- Add selection mode to PlayerQueue with long-press to select
- Disable inner navigation (title/artist) when selecting via TrackTile
- Show checkboxes only in selection mode
- Add selection AppBar behavior and bottom-sheet menu with: Select all, Add to playlist, Remove selected, Cancel
- Reuse existing PlaylistAddTrackDialog for bulk add
- Hide drag handle while in selection mode
Closes: # (implement multi-select queue feature)
* feat: add caching support with track metadata
* feat(settings): add cache music toggle
* fix(mobile): cache dir not open-able
* feat(local folder): add cache export/clear actions and size of the folder
* chore: ios deps upgrades
* chore: upgrade lint flutter version
* chore: lint secrets causing error
* cd: invalid value for env var
