test: enhance deep link testing with real JWT examples

Changes:
- Add real JWT example for invite testing
- Add detailed JWT payload documentation
- Update test-deeplinks.sh with valid claim IDs
- Add test case for single contact invite
- Improve test descriptions and organization

This improves test coverage by using real-world JWT examples
and valid claim identifiers.

src/lib/capacitor/app.ts

@@ -4,7 +4,7 @@ import {
   App as CapacitorApp,
   AppLaunchUrl,
   BackButtonListener,
-} from '../../../node_modules/@capacitor/app';
+} from "../../../node_modules/@capacitor/app";
 import type { PluginListenerHandle } from "@capacitor/core";
 
 /**