Add iOS privacy purpose strings and version display

- Add descriptive purpose strings for camera, photo library, and microphone
- Display app version and build number on profile screen
- Add email redirect URL for sign-up flow
- Update Android OAuth client configurations

🤖 Generated with [Claude Code](https://claude.com/claude-code)

apps/mobile/app.json

@@ -16,13 +16,17 @@
     "ios": {
       "supportsTablet": false,
       "bundleIdentifier": "com.sauci.app",
-      "buildNumber": "5",
+      "buildNumber": "20",
       "usesAppleSignIn": true,
       "infoPlist": {
         "UIBackgroundModes": [
           "remote-notification"
         ],
-        "NSFaceIDUsageDescription": "Sauci uses Face ID to unlock the app and keep your conversations private."
+        "NSFaceIDUsageDescription": "Sauci uses Face ID to unlock the app and keep your conversations private.",
+        "NSCameraUsageDescription": "Sauci uses your camera to take photos and videos that you can share privately with your partner in encrypted chat messages.",
+        "NSPhotoLibraryUsageDescription": "Sauci uses your photo library so you can select photos and videos to share privately with your partner in encrypted chat messages.",
+        "NSPhotoLibraryAddUsageDescription": "Sauci saves photos and videos from your partner's messages to your photo library when you tap the save button.",
+        "NSMicrophoneUsageDescription": "Sauci uses your microphone to record audio when you capture videos to share privately with your partner."
       }
     },
     "android": {
@@ -31,7 +35,7 @@
         "backgroundColor": "#1a1a2e"
       },
       "package": "com.sauci.app",
-      "versionCode": 12,
+      "versionCode": 17,
       "googleServicesFile": "./google-services.json",
       "permissions": [
         "RECEIVE_BOOT_COMPLETED",