⬆️ version to v0.3.41 — async queue sync refactoring

- Add `SyncCancelled` error variant for non-fatal cancellations
- Refactor queue sync to async via `MusicQueue::schedule_sync()`
  - Extract browse+conversion into internal helper
- Update all `QueueBackend::sync_queue()` signatures to accept cancel token and on_ready callback  
- Implement early-start logic (on pivot preservation or first insert)
 - Add `QueueReadyToPlay` and  ‘ QueueSyncCancelled➔ SSE events
- Replace blocking `refresh_attached_queue_for()` with non-blocking async dispatch in control_point.rs  
- Bump version to v0.3.41

pmocontrol/src/queue/mod.rs

@@ -7,20 +7,23 @@ mod snapshot;
 use std::sync::{Arc, Mutex};
 
 pub use backend::{EnqueueMode, QueueBackend};
-pub use music_queue::MusicQueue;
+pub use music_queue::{MusicQueue, SyncScheduleOutcome};
 pub use snapshot::{PlaybackItem, QueueSnapshot};
 
 // Internal queue implementations - not part of the public API
 pub(crate) use interne::InternalQueue;
 pub(crate) use openhome::OpenHomeQueue;
 
-use crate::{RendererInfo, errors::ControlPointError};
 use crate::music_renderer::time_utils::parse_time_flexible;
+use crate::{errors::ControlPointError, RendererInfo};
 
 /// Returns true if `new_dur` < `old_dur` (both parseable as HH:MM:SS/MM:SS/SS).
 /// Used to protect stream durations from decreasing for the same track.
 pub(super) fn stream_duration_decreased(old_dur: &str, new_dur: &str) -> bool {
-    match (parse_time_flexible(old_dur).ok(), parse_time_flexible(new_dur).ok()) {
+    match (
+        parse_time_flexible(old_dur).ok(),
+        parse_time_flexible(new_dur).ok(),
+    ) {
         (Some(old_secs), Some(new_secs)) => new_secs < old_secs,
         _ => false,
     }
@@ -28,7 +31,10 @@ pub(super) fn stream_duration_decreased(old_dur: &str, new_dur: &str) -> bool {
 
 /// Returns true if `new_dur` > `old_dur` (both parseable as HH:MM:SS/MM:SS/SS).
 pub(super) fn stream_duration_increased(old_dur: &str, new_dur: &str) -> bool {
-    match (parse_time_flexible(old_dur).ok(), parse_time_flexible(new_dur).ok()) {
+    match (
+        parse_time_flexible(old_dur).ok(),
+        parse_time_flexible(new_dur).ok(),
+    ) {
         (Some(old_secs), Some(new_secs)) => new_secs > old_secs,
         _ => false,
     }