Major Update v1.4.0-release

**Features:**

- Enhanced UX for a Telegram-like experience

- Updated message and calling sounds, with special thanks to @Freakoverse for the audio

- Added support for CashuB tokens in the Cashu wallet

- Added support for 'input_fee_ppk' in the Cashu wallet

- Improved compatibility with Android 9

- Enabled support for 'kind 15' encrypted file messages

**Bug Fixes:**

- Fixed relay initialization to prevent occasional overwriting of the general relay list

- Resolved issue preventing call cancellation

- Corrected "ecash wallet keyset is invalid" error

- Fixed repeated prompts when sharing links on Android

- Fixed initial loading issue with group messages

- Fixed issues with link sharing on iOS 18

- Resolved stalling when loading video thumbnails on Android

- Corrected minor typos