Features
- 11 new curated themes — SynthWave, Matrix, Amber Terminal, GameBoy, Doom, Nord, Catppuccin Mocha, Dracula, Gruvbox, One Dark, Tokyo Night (#229)
- Channel frequency labels in Prometheus metrics (#228)
Fixes
- Data export crash when error counts are None
- Error metrics omitted for channels without error data
- Backup list not showing in settings — load backups for module panel, accept array API response, parse ISO timestamps (#233)