test that flutter_rust_bridge works

package.json

@@ -10,6 +10,8 @@
     "build:desktop": "tauri build",
     "build:android": "tauri android build --debug",
     "install:android": "adb install -r src-tauri/gen/android/app/build/outputs/apk/universal/debug/app-universal-debug.apk",
+    "flutter": "cd flutter_app && flutter run",
+    "flutter:frb_codegen": "flutter_rust_bridge_codegen generate",
     "dev": "pnpm run -C src-react dev",
     "build": "pnpm run -C src-react build",
     "tauri": "tauri"