Install menu in Settings + logout icon + drawer install link

- Settings: Install section (Android APK, PWA, iOS soon, F-Droid soon)
- Logout: icon only (red door), no text
- Avatar: initials only, name in drawer
- Drawer: Install link to /settings#install
- Translations: install key in cs/he/ru/ua

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/tasks/messages/ru.json

@@ -114,7 +114,8 @@
     "saved": "Сохранено!",
     "profile": "Профиль",
     "appearance": "Внешний вид",
-    "user": "Пользователь"
+    "user": "Пользователь",
+    "install": "Установка"
   },
   "goals": {
     "title": "Цели",