restore(mobile): restore mobile/ directory to pre-d2217531 state

Restored mobile/ from d22175310a711e7ebdd8062ae29a54f0136dc3f6^
(parent commit d94e9ca4bc).

Commit d22175310a (google-labs-jules[bot], 2026-03-23T14:45:22Z) introduced
an SSRF security fix for IMAP connections but unintentionally deleted or
truncated a large number of files across the repository, including 24 files
under mobile/.

This commit targets only the mobile/ directory and restores the following
files to their pre-d2217531 state:

- mobile/README.md
- mobile/app.json
- mobile/app/(tabs)/_layout.tsx
- mobile/app/(tabs)/file-detail.tsx  (re-added)
- mobile/app/+not-found.tsx          (re-added)
- mobile/app/_layout.tsx
- mobile/eslint.config.js            (re-added)
- mobile/package-lock.json
- mobile/package.json
- mobile/src/context/ShareContext.tsx
- mobile/src/i18n/de.json            (re-added)
- mobile/src/i18n/en.json            (re-added)
- mobile/src/i18n/es.json            (re-added)
- mobile/src/i18n/fr.json            (re-added)
- mobile/src/i18n/index.ts           (re-added)
- mobile/src/i18n/it.json            (re-added)
- mobile/src/screens/FileDetailScreen.tsx (re-added)
- mobile/src/screens/FilesScreen.tsx
- mobile/src/screens/LoginScreen.tsx
- mobile/src/screens/ProfileScreen.tsx
- mobile/src/screens/UploadScreen.tsx
- mobile/src/screens/WelcomeScreen.tsx
- mobile/src/services/api.ts
- mobile/src/utils/mimeTypes.ts      (re-added)
- mobile/src/utils/normalizeUri.ts   (re-added)

Security fixes introduced by d2217531 that are unrelated to mobile/
(IMAP SSRF fix in app/utils/network.py and app/tasks/imap_tasks.py)
are preserved — this restore targets only files under mobile/.

mobile/package.json

@@ -8,7 +8,7 @@
     "android": "expo start --android",
     "ios": "expo start --ios",
     "web": "expo start --web",
-    "lint": "eslint src --ext .ts,.tsx",
+    "lint": "eslint src",
     "type-check": "tsc --noEmit",
     "build:ios": "eas build --platform ios",
     "build:android": "eas build --platform android",
@@ -36,6 +36,7 @@
     "expo-image-manipulator": "~14.0.8",
     "expo-image-picker": "~17.0.10",
     "expo-linking": "~8.0.11",
+    "expo-localization": "~17.0.8",
     "expo-notifications": "~0.32.16",
     "expo-router": "~6.0.23",
     "expo-secure-store": "~15.0.8",
@@ -53,7 +54,7 @@
   "devDependencies": {
     "@babel/core": "^7.24.0",
     "@types/react": "~19.1.0",
-    "eslint": "^8.57.0",
+    "eslint": "^9.0.0",
     "eslint-config-expo": "~10.0.0",
     "typescript": "^5.3.0"
   },