Extract queue module, add comprehensive tests, fix queue/play bugs

• Moved Queue, Track, ShuffleMode, AudioMetadata from daemon.rs into new src/queue.rs module with public API\n• Fixed rsp play <file> interrupting active playback (now checks is_playing)\n• Fixed directory play -n/-i inserting files in reverse order (now uses .iter().rev())\n• Removed dead duplicate shuffle handler in process_command\n• Fixed queue display showing (playing) when playback is stopped\n• Added 34 tests covering navigation, shuffle, insert ordering, edge cases, display

1 files changed, 1 insertions, 0 deletions

diff --git a/src/main.rs b/src/main.rs
index 2b88c44..aac80f0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,6 +4,7 @@ mod config;
 mod daemon;
 mod database;
 mod playback;
+mod queue;
 mod scrobbler;
 
 use clap::Parser;