Three focused features:
1. Real progress bar for encode/decode (polling + progress file)
2. Granular decode error messages (custom exceptions, specific UI feedback)
3. Mobile-responsive polish (touch targets, stacked layouts, camera hints)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>