Fix AutoEQ headphone fetching and error recovery

- Fix URL encoding for headphone names with spaces/special characters
- Add "Back to List" button when fetch fails
- Clear error state when user types in search
- Consolidate all entries to oratory1990 source for reliability

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Add app icon and update project.yml for Ventura

- Add custom app icon (slider symbol on dark gradient)
- Update project.yml to macOS 13.0 deployment target
- Include icon generation script

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Bump version to 1.1.1-beta

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Mark version as 1.1.0-beta

Update README with correct repo URL