feat: add and remove song from playlist

[nthpaul]

Summary

• adds playlist track management flows in TUI: add track to playlist and remove track from playlist from playlist contexts.
• adds shortcut support for quick add from the currently playing song and existing add/remove actions from track table contexts.
• adds dedicated dialogs for playlist picking (add) and confirmation (remove), including vim-style h/l navigation for confirmation buttons.
• wires new handler/network events through app state and updates help text/UI affordances for discoverability.
• updates playlist mutation behavior to avoid broad duplicate deletion by applying deterministic single-item removal semantics tied to the selected playlist position.

Testing

• /Users/ple/.cargo/bin/cargo fmt --all
• /Users/ple/.cargo/bin/cargo test -q network::tests -- --nocapture
• /Users/ple/.cargo/bin/cargo test -q

Additional notes

• playlist add uses the playlist items API path with uris payload.
• playlist remove validates selected row/position against current server data before mutation and then applies ordered playlist replacement in API-sized chunks.
• remove now preserves other duplicate occurrences of the same song by removing only the selected occurrence.
• if a playlist includes local or unavailable items that cannot be represented in mutation payloads, remove reports an actionable status error instead of silently mutating the wrong rows.

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

This PR adds comprehensive playlist track management functionality to the TUI, enabling users to add tracks to playlists and remove tracks from playlists with position-aware semantics.

Changes:

• Adds 'w' key binding to add selected/playing tracks to a playlist via an interactive picker dialog
• Adds 'W' global shortcut for quick-add of currently playing track
• Adds 'x' key binding to remove selected track from current playlist with confirmation dialog
• Implements position-based removal that preserves duplicate tracks by removing only the selected occurrence
• Adds error handling for local/unavailable tracks and playlist sync validation

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/app.rs	Adds state structures (PendingPlaylistTrackAdd, PendingPlaylistTrackRemoval), playlist_track_positions field, and begin_add_track_to_playlist_flow method
src/network.rs	Implements AddTrackToPlaylist and RemoveTrackFromPlaylistAtPosition IoEvents with full playlist fetching, position validation, and chunked replacement logic; adds position tracking in set_playlist_tracks_to_table and sorting
src/handlers/track_table.rs	Adds 'w' and 'x' handlers with playlist context validation and position resolution
src/handlers/playbar.rs	Adds 'w' handler and add_currently_playing_track_to_playlist function with episode filtering
src/handlers/dialog.rs	Refactors dialog handler to support AddTrackToPlaylistPicker and RemoveTrackFromPlaylistConfirm contexts with vim-style navigation
src/handlers/mod.rs	Adds global 'W' shortcut with input/dialog mode exclusion
src/handlers/empty.rs	Delegates 'w' to playbar handler when hovering over PlayBar
src/ui/mod.rs	Refactors draw_dialog to support multiple dialog contexts with dedicated picker and confirmation rendering functions
src/ui/help.rs	Adds help text entries for new keybindings

[LargeModGames]

This is amazing tysm!