Rescript

## Highlights

- The transcript editor is now accessible to screen readers via a dedicated text layer
- Auto-updater errors on the desktop app are now handled gracefully instead of crashing

## Changes

### Accessibility
- Added a screen-reader text layer to the transcript editor, making transcript content and speaker labels navigable with assistive technologies
- Updated localization strings across all supported languages (de, es, fr, ja, ko, pt, zh-CN, zh-TW) to support accessibility labels

### Desktop
- Caught unhandled promise rejections from the auto-updater's check and download operations, preventing silent failures or crashes when update checks fail