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/home/MyLibraryActivity.h

@@ -21,6 +21,9 @@ class MyLibraryActivity final : public ActivityWithSubactivity {
   bool ignoreNextConfirmRelease = false;
   static constexpr unsigned long LONG_PRESS_MS = 700;
 
+  // Deferred open: wait for Confirm release before navigating to book
+  std::string pendingOpenPath;
+
   // Callbacks
   const std::function<void(const std::string& path)> onSelectBook;
   const std::function<void()> onGoHome;
@@ -28,16 +31,19 @@ class MyLibraryActivity final : public ActivityWithSubactivity {
   // Data loading
   void loadFiles();
   size_t findEntry(const std::string& name) const;
+  bool isInArchive() const;
 
   void openManageMenu(const std::string& bookPath);
+  void unarchiveAndOpen(const std::string& bookPath);
 
  public:
   explicit MyLibraryActivity(GfxRenderer& renderer, MappedInputManager& mappedInput,
                              const std::function<void()>& onGoHome,
                              const std::function<void(const std::string& path)>& onSelectBook,
-                             std::string initialPath = "/")
+                             std::string initialPath = "/", bool initialSkipRelease = false)
       : ActivityWithSubactivity("MyLibrary", renderer, mappedInput),
         basepath(initialPath.empty() ? "/" : std::move(initialPath)),
+        ignoreNextConfirmRelease(initialSkipRelease),
         onSelectBook(onSelectBook),
         onGoHome(onGoHome) {}
   void onEnter() override;