chore(traceability): shift this branch's ids clear of master's

Master allocated DR-224 and UT-211 while this branch was in flight — the third
collision on this work. Everything here moves up by one: DR-224..236 become
DR-225..237, UT-211..213 become UT-212..214. UR-079, UR-080 and IR-033 were
still free and are unchanged.

Mechanical, and matched on each row's own text rather than on its number, so a
row cannot be shifted twice or the wrong one caught. Master's DR-224 (the
background-audio toggle) and UT-211 are untouched.

src-tauri/src/player/media.rs

@@ -123,7 +123,7 @@ pub struct MediaItem {
     /// caller falls back to `needs_transcoding` — every transcode this app
     /// requests is HLS (DR-140), so that fallback is exact rather than a guess.
     ///
-    /// TRACES: UR-003, UR-004, UR-079 | DR-224, DR-229
+    /// TRACES: UR-003, UR-004, UR-079 | DR-225, DR-230
     #[serde(default)]
     pub transport: Option<crate::repository::Transport>,