feat(web): player bar, playable track lists and Collection (M3)

- player bar with cover, like and dislike, previous / play / next,
  shuffle, repeat, seek bar and volume; PlayerProvider lives with the
  signed-in shell and restores the last track and position paused
- clicking a row (or Enter) plays the list from that track with its
  context (album, search, history, collection); the current track is
  highlighted and rows have a like button; a reaction refreshes lists
- Collection: history grouped by day with clearing, likes with "play
  all" and dislikes, all with paging; sidebar section
- events and playback state are flushed when the page is hidden;
  player timers survive StrictMode remounts

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

apps/web/src/widgets/AppShell.module.css

@@ -129,32 +129,6 @@
   animation: pipuIn 0.2s ease-out;
 }
 
-.player {
-  grid-area: player;
-  display: flex;
-  align-items: center;
-  gap: 14px;
-  padding: 0 20px;
-  border-top: 1px solid var(--line);
-  background: var(--bar-a);
-  backdrop-filter: blur(20px);
-}
-
-.cover {
-  display: grid;
-  place-items: center;
-  width: 52px;
-  height: 52px;
-  border-radius: 10px;
-  background: var(--surface2);
-  color: var(--text3);
-}
-
-.playerEmpty {
-  color: var(--text3);
-  font-size: 14px;
-}
-
 @media (max-width: 1023px) {
   .shell {
     grid-template-columns: 72px 1fr;
@@ -205,7 +179,4 @@
     padding: 20px 16px;
   }
 
-  .player {
-    padding: 0 16px;
-  }
 }