Break down the monolithic Sidebar component into smaller, maintainable modules to improve readability and separation of concerns.
- Extract `NavItem`, `FolderItem`, and `AlbumItem` into dedicated UI components.
- Modularize domain logic by introducing `LibrarySection` and `AlbumSection`.
- Abstract complex drag-and-drop and ordering state into custom `useFolderOrdering` and `useAlbumOrdering` hooks.
- Move shared constants and types to a dedicated `types.ts` file.
LyAhn
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