Added new constant classes to timings.dart:
- ImageSizes: defaultSize (256), highRes (512), max (1024)
- VolumeConstants: min (0), max (100), range (100)
- PlayerStates: playing, paused, idle, off
- RepeatModes: off, all, one
Updated MusicAssistantProvider and QueueControls to use these
constants instead of magic numbers and string literals.
This improves code maintainability by:
- Eliminating magic numbers
- Providing single source of truth for common values
- Making code more self-documenting
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
