Add About screen with 7-tap joelangel easter egg; fix deps

- About screen surfaces getAbout() content; tapping the title 7x reveals
  assets/joelangel.png (placeholder committed; replace with the real image)
- Correct UnifiedPush package to react-native-unifiedpush-connector (lazy-required)
- Fix expo-notifications NotificationBehavior (shouldShowAlert)
- Reachable via an ⓘ header button on the main tabs

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/app.json

@@ -26,12 +26,7 @@
           "locationWhenInUsePermission": "Show nearby parking meters on the map."
         }
       ],
-      [
-        "expo-notifications",
-        {
-          "icon": "./assets/notification-icon.png"
-        }
-      ],
+      "expo-notifications",
       [
         "react-native-vision-camera",
         {