v2.5.0 - accent bubbles and settings cleanup

Version 2.5.0 - accent-coloured chat bubbles and a tidier settings screen.

• Your sent messages now follow the accent colour you pick in Appearance, each accent a distinct light shade - so the choice finally shows in the chat.

• The app-lock delay is now a compact switch instead of a tall list.

• Settings cleanup - removed a few rarely-used options: copying the key to the clipboard, the file-size limit, and pausing update reminders.

• Removed the older, duplicate key verification; the security code from key rotation is the one to use.

Both phones stay compatible - no need to update together. Download and install the APK below (Android 8.0+).