feat: Integrate bookmark support into reader activities

Adds bookmark add/remove functionality to EpubReaderActivity and base
ReaderActivity, with visual indicator for bookmarked pages.

src/activities/reader/EpubReaderActivity.cpp

@@ -8,6 +8,7 @@
 #include <Serialization.h>
 
 #include "BookManager.h"
+#include "BookmarkStore.h"
 #include "CrossPointSettings.h"
 #include "CrossPointState.h"
 #include "EpubReaderChapterSelectionActivity.h"
@@ -17,6 +18,7 @@
 #include "activities/dictionary/DictionaryMenuActivity.h"
 #include "activities/dictionary/DictionarySearchActivity.h"
 #include "activities/dictionary/EpubWordSelectionActivity.h"
+#include "activities/util/QuickMenuActivity.h"
 #include "fontIds.h"
 
 namespace {
@@ -366,6 +368,149 @@ void EpubReaderActivity::loop() {
     return;
   }
 
+  // Quick Menu power button press
+  if (SETTINGS.shortPwrBtn == CrossPointSettings::SHORT_PWRBTN::QUICK_MENU &&
+      mappedInput.wasReleased(MappedInputManager::Button::Power)) {
+    xSemaphoreTake(renderingMutex, portMAX_DELAY);
+    
+    // Check if current page is bookmarked
+    bool isBookmarked = false;
+    if (section) {
+      const uint32_t contentOffset = section->getContentOffsetForPage(section->currentPage);
+      isBookmarked = BookmarkStore::isPageBookmarked(epub->getPath(), currentSpineIndex, contentOffset);
+    }
+    
+    exitActivity();
+    enterNewActivity(new QuickMenuActivity(
+        renderer, mappedInput,
+        [this](QuickMenuAction action) {
+          // Cache values before exitActivity
+          EpubReaderActivity* self = this;
+          GfxRenderer& cachedRenderer = renderer;
+          MappedInputManager& cachedMappedInput = mappedInput;
+          Section* cachedSection = section.get();
+          SemaphoreHandle_t cachedMutex = renderingMutex;
+          
+          exitActivity();
+          
+          if (action == QuickMenuAction::DICTIONARY) {
+            // Open dictionary menu
+            self->enterNewActivity(new DictionaryMenuActivity(
+                cachedRenderer, cachedMappedInput,
+                [self](DictionaryMode mode) {
+                  GfxRenderer& r = self->renderer;
+                  MappedInputManager& m = self->mappedInput;
+                  Section* s = self->section.get();
+                  SemaphoreHandle_t mtx = self->renderingMutex;
+                  
+                  self->exitActivity();
+                  
+                  if (mode == DictionaryMode::ENTER_WORD) {
+                    self->enterNewActivity(new DictionarySearchActivity(r, m,
+                        [self]() {
+                          self->exitActivity();
+                          self->updateRequired = true;
+                        }, ""));
+                  } else if (s) {
+                    xSemaphoreTake(mtx, portMAX_DELAY);
+                    auto page = s->loadPageFromSectionFile();
+                    if (page) {
+                      int mt, mr, mb, ml;
+                      r.getOrientedViewableTRBL(&mt, &mr, &mb, &ml);
+                      mt += SETTINGS.screenMargin;
+                      ml += SETTINGS.screenMargin;
+                      const int fontId = SETTINGS.getReaderFontId();
+                      
+                      self->enterNewActivity(new EpubWordSelectionActivity(
+                          r, m, std::move(page), fontId, ml, mt,
+                          [self](const std::string& word) {
+                            self->exitActivity();
+                            self->enterNewActivity(new DictionarySearchActivity(
+                                self->renderer, self->mappedInput,
+                                [self]() {
+                                  self->exitActivity();
+                                  self->updateRequired = true;
+                                }, word));
+                          },
+                          [self]() {
+                            self->exitActivity();
+                            self->updateRequired = true;
+                          }));
+                      xSemaphoreGive(mtx);
+                    } else {
+                      xSemaphoreGive(mtx);
+                      self->updateRequired = true;
+                    }
+                  } else {
+                    self->updateRequired = true;
+                  }
+                },
+                [self]() {
+                  self->exitActivity();
+                  self->updateRequired = true;
+                },
+                self->section != nullptr));
+          } else if (action == QuickMenuAction::ADD_BOOKMARK) {
+            // Toggle bookmark on current page
+            if (self->section) {
+              const uint32_t contentOffset = self->section->getContentOffsetForPage(self->section->currentPage);
+              const std::string& bookPath = self->epub->getPath();
+              
+              if (BookmarkStore::isPageBookmarked(bookPath, self->currentSpineIndex, contentOffset)) {
+                // Remove bookmark
+                BookmarkStore::removeBookmark(bookPath, self->currentSpineIndex, contentOffset);
+              } else {
+                // Add bookmark with auto-generated name
+                Bookmark bm;
+                bm.spineIndex = self->currentSpineIndex;
+                bm.contentOffset = contentOffset;
+                bm.pageNumber = self->section->currentPage;
+                bm.timestamp = millis() / 1000;  // Approximate timestamp
+                
+                // Generate name: "Chapter - Page X" or fallback
+                std::string chapterTitle;
+                const int tocIndex = self->epub->getTocIndexForSpineIndex(self->currentSpineIndex);
+                if (tocIndex >= 0) {
+                  chapterTitle = self->epub->getTocItem(tocIndex).title;
+                }
+                if (!chapterTitle.empty()) {
+                  bm.name = chapterTitle + " - Page " + std::to_string(self->section->currentPage + 1);
+                } else {
+                  bm.name = "Page " + std::to_string(self->section->currentPage + 1);
+                }
+                
+                BookmarkStore::addBookmark(bookPath, bm);
+              }
+            }
+            self->updateRequired = true;
+          } else if (action == QuickMenuAction::CLEAR_CACHE) {
+            // Navigate to Clear Cache activity
+            if (self->onGoToClearCache) {
+              xSemaphoreGive(cachedMutex);
+              self->onGoToClearCache();
+              return;
+            }
+            self->updateRequired = true;
+          } else if (action == QuickMenuAction::GO_TO_SETTINGS) {
+            // Navigate to Settings activity
+            if (self->onGoToSettings) {
+              xSemaphoreGive(cachedMutex);
+              self->onGoToSettings();
+              return;
+            }
+            self->updateRequired = true;
+          }
+        },
+        [this]() {
+          EpubReaderActivity* self = this;
+          exitActivity();
+          self->updateRequired = true;
+        },
+        isBookmarked));
+    xSemaphoreGive(renderingMutex);
+    return;
+  }
+
   const bool prevReleased = mappedInput.wasReleased(MappedInputManager::Button::PageBack) ||
                             mappedInput.wasReleased(MappedInputManager::Button::Left);
   const bool nextReleased = mappedInput.wasReleased(MappedInputManager::Button::PageForward) ||
@@ -632,6 +777,24 @@ void EpubReaderActivity::renderContents(std::unique_ptr<Page> page, const int or
                                         const int orientedMarginRight, const int orientedMarginBottom,
                                         const int orientedMarginLeft) {
   page->render(renderer, SETTINGS.getReaderFontId(), orientedMarginLeft, orientedMarginTop);
+  
+  // Draw bookmark indicator (folded corner) if this page is bookmarked
+  if (section) {
+    const uint32_t contentOffset = section->getContentOffsetForPage(section->currentPage);
+    if (BookmarkStore::isPageBookmarked(epub->getPath(), currentSpineIndex, contentOffset)) {
+      // Draw folded corner in top-right
+      const int screenWidth = renderer.getScreenWidth();
+      constexpr int cornerSize = 20;
+      const int cornerX = screenWidth - orientedMarginRight - cornerSize;
+      const int cornerY = orientedMarginTop;
+      
+      // Draw triangle (folded corner effect)
+      const int xPoints[3] = {cornerX, cornerX + cornerSize, cornerX + cornerSize};
+      const int yPoints[3] = {cornerY, cornerY, cornerY + cornerSize};
+      renderer.fillPolygon(xPoints, yPoints, 3, true);  // Black triangle
+    }
+  }
+  
   renderStatusBar(orientedMarginRight, orientedMarginBottom, orientedMarginLeft);
   if (pagesUntilFullRefresh <= 1) {
     renderer.displayBuffer(EInkDisplay::HALF_REFRESH);