Add scrobbling support (Last.fm + ListenBrainz) and rsp settings reload

- Full Last.fm API implementation with MD5 signing (track.updateNowPlaying, track.scrobble)
- Full ListenBrainz API implementation (/1/submit-listens for playing_now and single)
- ScrobbleState in daemon tracking track, start time, and unix timestamp per play
- Scrobble threshold: ≥30s play AND (≥half duration OR ≥4 min)
- Duration extraction from symphonia codec params into AudioMetadata and Track
- Token validation at daemon startup and on config change
- ListenBrainz token valid (user: Salmonium) command to re-read config from disk (avoids token in shell history)
- Desktop notifications for token validation results
- Empty-credential filtering (empty string = no-op)

1 files changed, 1 insertions, 1 deletions

diff --git a/TODO.md b/TODO.md
index c66ae50..d278d6d 100644
--- a/TODO.md
+++ b/TODO.md
@@ -75,7 +75,7 @@
 
 - [ ] **Persist queue state** - Save queue to disk so it survives daemon restarts.
 
-- [ ] **Scrobbling (Last.fm/ListenBrainz)** - Add scrobbling support via configured credentials.
+- [x] **Scrobbling (Last.fm/ListenBrainz)** - Full implementation with Last.fm API signing, ListenBrainz token auth, daemon integration, token validation, and `rsp settings reload`.
 
 - [ ] **Dynamic autocompletion of artists, albums and tracks** - Let shell communicate with the daemon so it returns autocompletions for shell