Added a recording popup UI for the audio recording feature in the desktop app, improving the user experience when capturing audio from applications.
### What changed?
- Created a new popup window system for displaying recording controls
- Added a dedicated recording UI with start/stop controls and status indicators
- Moved audio encoding logic from the main app to a dedicated module
- Implemented smooth animations for popup appearance/disappearance
- Updated the recording workflow to show visual feedback during recording process
- Added internationalization support for recording-related text
- Modified the recording status flow to include new states: new, recording, stopped, ready
fix AF-2340
pengx17