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>

apps/web/src/pages/SettingsPage.tsx

@@ -114,6 +114,30 @@ function AppearanceSection() {
           ]}
         />
       </div>
+      <div className={s.settingRow}>
+        <span>{t('settings.player_view')}</span>
+        <Segmented<'bar' | 'island'>
+          label={t('settings.player_view')}
+          value={user.ui_prefs.web_player ?? 'bar'}
+          onChange={(v) => void setPrefs({ web_player: v })}
+          options={[
+            { value: 'bar', label: t('settings.player_bar') },
+            { value: 'island', label: t('settings.player_island') },
+          ]}
+        />
+      </div>
+      <div className={s.settingRow}>
+        <span>{t('settings.ambient')}</span>
+        <Segmented<'on' | 'off'>
+          label={t('settings.ambient')}
+          value={user.ui_prefs.ambient === false ? 'off' : 'on'}
+          onChange={(v) => void setPrefs({ ambient: v === 'on' })}
+          options={[
+            { value: 'on', label: t('settings.on') },
+            { value: 'off', label: t('settings.off') },
+          ]}
+        />
+      </div>
       <div className={s.settingRow}>
         <span>{t('language.label')}</span>
         <LanguageSwitch />