mod: Phase 1 - bring forward mod-exclusive files with ActivityManager migration

Brings ~55 mod-exclusive files to the upstream-based mod/master-resync branch:

Activities (migrated to new ActivityManager pattern):
- Clock/Time: SetTimeActivity, SetTimezoneOffsetActivity, NtpSyncActivity
- Dictionary: DictionaryDefinitionActivity, DictionarySuggestionsActivity,
  DictionaryWordSelectActivity, LookedUpWordsActivity
- Bookmark: EpubReaderBookmarkSelectionActivity
- Book management: BookManageMenuActivity, EndOfBookMenuActivity
- OPDS: OpdsServerListActivity, OpdsSettingsActivity
- Utility: DirectoryPickerActivity, NumericStepperActivity

Utilities (unchanged):
- BookManager, BookSettings, BookmarkStore, BootNtpSync
- Dictionary, LookupHistory, TimeSync, OpdsServerStore

Libraries: PlaceholderCover, TableData, ChapterXPathIndexer
Scripts: inject_mod_version, generate_book_icon, preview_placeholder_cover
Docs: KOReader sync XPath mapping

Migration changes:
- ActivityWithSubactivity -> Activity base class
- Callback constructors -> finish()/setResult() pattern
- enterNewActivity() -> startActivityForResult()
- Activity::RenderLock&& -> RenderLock&&

These files won't compile yet - they reference mod settings and I18n
strings that will be added in subsequent phases.

Made-with: Cursor

chat-summaries/2026-02-15_17-30-summary.md

@@ -0,0 +1,52 @@
+# EPUB Table Rendering Implementation
+
+## Task
+Replace the `[Table omitted]` placeholder in the EPUB reader with full column-aligned table rendering, including grid lines, proportional column widths, and proper serialization.
+
+## Changes Made
+
+### New file
+- **`lib/Epub/Epub/TableData.h`** -- Lightweight structs (`TableCell`, `TableRow`, `TableData`) for buffering table content during SAX parsing.
+
+### Modified files
+
+- **`lib/Epub/Epub/ParsedText.h` / `.cpp`**
+  - Added `getNaturalWidth()` public method to measure the single-line content width of a ParsedText. Used by column width calculation.
+
+- **`lib/Epub/Epub/Page.h` / `.cpp`**
+  - Added `TAG_PageTableRow = 2` to `PageElementTag` enum.
+  - Added `getTag()` pure virtual method to `PageElement` base class for tag-based serialization.
+  - Added `PageTableCellData` struct (cell lines, column width, x-offset).
+  - Added `PageTableRow` class with render (grid lines + cell text), serialize, and deserialize support.
+  - Updated `Page::serialize()` to use `el->getTag()` instead of hardcoded tag.
+  - Updated `Page::deserialize()` to handle `TAG_PageTableRow`.
+
+- **`lib/Epub/Epub/parsers/ChapterHtmlSlimParser.h`**
+  - Added `#include "../TableData.h"`.
+  - Added table state fields: `bool inTable`, `std::unique_ptr<TableData> tableData`.
+  - Added `processTable()` and `addTableRowToPage()` method declarations.
+
+- **`lib/Epub/Epub/parsers/ChapterHtmlSlimParser.cpp`**
+  - Added table-related tag arrays (`TABLE_TRANSPARENT_TAGS`, `TABLE_SKIP_TAGS`).
+  - Replaced `[Table omitted]` placeholder with full table buffering logic in `startElement`.
+  - Modified `startNewTextBlock` to be a no-op when inside a table (cell content stays in one ParsedText).
+  - Added table close handling in `endElement` for `</td>`, `</th>`, and `</table>`.
+  - Disabled the 750-word early split when inside a table.
+  - Implemented `processTable()`: column width calculation (natural + proportional distribution), per-cell layout via `layoutAndExtractLines`, `PageTableRow` creation.
+  - Implemented `addTableRowToPage()`: page-break handling for table rows.
+
+## Design Decisions
+- Tables are buffered entirely during parsing, then processed on `</table>` close (two-pass: measure then layout).
+- Column widths are proportional to natural content width, with equal distribution of extra space when content fits.
+- Grid lines (1px) drawn around every cell; 2px horizontal cell padding.
+- Nested tables are skipped (v1 limitation).
+- `<caption>`, `<colgroup>`, `<col>` are skipped; `<thead>`, `<tbody>`, `<tfoot>` are transparent.
+- `<th>` cells get bold text. Cell text is left-aligned with no paragraph indent.
+- Serialization is backward-compatible: old firmware encountering the new tag will re-parse the section.
+
+## Follow-up Items
+- Nested table support (currently skipped)
+- `colspan` / `rowspan` support
+- `<caption>` rendering as centered text above the table
+- CSS border detection (currently always draws grid lines)
+- Consider CSS-based cell alignment