feat(mobile): sign-in, tabs, search, collection and background player (M5)

- expo-router app in src/app: connect (server check, recent servers),
  login, mandatory credential / password change, tabs Home / Search /
  Collection / Profile, album and artist pages, full-screen player
- AuthSession per server with the refresh token in expo-secure-store
  (Android Keystore); language from the profile
- player on react-native-track-player: ExoPlayer queue with a
  notification and lock-screen controls via a playback service, 500 MB
  stream cache, quality by network (Wi-Fi high, cellular medium),
  play events with played time, reactions, playback state restore and
  the endless My Wave with feedback
- home: pulsing wave circle driven by BPM / energy in the cover
  palette, activity and mood chips that switch the wave on the fly
- New Architecture is off until react-native-track-player supports it;
  the release build runs codegen only when it is on; query-string is a
  direct dependency because expo-router 5.1 imports it undeclared

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

packages/i18n/locales/en/common.json

@@ -184,5 +184,23 @@
       "calm": "Calm",
       "sad": "Sad"
     }
+  },
+  "mobile": {
+    "connect": "Connect",
+    "servers": "Recent servers",
+    "change_server": "Another server",
+    "server": "Server",
+    "open_admin": "Admin — opens in the browser",
+    "version": "App version {{version}}",
+    "offline": "No connection to the server",
+    "profile": "Profile",
+    "search": "Search",
+    "recent_searches": "Recent searches",
+    "clear_recent": "Clear",
+    "now_playing": "Now playing",
+    "open_player": "Open the player",
+    "close_player": "Collapse the player",
+    "queue": "Queue",
+    "forget_server": "Forget server"
   }
 }

packages/i18n/locales/ru/common.json

@@ -184,5 +184,23 @@
       "calm": "Спокойное",
       "sad": "Грустное"
     }
+  },
+  "mobile": {
+    "connect": "Подключиться",
+    "servers": "Недавние серверы",
+    "change_server": "Другой сервер",
+    "server": "Сервер",
+    "open_admin": "Админка — откроется в браузере",
+    "version": "Версия приложения {{version}}",
+    "offline": "Нет связи с сервером",
+    "profile": "Профиль",
+    "search": "Поиск",
+    "recent_searches": "Недавние запросы",
+    "clear_recent": "Очистить",
+    "now_playing": "Сейчас играет",
+    "open_player": "Открыть плеер",
+    "close_player": "Свернуть плеер",
+    "queue": "Очередь",
+    "forget_server": "Забыть сервер"
   }
 }