Lyrics and karaoke for the music player

- full-screen lyrics view that follows the song: highlighted current line with a colour sweep (word by word when the source has word timing), tap a line to jump, text size, timing nudge, 'Wrong lyrics?' search
- Karaoke mode: the current line large and centered
- lyrics from Plex first, then the bundled Lyrica service (LRCLIB, Musixmatch via Lrcmux, NetEase, Megalobiz); YouTube captions never used; wrong-length recordings refused; answers kept in /data/lyrics
- lyrica/: Lyrica pinned to one commit, built by the workflow as hub-lyrica; compose service sharing the hub's network
- tools/lyrics-test.js

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

.gitea/workflows/build.yml

@@ -21,6 +21,7 @@ jobs:
       - run: node tools/users-test.js   # accounts: private data, tab limits, invites, migration
       - run: node tools/plex-test.js    # Plex sign-in stays signed in and repairs itself
       - run: node tools/player-test.js  # music player: queue, shuffle/repeat, stall recovery
+      - run: node tools/lyrics-test.js  # lyrics: formats, wrong matches refused, remembered
       - run: node tools/signal-test.js  # Signal: linking, messages, sending, live updates
       - run: node tools/webmail-test.js # the /webmail/ pass-through to the bundled webmail (Cypht)
 
@@ -71,3 +72,21 @@ jobs:
           push: true
           tags: ${{ steps.meta_rc.outputs.tags }}
           labels: ${{ steps.meta_rc.outputs.labels }}
+
+      # The lyrics container (Lyrica, pinned)
+      - id: meta_ly
+        uses: docker/metadata-action@v5
+        with:
+          images: git.necloud.us/nate/hub-lyrica
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=sha,format=short
+            type=ref,event=tag
+
+      - uses: docker/build-push-action@v6
+        with:
+          context: ./lyrica
+          platforms: linux/amd64
+          push: true
+          tags: ${{ steps.meta_ly.outputs.tags }}
+          labels: ${{ steps.meta_ly.outputs.labels }}