Add display_format config, fix restart command, clean up config code

- Add display_format option with get/set/list/unset for customizing track display
- Add Track::format() supporting $ARTIST, $ALBUM, $TRACK variables
- Update queue, status, notifications to use display_format
- Fix restart command using wrong subcommand 'start' -> 'start-daemon'
- Remove socket_path from config (now computed at runtime from XDG_RUNTIME_DIR)
- Consolidate duplicate save() and save_all() into single save()
- Fix redundant .clone().clone() in config.rs
- Add todo item for caching config in daemon hot paths

1 files changed, 4 insertions, 2 deletions

diff --git a/TODO.md b/TODO.md
index bdca569..c66ae50 100644
--- a/TODO.md
+++ b/TODO.md
@@ -60,6 +60,8 @@
 
 - [x] **Shuffle first song** - `update_shuffle_indices` now shuffles all indices when position is 0; directory playback uses `q.current()` instead of `files.first()`.
 
+- [x] **Customize status/notification display** - Added `display_format` config with `$ARTIST`, `$ALBUM`, `$TRACK` variables. Unified format for queue display, status, and notifications.
+
 ## Remaining Work
 
 ### Phase 1-3: Completed ✓
@@ -75,6 +77,6 @@
 
 - [ ] **Scrobbling (Last.fm/ListenBrainz)** - Add scrobbling support via configured credentials.
 
-- [ ] **Customize status display** - Variables like $ARTIST, $ALBUM, $TRACK available in config so `queue`, `status` and notifs can be customized
-
 - [ ] **Dynamic autocompletion of artists, albums and tracks** - Let shell communicate with the daemon so it returns autocompletions for shell
+
+- [ ] **Cache config in daemon** - Avoid repeated Config::load() calls in daemon hot paths; pass display_format through command chain instead