCachePath, readerFontId, currentOrientation](const std::string& headword) {
-            // Look up the word and show definition with progress bar
-            Rect popupLayout = GUI.drawPopup(renderer, "Looking up...");
-
-            std::string definition = Dictionary::lookup(
-                headword, [this, &popupLayout](int percent) { GUI.fillPopupProgress(renderer, popupLayout, percent); });
-
-            if (definition.empty()) {
-              GUI.drawPopup(renderer, "Not found");
-              renderer.displayBuffer(HalDisplay::FAST_REFRESH);
-              vTaskDelay(1500 / portTICK_PERIOD_MS);
-              return;
-            }
-
-            exitActivity();
-            enterNewActivity(new DictionaryDefinitionActivity(renderer, mappedInput, headword, definition, readerFontId,
-                                                              currentOrientation,
-                                                              [this]() { pendingSubactivityExit = true; }));
-          }));
+          renderer, mappedInput, epub->getCachePath(), SETTINGS.getReaderFontId(), SETTINGS.orientation,
+          [this]() { pendingSubactivityExit = true; }, [this]() { pendingSubactivityExit = true; }));
       xSemaphoreGive(renderingMutex);
       break;
     }
@@ -866,6 +861,8 @@ void EpubReaderActivity::renderScreen() {
   }
 
   if (!section) {
+    loadingSection = true;
+
     const auto filepath = epub->getSpineItem(currentSpineIndex).href;
     LOG_DBG("ERS", "Loading file: %s, index: %d", filepath.c_str(), currentSpineIndex);
     section = std::unique_ptr<Section>(new Section(epub, currentSpineIndex, renderer));
@@ -885,6 +882,7 @@ void EpubReaderActivity::renderScreen() {
                                       viewportHeight, SETTINGS.hyphenationEnabled, SETTINGS.embeddedStyle, popupFn)) {
         LOG_ERR("ERS", "Failed to persist page data to SD");
         section.reset();
+        loadingSection = false;
         return;
       }
     } else {
@@ -917,6 +915,8 @@ void EpubReaderActivity::renderScreen() {
       section->currentPage = newPage;
       pendingPercentJump = false;
     }
+
+    loadingSection = false;
   }
 
   renderer.clearScreen();

src/activities/reader/EpubReaderActivity.h

@@ -5,7 +5,6 @@
 #include <freertos/semphr.h>
 #include <freertos/task.h>
 
-#include "DictionaryDefinitionActivity.h"
 #include "DictionaryWordSelectActivity.h"
 #include "EpubReaderMenuActivity.h"
 #include "LookedUpWordsActivity.h"
@@ -30,6 +29,7 @@ class EpubReaderActivity final : public ActivityWithSubactivity {
   bool pendingSubactivityExit = false;  // Defer subactivity exit to avoid use-after-free
   bool pendingGoHome = false;           // Defer go home to avoid race condition with display task
   bool skipNextButtonCheck = false;     // Skip button processing for one frame after subactivity exit
+  volatile bool loadingSection = false;  // True during the entire !section block (read from main loop)
   const std::function<void()> onGoBack;
   const std::function<void()> onGoHome;
 
@@ -56,4 +56,10 @@ class EpubReaderActivity final : public ActivityWithSubactivity {
   void onEnter() override;
   void onExit() override;
   void loop() override;
+  // Defer low-power mode and auto-sleep while a section is loading/building.
+  // !section covers the period before the Section object is created (including
+  // cover prerendering in onEnter). loadingSection covers the full !section block
+  // in renderScreen (including createSectionFile), during which section is non-null
+  // but the section file is still being built.
+  bool preventAutoSleep() override { return !section || loadingSection; }
 };

src/activities/reader/LookedUpWordsActivity.cpp

@@ -4,9 +4,12 @@
 
 #include <algorithm>
 
+#include "DictionaryDefinitionActivity.h"
+#include "DictionarySuggestionsActivity.h"
 #include "MappedInputManager.h"
 #include "components/UITheme.h"
 #include "fontIds.h"
+#include "util/Dictionary.h"
 #include "util/LookupHistory.h"
 
 void LookedUpWordsActivity::taskTrampoline(void* param) {
@@ -30,6 +33,7 @@ void LookedUpWordsActivity::onEnter() {
   ActivityWithSubactivity::onEnter();
   renderingMutex = xSemaphoreCreateMutex();
   words = LookupHistory::load(cachePath);
+  std::reverse(words.begin(), words.end());
   updateRequired = true;
   xTaskCreate(&LookedUpWordsActivity::taskTrampoline, "LookedUpTask", 4096, this, 1, &displayTaskHandle);
 }
@@ -48,6 +52,16 @@ void LookedUpWordsActivity::onExit() {
 void LookedUpWordsActivity::loop() {
   if (subActivity) {
     subActivity->loop();
+    if (pendingBackFromDef) {
+      pendingBackFromDef = false;
+      exitActivity();
+      updateRequired = true;
+    }
+    if (pendingExitToReader) {
+      pendingExitToReader = false;
+      exitActivity();
+      onDone();
+    }
     return;
   }
 
@@ -94,18 +108,68 @@ void LookedUpWordsActivity::loop() {
     return;
   }
 
-  buttonNavigator.onNext([this] {
-    selectedIndex = ButtonNavigator::nextIndex(selectedIndex, static_cast<int>(words.size()));
+  const int totalItems = static_cast<int>(words.size());
+  const int pageItems = getPageItems();
+
+  buttonNavigator.onNextRelease([this, totalItems] {
+    selectedIndex = ButtonNavigator::nextIndex(selectedIndex, totalItems);
     updateRequired = true;
   });
 
-  buttonNavigator.onPrevious([this] {
-    selectedIndex = ButtonNavigator::previousIndex(selectedIndex, static_cast<int>(words.size()));
+  buttonNavigator.onPreviousRelease([this, totalItems] {
+    selectedIndex = ButtonNavigator::previousIndex(selectedIndex, totalItems);
+    updateRequired = true;
+  });
+
+  buttonNavigator.onNextContinuous([this, totalItems, pageItems] {
+    selectedIndex = ButtonNavigator::nextPageIndex(selectedIndex, totalItems, pageItems);
+    updateRequired = true;
+  });
+
+  buttonNavigator.onPreviousContinuous([this, totalItems, pageItems] {
+    selectedIndex = ButtonNavigator::previousPageIndex(selectedIndex, totalItems, pageItems);
     updateRequired = true;
   });
 
   if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
-    onSelectWord(words[selectedIndex]);
+    const std::string& headword = words[selectedIndex];
+
+    Rect popupLayout = GUI.drawPopup(renderer, "Looking up...");
+    std::string definition = Dictionary::lookup(
+        headword, [this, &popupLayout](int percent) { GUI.fillPopupProgress(renderer, popupLayout, percent); });
+
+    if (!definition.empty()) {
+      enterNewActivity(new DictionaryDefinitionActivity(
+          renderer, mappedInput, headword, definition, readerFontId, orientation,
+          [this]() { pendingBackFromDef = true; }, [this]() { pendingExitToReader = true; }));
+      return;
+    }
+
+    // Try stem variants
+    auto stems = Dictionary::getStemVariants(headword);
+    for (const auto& stem : stems) {
+      std::string stemDef = Dictionary::lookup(stem);
+      if (!stemDef.empty()) {
+        enterNewActivity(new DictionaryDefinitionActivity(
+            renderer, mappedInput, stem, stemDef, readerFontId, orientation,
+            [this]() { pendingBackFromDef = true; }, [this]() { pendingExitToReader = true; }));
+        return;
+      }
+    }
+
+    // Show similar word suggestions
+    auto similar = Dictionary::findSimilar(headword, 6);
+    if (!similar.empty()) {
+      enterNewActivity(new DictionarySuggestionsActivity(
+          renderer, mappedInput, headword, similar, readerFontId, orientation, cachePath,
+          [this]() { pendingBackFromDef = true; }, [this]() { pendingExitToReader = true; }));
+      return;
+    }
+
+    GUI.drawPopup(renderer, "Not found");
+    renderer.displayBuffer(HalDisplay::FAST_REFRESH);
+    vTaskDelay(1500 / portTICK_PERIOD_MS);
+    updateRequired = true;
     return;
   }
 
@@ -115,39 +179,46 @@ void LookedUpWordsActivity::loop() {
   }
 }
 
+int LookedUpWordsActivity::getPageItems() const {
+  const auto orient = renderer.getOrientation();
+  const auto metrics = UITheme::getInstance().getMetrics();
+  const bool isInverted = orient == GfxRenderer::Orientation::PortraitInverted;
+  const int hintGutterHeight = isInverted ? (metrics.buttonHintsHeight + metrics.verticalSpacing) : 0;
+  const int contentTop = hintGutterHeight + metrics.topPadding + metrics.headerHeight + metrics.verticalSpacing;
+  const int contentHeight =
+      renderer.getScreenHeight() - contentTop - metrics.buttonHintsHeight - metrics.verticalSpacing;
+  return std::max(1, contentHeight / metrics.listRowHeight);
+}
+
 void LookedUpWordsActivity::renderScreen() {
   renderer.clearScreen();
 
-  constexpr int sidePadding = 20;
-  constexpr int titleY = 15;
-  constexpr int startY = 60;
-  constexpr int lineHeight = 30;
+  const auto orient = renderer.getOrientation();
+  const auto metrics = UITheme::getInstance().getMetrics();
+  const bool isLandscapeCw = orient == GfxRenderer::Orientation::LandscapeClockwise;
+  const bool isLandscapeCcw = orient == GfxRenderer::Orientation::LandscapeCounterClockwise;
+  const bool isInverted = orient == GfxRenderer::Orientation::PortraitInverted;
+  const int hintGutterWidth = (isLandscapeCw || isLandscapeCcw) ? metrics.sideButtonHintsWidth : 0;
+  const int hintGutterHeight = isInverted ? (metrics.buttonHintsHeight + metrics.verticalSpacing) : 0;
+  const int contentX = isLandscapeCw ? hintGutterWidth : 0;
+  const int pageWidth = renderer.getScreenWidth();
+  const int pageHeight = renderer.getScreenHeight();
 
-  // Title
-  const int titleX =
-      (renderer.getScreenWidth() - renderer.getTextWidth(UI_12_FONT_ID, "Lookup History", EpdFontFamily::BOLD)) / 2;
-  renderer.drawText(UI_12_FONT_ID, titleX, titleY, "Lookup History", true, EpdFontFamily::BOLD);
+  // Header
+  GUI.drawHeader(
+      renderer,
+      Rect{contentX, hintGutterHeight + metrics.topPadding, pageWidth - hintGutterWidth, metrics.headerHeight},
+      "Lookup History");
+
+  const int contentTop = hintGutterHeight + metrics.topPadding + metrics.headerHeight + metrics.verticalSpacing;
+  const int contentHeight = pageHeight - contentTop - metrics.buttonHintsHeight - metrics.verticalSpacing;
 
   if (words.empty()) {
-    renderer.drawCenteredText(UI_10_FONT_ID, 300, "No words looked up yet");
+    renderer.drawCenteredText(UI_10_FONT_ID, contentTop + 20, "No words looked up yet");
   } else {
-    const int screenHeight = renderer.getScreenHeight();
-    const int pageItems = std::max(1, (screenHeight - startY - 40) / lineHeight);
-    const int pageStart = selectedIndex / pageItems * pageItems;
-
-    for (int i = 0; i < pageItems; i++) {
-      int idx = pageStart + i;
-      if (idx >= static_cast<int>(words.size())) break;
-
-      const int displayY = startY + i * lineHeight;
-      const bool isSelected = (idx == selectedIndex);
-
-      if (isSelected) {
-        renderer.fillRect(0, displayY - 2, renderer.getScreenWidth() - 1, lineHeight);
-      }
-
-      renderer.drawText(UI_10_FONT_ID, sidePadding, displayY, words[idx].c_str(), !isSelected);
-    }
+    GUI.drawList(
+        renderer, Rect{contentX, contentTop, pageWidth - hintGutterWidth, contentHeight}, words.size(), selectedIndex,
+        [this](int index) { return words[index]; }, nullptr, nullptr, nullptr);
   }
 
   if (deleteConfirmMode && pendingDeleteIndex < static_cast<int>(words.size())) {
@@ -161,12 +232,12 @@ void LookedUpWordsActivity::renderScreen() {
     std::string msg = "Delete '" + displayWord + "'?";
 
     constexpr int margin = 15;
-    constexpr int popupY = 200;
+    const int popupY = 200 + hintGutterHeight;
     const int textWidth = renderer.getTextWidth(UI_12_FONT_ID, msg.c_str(), EpdFontFamily::BOLD);
     const int textHeight = renderer.getLineHeight(UI_12_FONT_ID);
     const int w = textWidth + margin * 2;
     const int h = textHeight + margin * 2;
-    const int x = (renderer.getScreenWidth() - w) / 2;
+    const int x = contentX + (renderer.getScreenWidth() - hintGutterWidth - w) / 2;
 
     renderer.fillRect(x - 2, popupY - 2, w + 4, h + 4, true);
     renderer.fillRect(x, popupY, w, h, false);
@@ -183,12 +254,14 @@ void LookedUpWordsActivity::renderScreen() {
     if (!words.empty()) {
       const char* deleteHint = "Hold select to delete";
       const int hintWidth = renderer.getTextWidth(SMALL_FONT_ID, deleteHint);
-      renderer.drawText(SMALL_FONT_ID, (renderer.getScreenWidth() - hintWidth) / 2, renderer.getScreenHeight() - 70,
+      const int hintX = contentX + (renderer.getScreenWidth() - hintGutterWidth - hintWidth) / 2;
+      renderer.drawText(SMALL_FONT_ID, hintX,
+                        renderer.getScreenHeight() - metrics.buttonHintsHeight - metrics.verticalSpacing * 2,
                         deleteHint);
     }
 
     // Normal button hints
-    const auto labels = mappedInput.mapLabels("\xC2\xAB Back", "Select", "^", "v");
+    const auto labels = mappedInput.mapLabels("\xC2\xAB Back", "Select", "Up", "Down");
     GUI.drawButtonHints(renderer, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
   }
 

src/activities/reader/LookedUpWordsActivity.h

@@ -13,12 +13,14 @@
 class LookedUpWordsActivity final : public ActivityWithSubactivity {
  public:
   explicit LookedUpWordsActivity(GfxRenderer& renderer, MappedInputManager& mappedInput, const std::string& cachePath,
-                                 const std::function<void()>& onBack,
-                                 const std::function<void(const std::string&)>& onSelectWord)
+                                 int readerFontId, uint8_t orientation, const std::function<void()>& onBack,
+                                 const std::function<void()>& onDone)
       : ActivityWithSubactivity("LookedUpWords", renderer, mappedInput),
         cachePath(cachePath),
+        readerFontId(readerFontId),
+        orientation(orientation),
         onBack(onBack),
-        onSelectWord(onSelectWord) {}
+        onDone(onDone) {}
 
   void onEnter() override;
   void onExit() override;
@@ -26,12 +28,16 @@ class LookedUpWordsActivity final : public ActivityWithSubactivity {
 
  private:
   std::string cachePath;
+  int readerFontId;
+  uint8_t orientation;
   const std::function<void()> onBack;
-  const std::function<void(const std::string&)> onSelectWord;
+  const std::function<void()> onDone;
 
   std::vector<std::string> words;
   int selectedIndex = 0;
   bool updateRequired = false;
+  bool pendingBackFromDef = false;
+  bool pendingExitToReader = false;
   ButtonNavigator buttonNavigator;
 
   // Delete confirmation state
@@ -42,6 +48,7 @@ class LookedUpWordsActivity final : public ActivityWithSubactivity {
   TaskHandle_t displayTaskHandle = nullptr;
   SemaphoreHandle_t renderingMutex = nullptr;
 
+  int getPageItems() const;
   void renderScreen();
   static void taskTrampoline(void* param);
   [[noreturn]] void displayTaskLoop();

src/activities/reader/TxtReaderActivity.cpp

@@ -5,6 +5,8 @@
 #include <Serialization.h>
 #include <Utf8.h>
 
+#include <PlaceholderCoverGenerator.h>
+
 #include "CrossPointSettings.h"
 #include "CrossPointState.h"
 #include "MappedInputManager.h"
@@ -57,13 +59,43 @@ void TxtReaderActivity::onEnter() {
 
   txt->setupCacheDir();
 
-  // Prerender cover on first open so the Sleep screen is instant.
-  // generateCoverBmp() is a no-op if the file already exists, so this only does work once.
-  // TXT has no thumbnail support, so only the sleep screen cover is generated.
-  if (!Storage.exists(txt->getCoverBmpPath().c_str())) {
+  // Prerender covers and thumbnails on first open so Home and Sleep screens are instant.
+  // Each generate* call is a no-op if the file already exists, so this only does work once.
+  {
+    int totalSteps = 0;
+    if (!Storage.exists(txt->getCoverBmpPath().c_str())) totalSteps++;
+    for (int i = 0; i < PRERENDER_THUMB_HEIGHTS_COUNT; i++) {
+      if (!Storage.exists(txt->getThumbBmpPath(PRERENDER_THUMB_HEIGHTS[i]).c_str())) totalSteps++;
+    }
+
+    if (totalSteps > 0) {
       Rect popupRect = GUI.drawPopup(renderer, "Preparing book...");
-    txt->generateCoverBmp();
-    GUI.fillPopupProgress(renderer, popupRect, 100);
+      int completedSteps = 0;
+
+      auto updateProgress = [&]() {
+        completedSteps++;
+        GUI.fillPopupProgress(renderer, popupRect, completedSteps * 100 / totalSteps);
+      };
+
+      if (!Storage.exists(txt->getCoverBmpPath().c_str())) {
+        const bool coverGenerated = txt->generateCoverBmp();
+        // Fallback: generate placeholder if no cover image was found
+        if (!coverGenerated) {
+          PlaceholderCoverGenerator::generate(txt->getCoverBmpPath(), txt->getTitle(), "", 480, 800);
+        }
+        updateProgress();
+      }
+      for (int i = 0; i < PRERENDER_THUMB_HEIGHTS_COUNT; i++) {
+        if (!Storage.exists(txt->getThumbBmpPath(PRERENDER_THUMB_HEIGHTS[i]).c_str())) {
+          // TXT has no native thumbnail generation, always use placeholder
+          const int thumbHeight = PRERENDER_THUMB_HEIGHTS[i];
+          const int thumbWidth = static_cast<int>(thumbHeight * 0.6);
+          PlaceholderCoverGenerator::generate(txt->getThumbBmpPath(thumbHeight), txt->getTitle(), "", thumbWidth,
+                                             thumbHeight);
+          updateProgress();
+        }
+      }
+    }
   }
 
   // Save current txt as last opened file and add to recent books
@@ -71,7 +103,7 @@ void TxtReaderActivity::onEnter() {
   auto fileName = filePath.substr(filePath.rfind('/') + 1);
   APP_STATE.openEpubPath = filePath;
   APP_STATE.saveToFile();
-  RECENT_BOOKS.addBook(filePath, fileName, "", "");
+  RECENT_BOOKS.addBook(filePath, fileName, "", txt->getThumbBmpPath());
 
   // Trigger first update
   updateRequired = true;

src/activities/reader/TxtReaderActivity.h

@@ -57,4 +57,7 @@ class TxtReaderActivity final : public ActivityWithSubactivity {
   void onEnter() override;
   void onExit() override;
   void loop() override;
+  // Defer low-power mode and auto-sleep while the reader is initializing
+  // (cover prerendering, page index building on first open).
+  bool preventAutoSleep() override { return !initialized; }
 };

src/activities/reader/XtcReaderActivity.cpp

@@ -11,6 +11,8 @@
 #include <GfxRenderer.h>
 #include <HalStorage.h>
 
+#include <PlaceholderCoverGenerator.h>
+
 #include "CrossPointSettings.h"
 #include "CrossPointState.h"
 #include "MappedInputManager.h"
@@ -63,11 +65,22 @@ void XtcReaderActivity::onEnter() {
 
       if (!Storage.exists(xtc->getCoverBmpPath().c_str())) {
         xtc->generateCoverBmp();
+        // Fallback: generate placeholder if first-page cover extraction failed
+        if (!Storage.exists(xtc->getCoverBmpPath().c_str())) {
+          PlaceholderCoverGenerator::generate(xtc->getCoverBmpPath(), xtc->getTitle(), xtc->getAuthor(), 480, 800);
+        }
         updateProgress();
       }
       for (int i = 0; i < PRERENDER_THUMB_HEIGHTS_COUNT; i++) {
         if (!Storage.exists(xtc->getThumbBmpPath(PRERENDER_THUMB_HEIGHTS[i]).c_str())) {
           xtc->generateThumbBmp(PRERENDER_THUMB_HEIGHTS[i]);
+          // Fallback: generate placeholder thumbnail
+          if (!Storage.exists(xtc->getThumbBmpPath(PRERENDER_THUMB_HEIGHTS[i]).c_str())) {
+            const int thumbHeight = PRERENDER_THUMB_HEIGHTS[i];
+            const int thumbWidth = static_cast<int>(thumbHeight * 0.6);
+            PlaceholderCoverGenerator::generate(xtc->getThumbBmpPath(thumbHeight), xtc->getTitle(), xtc->getAuthor(),
+                                               thumbWidth, thumbHeight);
+          }
           updateProgress();
         }
       }

src/activities/settings/SettingsActivity.cpp

@@ -173,6 +173,9 @@ void SettingsActivity::toggleCurrentSetting() {
   } else if (setting.type == SettingType::ENUM && setting.valuePtr != nullptr) {
     const uint8_t currentValue = SETTINGS.*(setting.valuePtr);
     SETTINGS.*(setting.valuePtr) = (currentValue + 1) % static_cast<uint8_t>(setting.enumValues.size());
+  } else if (setting.type == SettingType::ENUM && setting.valueGetter && setting.valueSetter) {
+    const uint8_t currentValue = setting.valueGetter();
+    setting.valueSetter((currentValue + 1) % static_cast<uint8_t>(setting.enumValues.size()));
   } else if (setting.type == SettingType::VALUE && setting.valuePtr != nullptr) {
     const int8_t currentValue = SETTINGS.*(setting.valuePtr);
     if (currentValue + setting.valueRange.step > setting.valueRange.max) {
@@ -274,6 +277,11 @@ void SettingsActivity::render() const {
         } else if (settings[i].type == SettingType::ENUM && settings[i].valuePtr != nullptr) {
           const uint8_t value = SETTINGS.*(settings[i].valuePtr);
           valueText = settings[i].enumValues[value];
+        } else if (settings[i].type == SettingType::ENUM && settings[i].valueGetter) {
+          const uint8_t value = settings[i].valueGetter();
+          if (value < settings[i].enumValues.size()) {
+            valueText = settings[i].enumValues[value];
+          }
         } else if (settings[i].type == SettingType::VALUE && settings[i].valuePtr != nullptr) {
           valueText = std::to_string(SETTINGS.*(settings[i].valuePtr));
         }

src/main.cpp

@@ -39,13 +39,16 @@ GfxRenderer renderer(display);
 Activity* currentActivity;
 
 // Fonts
+#ifndef OMIT_BOOKERLY
 EpdFont bookerly14RegularFont(&bookerly_14_regular);
 EpdFont bookerly14BoldFont(&bookerly_14_bold);
 EpdFont bookerly14ItalicFont(&bookerly_14_italic);
 EpdFont bookerly14BoldItalicFont(&bookerly_14_bolditalic);
 EpdFontFamily bookerly14FontFamily(&bookerly14RegularFont, &bookerly14BoldFont, &bookerly14ItalicFont,
                                    &bookerly14BoldItalicFont);
+#endif  // OMIT_BOOKERLY
 #ifndef OMIT_FONTS
+#ifndef OMIT_BOOKERLY
 EpdFont bookerly12RegularFont(&bookerly_12_regular);
 EpdFont bookerly12BoldFont(&bookerly_12_bold);
 EpdFont bookerly12ItalicFont(&bookerly_12_italic);
@@ -64,7 +67,9 @@ EpdFont bookerly18ItalicFont(&bookerly_18_italic);
 EpdFont bookerly18BoldItalicFont(&bookerly_18_bolditalic);
 EpdFontFamily bookerly18FontFamily(&bookerly18RegularFont, &bookerly18BoldFont, &bookerly18ItalicFont,
                                    &bookerly18BoldItalicFont);
+#endif  // OMIT_BOOKERLY
 
+#ifndef OMIT_NOTOSANS
 EpdFont notosans12RegularFont(&notosans_12_regular);
 EpdFont notosans12BoldFont(&notosans_12_bold);
 EpdFont notosans12ItalicFont(&notosans_12_italic);
@@ -89,7 +94,9 @@ EpdFont notosans18ItalicFont(&notosans_18_italic);
 EpdFont notosans18BoldItalicFont(&notosans_18_bolditalic);
 EpdFontFamily notosans18FontFamily(&notosans18RegularFont, &notosans18BoldFont, &notosans18ItalicFont,
                                    &notosans18BoldItalicFont);
+#endif  // OMIT_NOTOSANS
 
+#ifndef OMIT_OPENDYSLEXIC
 EpdFont opendyslexic8RegularFont(&opendyslexic_8_regular);
 EpdFont opendyslexic8BoldFont(&opendyslexic_8_bold);
 EpdFont opendyslexic8ItalicFont(&opendyslexic_8_italic);
@@ -114,6 +121,7 @@ EpdFont opendyslexic14ItalicFont(&opendyslexic_14_italic);
 EpdFont opendyslexic14BoldItalicFont(&opendyslexic_14_bolditalic);
 EpdFontFamily opendyslexic14FontFamily(&opendyslexic14RegularFont, &opendyslexic14BoldFont, &opendyslexic14ItalicFont,
                                        &opendyslexic14BoldItalicFont);
+#endif  // OMIT_OPENDYSLEXIC
 #endif  // OMIT_FONTS
 
 EpdFont smallFont(&notosans_8_regular);
@@ -259,20 +267,28 @@ void setupDisplayAndFonts() {
   display.begin();
   renderer.begin();
   LOG_DBG("MAIN", "Display initialized");
+#ifndef OMIT_BOOKERLY
   renderer.insertFont(BOOKERLY_14_FONT_ID, bookerly14FontFamily);
+#endif
 #ifndef OMIT_FONTS
+#ifndef OMIT_BOOKERLY
   renderer.insertFont(BOOKERLY_12_FONT_ID, bookerly12FontFamily);
   renderer.insertFont(BOOKERLY_16_FONT_ID, bookerly16FontFamily);
   renderer.insertFont(BOOKERLY_18_FONT_ID, bookerly18FontFamily);
+#endif  // OMIT_BOOKERLY
 
+#ifndef OMIT_NOTOSANS
   renderer.insertFont(NOTOSANS_12_FONT_ID, notosans12FontFamily);
   renderer.insertFont(NOTOSANS_14_FONT_ID, notosans14FontFamily);
   renderer.insertFont(NOTOSANS_16_FONT_ID, notosans16FontFamily);
   renderer.insertFont(NOTOSANS_18_FONT_ID, notosans18FontFamily);
+#endif  // OMIT_NOTOSANS
+#ifndef OMIT_OPENDYSLEXIC
   renderer.insertFont(OPENDYSLEXIC_8_FONT_ID, opendyslexic8FontFamily);
   renderer.insertFont(OPENDYSLEXIC_10_FONT_ID, opendyslexic10FontFamily);
   renderer.insertFont(OPENDYSLEXIC_12_FONT_ID, opendyslexic12FontFamily);
   renderer.insertFont(OPENDYSLEXIC_14_FONT_ID, opendyslexic14FontFamily);
+#endif  // OMIT_OPENDYSLEXIC
 #endif  // OMIT_FONTS
   renderer.insertFont(UI_10_FONT_ID, ui10FontFamily);
   renderer.insertFont(UI_12_FONT_ID, ui12FontFamily);
@@ -424,6 +440,13 @@ void loop() {
     }
   }
 
+  // Re-check preventAutoSleep: the activity may have changed during loop() above
+  // (e.g., HomeActivity transitioned to EpubReaderActivity with pending section work).
+  if (currentActivity && currentActivity->preventAutoSleep()) {
+    lastActivityTime = millis();
+    powerManager.setPowerSaving(false);
+  }
+
   // Add delay at the end of the loop to prevent tight spinning
   // When an activity requests skip loop delay (e.g., webserver running), use yield() for faster response
   // Otherwise, use longer delay to save power

src/util/Dictionary.cpp

@@ -326,3 +326,264 @@ std::string Dictionary::lookup(const std::string& word, const std::function<void
   if (onProgress) onProgress(100);
   return result;
 }
+
+std::vector<std::string> Dictionary::getStemVariants(const std::string& word) {
+  std::vector<std::string> variants;
+  size_t len = word.size();
+  if (len < 3) return variants;
+
+  auto endsWith = [&word, len](const char* suffix) {
+    size_t slen = strlen(suffix);
+    return len >= slen && word.compare(len - slen, slen, suffix) == 0;
+  };
+
+  auto add = [&variants](const std::string& s) {
+    if (s.size() >= 2) variants.push_back(s);
+  };
+
+  // Plurals (longer suffixes first to avoid partial matches)
+  if (endsWith("sses")) add(word.substr(0, len - 2));
+  if (endsWith("ses")) add(word.substr(0, len - 2) + "is");  // analyses -> analysis
+  if (endsWith("ies")) {
+    add(word.substr(0, len - 3) + "y");
+    add(word.substr(0, len - 2));  // dies -> die, ties -> tie
+  }
+  if (endsWith("ves")) {
+    add(word.substr(0, len - 3) + "f");   // wolves -> wolf
+    add(word.substr(0, len - 3) + "fe");  // knives -> knife
+    add(word.substr(0, len - 1));          // misgives -> misgive
+  }
+  if (endsWith("men")) add(word.substr(0, len - 3) + "man");  // firemen -> fireman
+  if (endsWith("es") && !endsWith("sses") && !endsWith("ies") && !endsWith("ves")) {
+    add(word.substr(0, len - 2));
+    add(word.substr(0, len - 1));
+  }
+  if (endsWith("s") && !endsWith("ss") && !endsWith("us") && !endsWith("es")) {
+    add(word.substr(0, len - 1));
+  }
+
+  // Past tense
+  if (endsWith("ied")) {
+    add(word.substr(0, len - 3) + "y");
+    add(word.substr(0, len - 1));
+  }
+  if (endsWith("ed") && !endsWith("ied")) {
+    add(word.substr(0, len - 2));
+    add(word.substr(0, len - 1));
+    if (len > 4 && word[len - 3] == word[len - 4]) {
+      add(word.substr(0, len - 3));
+    }
+  }
+
+  // Progressive
+  if (endsWith("ying")) {
+    add(word.substr(0, len - 4) + "ie");
+  }
+  if (endsWith("ing") && !endsWith("ying")) {
+    add(word.substr(0, len - 3));
+    add(word.substr(0, len - 3) + "e");
+    if (len > 5 && word[len - 4] == word[len - 5]) {
+      add(word.substr(0, len - 4));
+    }
+  }
+
+  // Adverb
+  if (endsWith("ically")) {
+    add(word.substr(0, len - 6) + "ic");  // historically -> historic
+    add(word.substr(0, len - 4));          // basically -> basic
+  }
+  if (endsWith("ally") && !endsWith("ically")) {
+    add(word.substr(0, len - 4) + "al");  // accidentally -> accidental
+    add(word.substr(0, len - 2));          // naturally -> natur... (fallback to -ly strip)
+  }
+  if (endsWith("ily") && !endsWith("ally")) {
+    add(word.substr(0, len - 3) + "y");
+  }
+  if (endsWith("ly") && !endsWith("ily") && !endsWith("ally")) {
+    add(word.substr(0, len - 2));
+  }
+
+  // Comparative / superlative
+  if (endsWith("ier")) {
+    add(word.substr(0, len - 3) + "y");
+  }
+  if (endsWith("er") && !endsWith("ier")) {
+    add(word.substr(0, len - 2));
+    add(word.substr(0, len - 1));
+    if (len > 4 && word[len - 3] == word[len - 4]) {
+      add(word.substr(0, len - 3));
+    }
+  }
+  if (endsWith("iest")) {
+    add(word.substr(0, len - 4) + "y");
+  }
+  if (endsWith("est") && !endsWith("iest")) {
+    add(word.substr(0, len - 3));
+    add(word.substr(0, len - 2));
+    if (len > 5 && word[len - 4] == word[len - 5]) {
+      add(word.substr(0, len - 4));
+    }
+  }
+
+  // Derivational suffixes
+  if (endsWith("ness")) add(word.substr(0, len - 4));
+  if (endsWith("ment")) add(word.substr(0, len - 4));
+  if (endsWith("ful")) add(word.substr(0, len - 3));
+  if (endsWith("less")) add(word.substr(0, len - 4));
+  if (endsWith("able")) {
+    add(word.substr(0, len - 4));
+    add(word.substr(0, len - 4) + "e");
+  }
+  if (endsWith("ible")) {
+    add(word.substr(0, len - 4));
+    add(word.substr(0, len - 4) + "e");
+  }
+  if (endsWith("ation")) {
+    add(word.substr(0, len - 5));           // information -> inform
+    add(word.substr(0, len - 5) + "e");     // exploration -> explore
+    add(word.substr(0, len - 5) + "ate");   // donation -> donate
+  }
+  if (endsWith("tion") && !endsWith("ation")) {
+    add(word.substr(0, len - 4) + "te");  // completion -> complete
+    add(word.substr(0, len - 3));          // action -> act
+    add(word.substr(0, len - 3) + "e");   // reduction -> reduce
+  }
+  if (endsWith("ion") && !endsWith("tion")) {
+    add(word.substr(0, len - 3));          // revision -> revis (-> revise via +e)
+    add(word.substr(0, len - 3) + "e");   // revision -> revise
+  }
+  if (endsWith("al") && !endsWith("ial")) {
+    add(word.substr(0, len - 2));
+    add(word.substr(0, len - 2) + "e");
+  }
+  if (endsWith("ial")) {
+    add(word.substr(0, len - 3));
+    add(word.substr(0, len - 3) + "e");
+  }
+  if (endsWith("ous")) {
+    add(word.substr(0, len - 3));          // dangerous -> danger
+    add(word.substr(0, len - 3) + "e");   // famous -> fame
+  }
+  if (endsWith("ive")) {
+    add(word.substr(0, len - 3));          // active -> act
+    add(word.substr(0, len - 3) + "e");   // creative -> create
+  }
+  if (endsWith("ize")) {
+    add(word.substr(0, len - 3));          // modernize -> modern
+    add(word.substr(0, len - 3) + "e");
+  }
+  if (endsWith("ise")) {
+    add(word.substr(0, len - 3));          // advertise -> advert
+    add(word.substr(0, len - 3) + "e");
+  }
+  if (endsWith("en")) {
+    add(word.substr(0, len - 2));          // darken -> dark
+    add(word.substr(0, len - 2) + "e");   // widen -> wide
+  }
+
+  // Prefix removal
+  if (len > 5 && word.compare(0, 2, "un") == 0) add(word.substr(2));
+  if (len > 6 && word.compare(0, 3, "dis") == 0) add(word.substr(3));
+  if (len > 6 && word.compare(0, 3, "mis") == 0) add(word.substr(3));
+  if (len > 6 && word.compare(0, 3, "pre") == 0) add(word.substr(3));
+  if (len > 7 && word.compare(0, 4, "over") == 0) add(word.substr(4));
+  if (len > 5 && word.compare(0, 2, "re") == 0) add(word.substr(2));
+
+  // Deduplicate while preserving insertion order (inflectional stems first, prefixes last)
+  std::vector<std::string> deduped;
+  for (const auto& v : variants) {
+    if (std::find(deduped.begin(), deduped.end(), v) != deduped.end()) continue;
+    // cppcheck-suppress useStlAlgorithm
+    deduped.push_back(v);
+  }
+  return deduped;
+}
+
+int Dictionary::editDistance(const std::string& a, const std::string& b, int maxDist) {
+  int m = static_cast<int>(a.size());
+  int n = static_cast<int>(b.size());
+  if (std::abs(m - n) > maxDist) return maxDist + 1;
+
+  std::vector<int> dp(n + 1);
+  for (int j = 0; j <= n; j++) dp[j] = j;
+
+  for (int i = 1; i <= m; i++) {
+    int prev = dp[0];
+    dp[0] = i;
+    int rowMin = dp[0];
+    for (int j = 1; j <= n; j++) {
+      int temp = dp[j];
+      if (a[i - 1] == b[j - 1]) {
+        dp[j] = prev;
+      } else {
+        dp[j] = 1 + std::min({prev, dp[j], dp[j - 1]});
+      }
+      prev = temp;
+      if (dp[j] < rowMin) rowMin = dp[j];
+    }
+    if (rowMin > maxDist) return maxDist + 1;
+  }
+  return dp[n];
+}
+
+std::vector<std::string> Dictionary::findSimilar(const std::string& word, int maxResults) {
+  if (!indexLoaded || sparseOffsets.empty()) return {};
+
+  FsFile idx;
+  if (!Storage.openFileForRead("DICT", IDX_PATH, idx)) return {};
+
+  // Binary search to find the segment containing or nearest to the word
+  int lo = 0, hi = static_cast<int>(sparseOffsets.size()) - 1;
+  while (lo < hi) {
+    int mid = lo + (hi - lo + 1) / 2;
+    idx.seekSet(sparseOffsets[mid]);
+    std::string key = readWord(idx);
+    if (stardictCmp(key.c_str(), word.c_str()) <= 0) {
+      lo = mid;
+    } else {
+      hi = mid - 1;
+    }
+  }
+
+  // Scan entries from the segment before through the segment after the target
+  int startSeg = std::max(0, lo - 1);
+  int endSeg = std::min(static_cast<int>(sparseOffsets.size()) - 1, lo + 1);
+  idx.seekSet(sparseOffsets[startSeg]);
+
+  int totalToScan = (endSeg - startSeg + 1) * SPARSE_INTERVAL;
+  int remaining = static_cast<int>(totalWords) - startSeg * SPARSE_INTERVAL;
+  if (totalToScan > remaining) totalToScan = remaining;
+
+  int maxDist = std::max(2, static_cast<int>(word.size()) / 3 + 1);
+
+  struct Candidate {
+    std::string text;
+    int distance;
+  };
+  std::vector<Candidate> candidates;
+
+  for (int i = 0; i < totalToScan; i++) {
+    std::string key = readWord(idx);
+    if (key.empty()) break;
+
+    uint8_t skip[8];
+    if (idx.read(skip, 8) != 8) break;
+
+    if (key == word) continue;
+    int dist = editDistance(key, word, maxDist);
+    if (dist <= maxDist) {
+      candidates.push_back({key, dist});
+    }
+  }
+
+  idx.close();
+
+  std::sort(candidates.begin(), candidates.end(),
+            [](const Candidate& a, const Candidate& b) { return a.distance < b.distance; });
+
+  std::vector<std::string> results;
+  for (size_t i = 0; i < candidates.size() && static_cast<int>(results.size()) < maxResults; i++) {
+    results.push_back(candidates[i].text);
+  }
+  return results;
+}

src/util/Dictionary.h

@@ -14,6 +14,8 @@ class Dictionary {
   static std::string lookup(const std::string& word, const std::function<void(int percent)>& onProgress = nullptr,
                             const std::function<bool()>& shouldCancel = nullptr);
   static std::string cleanWord(const std::string& word);
+  static std::vector<std::string> getStemVariants(const std::string& word);
+  static std::vector<std::string> findSimilar(const std::string& word, int maxResults = 6);
 
  private:
   static constexpr int SPARSE_INTERVAL = 512;
@@ -28,4 +30,5 @@ class Dictionary {
   static std::string searchIndex(const std::string& word, const std::function<bool()>& shouldCancel);
   static std::string readWord(FsFile& file);
   static std::string readDefinition(uint32_t offset, uint32_t size);
+  static int editDistance(const std::string& a, const std::string& b, int maxDist);
 };