fix: placeholder cover text, indexing timing, TOC long-press, cache deletion UI

- Fix fp4 fixed-point misuse in PlaceholderCoverGenerator (advanceX is 12.4
  fixed-point, not pixels) causing only first letter of each word to render
- Remove duplicate silentIndexNextChapterIfNeeded() call from loop() that
  blocked UI before render, preventing the indexing indicator from showing
- Fix indexing icon Y position to align within the status bar
- Add ignoreNextConfirmRelease to EpubReaderChapterSelectionActivity so
  long-press confirm release doesn't immediately select the first TOC item
- Reload recent books after cache deletion in HomeActivity and clear stale
  ignoreNextConfirmRelease flag to fix "no open books" and double-press bugs

Made-with: Cursor

src/activities/reader/EpubReaderActivity.cpp

@@ -381,8 +381,6 @@ void EpubReaderActivity::loop() {
   } else {
     pageTurn(true);
   }
-
-  silentIndexNextChapterIfNeeded();
 }
 
 // Translate an absolute percent into a spine index plus a normalized position
@@ -454,8 +452,10 @@ void EpubReaderActivity::onReaderMenuConfirm(EpubReaderMenuActivity::MenuAction
     case EpubReaderMenuActivity::MenuAction::SELECT_CHAPTER: {
       const int spineIdx = currentSpineIndex;
       const std::string path = epub->getPath();
+      const bool consumeRelease = ignoreNextConfirmRelease;
       startActivityForResult(
-          std::make_unique<EpubReaderChapterSelectionActivity>(renderer, mappedInput, epub, path, spineIdx),
+          std::make_unique<EpubReaderChapterSelectionActivity>(renderer, mappedInput, epub, path, spineIdx,
+                                                              consumeRelease),
           [this](const ActivityResult& result) {
             if (!result.isCancelled && currentSpineIndex != std::get<ChapterResult>(result.data).spineIndex) {
               RenderLock lock(*this);
@@ -1203,7 +1203,7 @@ void EpubReaderActivity::renderStatusBar() const {
     if (SETTINGS.indexingDisplay == CrossPointSettings::INDEXING_DISPLAY::INDEXING_STATUS_TEXT) {
       renderer.drawText(SMALL_FONT_ID, indicatorX, textY, tr(STR_INDEXING));
     } else if (SETTINGS.indexingDisplay == CrossPointSettings::INDEXING_DISPLAY::INDEXING_STATUS_ICON) {
-      renderer.drawIcon(kIndexingIcon, indicatorX, textY - kIndexingIconSize + 2, kIndexingIconSize, kIndexingIconSize);
+      renderer.drawIcon(kIndexingIcon, indicatorX, textY + 2, kIndexingIconSize, kIndexingIconSize);
     }
   }
 }