Fast lyric fitting for long videos; Search tab returns to the home screen while playing

- fitLyricLines measures text on a canvas with the line's own font and writes
  every --fit after measuring (it used an in-list DOM probe and wrote inside
  the loop, re-laying-out the whole list per line). 1200 lines: 600 ms -> 28 ms;
  sizes match the old method within 1 px. Service mode on long sermons with
  hundreds of transcribed lines opened slowly enough on phones to look broken.
- Bottom-nav Search while something plays shows the home screen (playlist
  board / hero) over the player pane; the media keeps playing unseen and the
  mini bar brings the player back (its close button too, so there is always a
  way back). Starting another video restores the player.

frontend/styles.css

@@ -4280,3 +4280,10 @@ body.landscape-fs .player-stage { touch-action: none; } /* fullscreen (real or t
 }
 .dl-act:hover { border-color: var(--accent); }
 .dl-act.danger:hover { border-color: #ff5a4f; color: #ff5a4f; }
+
+/* Home screen over a playing video (Search tab): media stays alive, unseen */
+.player-pane.home-over video,
+.player-pane.home-over #stageLyrics,
+.player-pane.home-over #artFallback { visibility: hidden; }
+.player-pane.home-over .related-panel { display: none; }
+.player-pane.home-over > :not(.player-stage) { display: none !important; }