fix: resolve end-of-book deadlock, long-press guards, archive UX, and home screen refresh

- Fix device freeze at end-of-book by deferring EndOfBookMenuActivity
  creation from render() to loop() (avoids RenderLock deadlock) in
  EpubReaderActivity and XtcReaderActivity
- Add initialSkipRelease to BookManageMenuActivity to prevent stale
  Confirm release from triggering actions when opened via long-press
- Add initialSkipRelease to MyLibraryActivity for long-press Browse
  Files -> archive navigation
- Thread skip-release through HomeActivity callback and main.cpp
- Fix HomeActivity stale cover buffer after archive/delete by fully
  resetting render state (freeCoverBuffer, firstRenderDone, etc.)
- Swap short/long-press actions in .archive context: short-press opens
  manage menu, long-press unarchives and opens the book
- Add deferred open pattern (pendingOpenPath) to wait for Confirm
  release before navigating to reader after unarchive
- Add BookManager::cleanupEmptyArchiveDirs() to remove empty parent
  directories after unarchive/delete inside .archive
- Add optional unarchivedPath output parameter to BookManager::unarchiveBook
- Restyle EndOfBookMenuActivity to standard list layout with proper
  header, margins, and button hints matching other screens
- Change EndOfBookMenuActivity back button hint to "« Back"
- Add Table of Contents option to EndOfBookMenuActivity

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

src/activities/reader/XtcReaderActivity.h

@@ -18,6 +18,7 @@ class XtcReaderActivity final : public ActivityWithSubactivity {
   int pagesUntilFullRefresh = 0;
 
   bool endOfBookMenuOpened = false;
+  bool pendingEndOfBookMenu = false;
   const std::function<void()> onGoBack;
   const std::function<void()> onGoHome;