Implement note-based playlist auto-sync and multi-song playlist operations

[Copilot]

Playlists and user notes were conceptually the same but operated independently. Songs with matching notes should form automatic playlists.

Changes

Note-based playlist synchronization

• Added SyncPlaylistFromUserNote() - finds all songs with matching note text and upserts playlist named "Note: {text}"
• Hooked into SaveUserNoteToSong() to auto-trigger sync on note creation
• Playlist membership stays in sync with note additions/removals

Bulk playlist operations

• Added AddSelectedSongsToPlaylist() RelayCommand for toolbar/UI binding
• Delegates to existing AddToPlaylist() infrastructure

Resource management improvements

• using statements for Realm instances
• AddRange() for batch operations vs. iterative adds

Example

// User adds note to songs
await SaveUserNoteToSong(song1, "Workout");
await SaveUserNoteToSong(song2, "Workout");
await SaveUserNoteToSong(song3, "Workout");

// Playlist "Note: Workout" automatically created/updated with all three songs
// No manual playlist management needed

Testing

• 6 unit tests covering playlist creation, note assignment, and sync behavior
• Validates Realm query correctness and backlink relationships

Warning

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Add custom playlist</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

@YBTopaz8 Technically, custom playlists are already a thing :) @YBTopaz8 We there is a playlist model and we have usernotes, my personal opinion is they are one and the same

Because a group of songs with the same usernote is a playlist.

At the same time, each time user clicks on a song to play a playlist model is saved/updated having the list of songs and the TQL used.
So we have different paths here.

1. A user can traditionally create a playlist by opening a UI , adding a name and songs in then saving.
2. Selecting songs from any page and tapping on a toolbar btn letting them add to playlist
3. Add a note to a song and that will trigger a playlist UpSert whereby, we create a playlist with unique id and such id and primarykey is the user note so, no duplicates. If missing , we create a realm playlist object, add the song(s) in as list so we can have an iqueryable in song model to ensure backlinks work.

This could be good as such! </comment_new>

• Fixes Add custom playlist #175

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