feat(web): align the web UI with the design prototype

- Ambient background in the app shell: three drifting blurred blobs,
  the third one tinted with the current track's cover; can be turned off
  in settings and stays still with reduced motion.
- Island player variant (floating glass panel) next to the bar, chosen
  in settings; player source line ("Album · …", "My Wave"), reactions
  around the transport controls, queue drawer.
- Sidebar: like / dislike counters, pending uploads badge on Queue,
  admin Settings page holding the upload queue limits.
- Collection: header tile with kicker, underline tabs, time / number
  lead column with an equalizer for the current track, album column,
  dimmed dislikes with undo, Play all / Shuffle pills.
- Album: cover-tinted header and Play / Shuffle; artist: artist wave,
  Play and popular tracks (new GET /artists/{id}/top-tracks).

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

packages/i18n/locales/en/common.json

@@ -33,7 +33,8 @@
     "uploads": "Uploads",
     "suggest": "Suggest tracks",
     "my_uploads": "My uploads",
-    "upload_queue": "Upload queue"
+    "upload_queue": "Queue",
+    "admin_settings": "Settings"
   },
   "profile": {
     "menu": "Profile menu",
@@ -70,7 +71,17 @@
     "repeat_one": "Repeat track",
     "progress": "Position",
     "unavailable": "Track is unavailable — skipping",
-    "error": "Could not play the track"
+    "error": "Could not play the track",
+    "source_album": "Album · {{label}}",
+    "source_artist": "Artist · {{label}}",
+    "source_search": "Search · {{label}}",
+    "source_history": "History",
+    "source_likes": "Likes",
+    "source_dislikes": "Dislikes",
+    "source_wave": "My Wave",
+    "source_queue": "Queue",
+    "queue": "Queue",
+    "source_wave_seed": "Artist wave · {{label}}"
   },
   "settings": {
     "title": "Settings",
@@ -96,7 +107,13 @@
     "logout_all": "Sign out everywhere",
     "wave_variant": "Wave style",
     "wave_orb": "Orb",
-    "wave_liquid": "Liquid"
+    "wave_liquid": "Liquid",
+    "player_view": "Player style",
+    "player_bar": "Bar",
+    "player_island": "Island",
+    "ambient": "Ambient background",
+    "on": "On",
+    "off": "Off"
   },
   "form": {
     "show_password": "Show password",
@@ -146,7 +163,10 @@
     "col_duration": "Time",
     "back_home": "Back home",
     "artist": "Artist",
-    "album": "Album"
+    "album": "Album",
+    "play": "Play",
+    "artist_wave": "Artist wave",
+    "top_tracks": "Popular tracks"
   },
   "collection": {
     "title": "Collection",
@@ -161,7 +181,14 @@
     "empty_likes": "Tap the heart on tracks — they will gather here",
     "empty_dislikes": "Disliked tracks stay out of the wave. None so far",
     "play_all": "Play all",
-    "more": "Show more"
+    "more": "Show more",
+    "sub_history": "Everything you listened to, by day. Click a track to play it.",
+    "sub_likes_one": "{{count}} track · they shape My Wave the most",
+    "sub_likes_few": "{{count}} tracks · they shape My Wave the most",
+    "sub_likes_many": "{{count}} tracks · they shape My Wave the most",
+    "sub_likes_other": "{{count}} tracks · they shape My Wave the most",
+    "sub_dislikes": "These tracks never get into the wave or recommendations. Remove the dislike if you change your mind.",
+    "shuffle": "Shuffle"
   },
   "wave": {
     "title": "My Wave",