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/routes/player/[id]/+page.svelte

@@ -82,7 +82,7 @@
    * Replaces a bare URL string: the transport travels with it, so neither this
    * page nor VideoPlayer has to work out whether the URL is a playlist.
    *
-   * TRACES: UR-079 | DR-224
+   * TRACES: UR-079 | DR-225
    */
   let selection = $state<StreamSelection | null>(null);
   let mediaSourceId = $state<string | null>(null);
@@ -325,7 +325,7 @@
           //
           // A downloaded file is a direct play over a local transport, and Rust
           // says so rather than this page assuming it.
-          // TRACES: UR-071 | DR-137, DR-224
+          // TRACES: UR-071 | DR-137, DR-225
           selection = await commands.mediaLocalSelection(fullPath);
           videoNeedsTranscoding = false;
           // Use explicit startPosition, or fall back to retrieved progress from database
@@ -397,7 +397,7 @@
           // to stop it a moment later. Observed in the log as a pair of
           // `[StreamSelection]` lines for one play.
           //
-          // TRACES: UR-071 | DR-123, DR-137, DR-224
+          // TRACES: UR-071 | DR-123, DR-137, DR-225
           const localPath = await commands.playerLocalMediaPath(id);
           if (localPath) {
             // A downloaded file is a direct play over a local transport, served
@@ -413,7 +413,7 @@
             // the device profile and the ceiling in force, and returns the
             // transport and the media-source id with it. This page no longer
             // decides — or separately asks for — any of that.
-            // TRACES: UR-070, UR-079 | DR-224, DR-226, DR-227
+            // TRACES: UR-070, UR-079 | DR-225, DR-227, DR-228
             selection = await repo.getStreamSelection(id, null, null);
             mediaSourceId = selection.mediaSourceId;
             // Rust's own verdict — "which kinds count as transcoding" is a