feat(notifications): initialize Firebase Messaging and Capacitor push on native

Add firebaseMessagingClient to ensure the Firebase app is created from VITE_FIREBASE_*,
wire PushNotifications (listeners, requestPermissions, register) before token work,
and call getMessaging/getToken/onMessage when firebase/messaging is supported. Hook
startup from main.capacitor and set PushNotifications presentationOptions in
capacitor.config. Depend on firebase and @capacitor/push-notifications.

package.json

@@ -148,6 +148,7 @@
     "@capacitor/core": "^6.2.0",
     "@capacitor/filesystem": "^6.0.0",
     "@capacitor/ios": "^6.2.0",
+    "@capacitor/push-notifications": "^6.0.5",
     "@capacitor/share": "^6.0.3",
     "@capacitor/status-bar": "^6.0.2",
     "@capawesome/capacitor-file-picker": "^6.2.0",
@@ -194,6 +195,7 @@
     "electron-builder": "^26.0.12",
     "ethereum-cryptography": "^2.1.3",
     "ethereumjs-util": "^7.1.5",
+    "firebase": "^12.12.1",
     "jdenticon": "^3.2.0",
     "js-generate-password": "^0.1.9",
     "js-yaml": "^4.1.0",