* Add audio-only mode to hide video while keeping audio and captions
* Add read-it-later feature replacing save-as-archive
* Add MediaStyle notification with play/pause/stop/close for TTS
* Add EinkBro identifier to saved EPUBs and editable TOC with drag-and-drop
* Cache translated images to disk and batch translate all remaining images
* Improve dual caption reliability and translate-by-paragraph stability
* Fix pull-to-refresh intercepting two-finger swipe gestures
* Fix toolbar position switching crash
* Refactor: remove all layout XMLs, convert to Compose
* Enhanced TwoPaneLayout divider with drag handle
