fix(mobile): edge-to-edge로 전환해 헤더/푸터 안전영역 정렬

- main: SystemUiMode.edgeToEdge + 내비게이션바 투명 → WebView가 시스템바 뒤까지
  전체 화면 차지 → 웹의 env(safe-area-inset-*) (viewport-fit=cover)가 실제값 수신
- webview: SafeArea top·bottom 모두 false (셸은 inset을 잡지 않고 웹 CSS가 처리)
  → 헤더 눌림/푸터 과다 여백 해소

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

android/app/google-services.json

@@ -0,0 +1,29 @@
+{
+  "project_info": {
+    "project_number": "332409988740",
+    "project_id": "special-partners-internal",
+    "storage_bucket": "special-partners-internal.firebasestorage.app"
+  },
+  "client": [
+    {
+      "client_info": {
+        "mobilesdk_app_id": "1:332409988740:android:33ded5b63cb6c1644ac4d1",
+        "android_client_info": {
+          "package_name": "com.specialpartners.spin"
+        }
+      },
+      "oauth_client": [],
+      "api_key": [
+        {
+          "current_key": "AIzaSyAzrtq093lZQacN9sDLpDyPrSSqDZMbQHc"
+        }
+      ],
+      "services": {
+        "appinvite_service": {
+          "other_platform_oauth_client": []
+        }
+      }
+    }
+  ],
+  "configuration_version": "1"
+}