feat(mobile): Skia wave, wave player view, themes and playback settings (M5)

- My Wave is rendered with react-native-skia on the UI thread; physics
  and colour helpers moved to @pipu/core (wave-anim) and shared with web.
- Full-screen player honours ui_prefs.mobile_player (cover / wave).
- Theme switching (dark / light / system) via a theme context and
  useColors() across all screens.
- Profile: theme, wave variant, player view, sound quality sheet
  (Wi-Fi / mobile / downloads), recent-tracks cache clearing on next
  cold start, and a change-password sheet.

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

packages/i18n/locales/en/common.json

@@ -231,6 +231,21 @@
     "dl_retry": "Retry failed",
     "dl_empty": "Download tracks, albums and likes to listen without a connection",
     "dl_pending_few": "{{count}} tracks queued",
-    "dl_pending_many": "{{count}} tracks queued"
+    "dl_pending_many": "{{count}} tracks queued",
+    "player_view": "Player view",
+    "player_cover": "Cover",
+    "player_wave": "Wave",
+    "quality": "Sound quality",
+    "quality_wifi": "On Wi-Fi",
+    "quality_cellular": "On mobile data",
+    "quality_download": "Downloads",
+    "quality_hint": "The new quality applies to the next tracks; downloaded tracks are not re-downloaded.",
+    "q_original": "Original",
+    "q_high": "High",
+    "q_medium": "Medium",
+    "q_low": "Low",
+    "cache": "Recent tracks cache",
+    "cache_clear": "Clear ({{size}} MB)",
+    "cache_pending": "Will be cleared on next launch"
   }
 }