Add comprehensive keybind configuration system with persistence and UI

[Copilot]

New Features:

• Keybind Configuration System: Full support for customizable keyboard shortcuts covering playback, navigation, and UI controls

  • 27 actions: play/pause, next/prev, seek, volume, navigation to home/tracks/albums/shows, toggle lyrics/sidebar/finder, etc.
  • KeybindsConfig with serialization to config.json for persistence across sessions
  • KeyCombination struct handles key + modifier matching logic (Ctrl/Alt/Shift/Meta)

• Keybinds Settings Tab: New preferences section displaying all shortcuts organized by category

  • Read-only display of current keybinds with visual key combination badges
  • "Save Settings" button for explicit config persistence (CTO requirement)
  • "Reset to Default" button restores factory keybinds

• Global Keybind Controller: KeybindsController intercepts keyboard events and dispatches to configured actions

  • Coordinates with existing controllers (PlaybackController, NavController)
  • Non-invasive: defers to default handlers for core playback keys (Space, Arrows)

Improvements:

• Unified keyboard event handling through single controller layer
• Default keybinds follow common conventions (Ctrl+T for tracks, Ctrl+A for albums, Backspace for back, etc.)
• Architecture ready for future interactive keybind editing

Bug Fixes:

• N/A

Next Steps:

• Manual testing required: verify keybinds trigger correct actions across all contexts

• Consider adding keybind conflict detection when implementing interactive editing

• Consider adding visual feedback when keybind actions execute

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Original prompt

Implement keybinds functionality onto the settings view and make it customizable. Every action, every page, every single thing should be a keybind. Stuff like favourites page and home too. Save it onto the config file and add a button to save settings for CTO. Implement tests for each keybind and add a "reset to default" button next to the save button.

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