Export chats as images, inner thoughts, advanced backup

Export chat history as JPG, see inner thoughts, copy themes, and use advanced backup.

Export chat as JPG: message list "⋯" → Export history
Message analysis and inner thoughts: the heart button under online messages
Copy themes: Settings → Theme management → "Copy theme" / "Copy current theme"
Advanced backup: in Settings
Top search and "Load more" now work in story mode
Avatar and status bar colors adapt automatically
The message area fills the screen for a more immersive read