feat: implement Google OAuth support for Android and iOS

- Added support for Google OAuth with separate client IDs for Android and iOS.
- Updated `verify_google_id_token` to validate `aud` against both client IDs and check `email_verified`.
- Modified `google_oauth_handler` to accept and process the new client IDs.
- Enhanced security by enforcing explicit JWT algorithm validation.
- Updated mobile app to handle Google OAuth flow using `expo-auth-session`.
- Fixed API request to send `id_token` in snake_case as expected by the backend.
- Added necessary environment variables for Google client IDs in mobile app.
- Implemented intent filter for Google OAuth redirect in AndroidManifest.xml.

mobile/package-lock.json

@@ -15,10 +15,13 @@
         "@react-navigation/native-stack": "^7.3.16",
         "axios": "^1.7.7",
         "expo": "~54.0.33",
+        "expo-auth-session": "~7.0.10",
         "expo-camera": "~17.0.10",
         "expo-constants": "~18.0.13",
+        "expo-crypto": "~15.0.8",
         "expo-file-system": "~19.0.21",
         "expo-font": "~14.0.11",
+        "expo-intent-launcher": "^55.0.8",
         "expo-linking": "~8.0.11",
         "expo-router": "~6.0.23",
         "expo-secure-store": "~15.0.8",
@@ -27,6 +30,7 @@
         "expo-sqlite": "~16.0.10",
         "expo-status-bar": "~3.0.9",
         "expo-system-ui": "~6.0.9",
+        "expo-web-browser": "~15.0.10",
         "react": "19.1.0",
         "react-dom": "19.1.0",
         "react-hook-form": "^7.53.0",
@@ -6024,6 +6028,33 @@
         "react-native": "*"
       }
     },
+    "node_modules/expo-auth-session": {
+      "version": "7.0.10",
+      "resolved": "https://registry.npmjs.org/expo-auth-session/-/expo-auth-session-7.0.10.tgz",
+      "integrity": "sha512-XDnKkudvhHSKkZfJ+KkodM+anQcrxB71i+h0kKabdLa5YDXTQ81aC38KRc3TMqmnBDHAu0NpfbzEVd9WDFY3Qg==",
+      "license": "MIT",
+      "dependencies": {
+        "expo-application": "~7.0.8",
+        "expo-constants": "~18.0.11",
+        "expo-crypto": "~15.0.8",
+        "expo-linking": "~8.0.10",
+        "expo-web-browser": "~15.0.10",
+        "invariant": "^2.2.4"
+      },
+      "peerDependencies": {
+        "react": "*",
+        "react-native": "*"
+      }
+    },
+    "node_modules/expo-auth-session/node_modules/expo-application": {
+      "version": "7.0.8",
+      "resolved": "https://registry.npmjs.org/expo-application/-/expo-application-7.0.8.tgz",
+      "integrity": "sha512-qFGyxk7VJbrNOQWBbE09XUuGuvkOgFS9QfToaK2FdagM2aQ+x3CvGV2DuVgl/l4ZxPgIf3b/MNh9xHpwSwn74Q==",
+      "license": "MIT",
+      "peerDependencies": {
+        "expo": "*"
+      }
+    },
     "node_modules/expo-camera": {
       "version": "17.0.10",
       "resolved": "https://registry.npmjs.org/expo-camera/-/expo-camera-17.0.10.tgz",
@@ -6058,6 +6089,18 @@
         "react-native": "*"
       }
     },
+    "node_modules/expo-crypto": {
+      "version": "15.0.8",
+      "resolved": "https://registry.npmjs.org/expo-crypto/-/expo-crypto-15.0.8.tgz",
+      "integrity": "sha512-aF7A914TB66WIlTJvl5J6/itejfY78O7dq3ibvFltL9vnTALJ/7LYHvLT4fwmx9yUNS6ekLBtDGWivFWnj2Fcw==",
+      "license": "MIT",
+      "dependencies": {
+        "base64-js": "^1.3.0"
+      },
+      "peerDependencies": {
+        "expo": "*"
+      }
+    },
     "node_modules/expo-file-system": {
       "version": "19.0.21",
       "resolved": "https://registry.npmjs.org/expo-file-system/-/expo-file-system-19.0.21.tgz",
@@ -6082,6 +6125,15 @@
         "react-native": "*"
       }
     },
+    "node_modules/expo-intent-launcher": {
+      "version": "55.0.8",
+      "resolved": "https://registry.npmjs.org/expo-intent-launcher/-/expo-intent-launcher-55.0.8.tgz",
+      "integrity": "sha512-MrgQoHC+2AGMDfwg+X+zF/lp0N2tIa7zVtMmPJksyAvOUpgZXN8B5IZaW8JLGSnFhNCYF3eEzJkQiUzXcgX7CA==",
+      "license": "MIT",
+      "peerDependencies": {
+        "expo": "*"
+      }
+    },
     "node_modules/expo-keep-awake": {
       "version": "15.0.8",
       "resolved": "https://registry.npmjs.org/expo-keep-awake/-/expo-keep-awake-15.0.8.tgz",
@@ -6474,6 +6526,16 @@
         }
       }
     },
+    "node_modules/expo-web-browser": {
+      "version": "15.0.10",
+      "resolved": "https://registry.npmjs.org/expo-web-browser/-/expo-web-browser-15.0.10.tgz",
+      "integrity": "sha512-fvDhW4bhmXAeWFNFiInmsGCK83PAqAcQaFyp/3pE/jbdKmFKoRCWr46uZGIfN4msLK/OODhaQ/+US7GSJNDHJg==",
+      "license": "MIT",
+      "peerDependencies": {
+        "expo": "*",
+        "react-native": "*"
+      }
+    },
     "node_modules/expo/node_modules/@expo/cli": {
       "version": "54.0.23",
       "resolved": "https://registry.npmjs.org/@expo/cli/-/cli-54.0.23.tgz",