Add post status change notifications and set up Git push

Installs `expo-notifications` and `expo-task-manager` packages. Implements a `useNotifications` hook for requesting permissions, polling for post status changes, and sending local notifications for published or errored posts. Updates `app.json` to include notification permissions and the notification handler. Wires the `useNotifications` hook into the app's root layout.

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artifacts/postiz-mobile/app.json

@@ -24,7 +24,9 @@
       "permissions": [
         "READ_EXTERNAL_STORAGE",
         "WRITE_EXTERNAL_STORAGE",
-        "READ_MEDIA_IMAGES"
+        "READ_MEDIA_IMAGES",
+        "RECEIVE_BOOT_COMPLETED",
+        "VIBRATE"
       ]
     },
     "web": {
@@ -40,7 +42,15 @@
       "expo-font",
       "expo-web-browser",
       "expo-image-picker",
-      "expo-secure-store"
+      "expo-secure-store",
+      [
+        "expo-notifications",
+        {
+          "icon": "./assets/images/icon.png",
+          "color": "#6366F1",
+          "sounds": []
+        }
+      ]
     ],
     "experiments": {
       "typedRoutes": true,