- Decouple monolithic UI state into specialized scoped controllers and state holders:
    - `QueueSheetController` & `rememberQueueSheetState`: Handles queue visibility, dragging, and snapping logic.
    - `SheetVisualState`: Manages derived dimensions, translations, and dynamic corner radii.
    - `SheetThemeState`: Encapsulates album art color extraction and mini-player transition animations.
    - `SheetInteractionState`: Orchestrates vertical drag gestures and shape definitions.
    - `SheetOverlayState`: Tracks keyboard visibility, scrim alpha, and content visibility flags.
    - `SheetModalOverlayController`: Manages transient modal states for saving queues and song info.
- Extract functional components for lifecycle and gesture handling:
    - `PlayerSheetPredictiveBackHandler`: Isolates predictive back navigation logic.
    - `QueueSheetRuntimeEffects`: Handles side effects like haptic feedback and offset synchronization.
    - `rememberMiniPlayerDismissGestureHandler`: Simplifies creation of horizontal dismiss logic.
- Simplify `UnifiedPlayerSheet` by replacing inline logic with delegated calls to the new scoped components.

…state management.

- **Cast & Remote Playback**:
    - Rewrites `CastPlayer` with a command queueing and retry mechanism to handle remote operations asynchronously and prevent UI stalls.
    - Enhances `CastTransferStateHolder` with a recovery system for suspended sessions and an "alignment" logic to ensure the remote player starts on the correct song.
    - Implements deep audio MIME type detection (via file signature, `MediaExtractor`, and `MediaMetadataRetriever`) to ensure compatibility with Cast devices.
    - Extends `MediaFileHttpServerService` with support for `HEAD` requests, stream revisions (cache busting), and robust error handling for client disconnections.
    - Adds fallback logic to query `MediaStore` directly if a requested song is missing from the local repository during a Cast session.

- **UI & State Management**:
    - Refactors `UnifiedPlayerSheet` by extract logic into scoped state holders: `rememberCastSheetState`, `rememberFullPlayerVisualState`, `rememberPrewarmFullPlayer`, and `PlayerArtistNavigationEffect`.
    - Improves `CastBottomSheet` interaction by disabling the disconnect button during connection attempts and preventing redundant clicks on the active device.
    - Synchronizes lyrics loading and theme extraction with remote playback events in `PlayerViewModel`.

- **Data & Performance**:
    - Optimizes `MusicDao` by implementing a manual upsert strategy using `IGNORE` and `Update` to handle large metadata syncs more efficiently.
    - Enhances `SyncWorker` and `MediaStoreSongRepository` to extract and persist `MIME_TYPE` from MediaStore.
    - Adds `release()` calls to `CastPlayer` and `CastStateHolder` to prevent memory leaks during session transitions.