HomeActivity: Add mod features on top of upstream ActivityManager pattern:
- Multi-server OPDS support (OpdsServerStore instead of single URL)
- Long-press recent book for BookManageMenuActivity
- Long-press Browse Files to open archive folder
- Placeholder cover generation for books without covers
- startActivityForResult pattern for manage menu
EpubReaderMenuActivity: Replace upstream menu items with mod menu:
- Add/Remove Bookmark, Lookup Word, Go to Bookmark, Lookup History
- Table of Contents, Toggle Orientation, Toggle Font Size
- Close Book, Delete Dictionary Cache
- Pass isBookmarked and currentFontSize to constructor
- Show current orientation/font size value inline
EpubReaderActivity: Add mod action handlers:
- Bookmark add/remove via BookmarkStore
- Go to Bookmark via EpubReaderBookmarkSelectionActivity
- Dictionary word lookup via DictionaryWordSelectActivity
- Lookup history via LookedUpWordsActivity
- Delete dictionary cache
- Font size toggle with section re-layout
- Close Book action
ActivityResult: Add fontSize field to MenuResult
Made-with: Cursor
