fix(mobile): Prevents duplicate taps navigating to the same route twice (#1855)

mobile/lib/routing/duplicate_guard.dart

@@ -0,0 +1,17 @@
+import 'package:auto_route/auto_route.dart';
+import 'package:flutter/foundation.dart';
+
+/// Guards against duplicate navigation to this route
+class DuplicateGuard extends AutoRouteGuard {
+  DuplicateGuard();
+  @override
+  void onNavigation(NavigationResolver resolver, StackRouter router) async {
+    // Duplicate navigation
+    if (resolver.route.name == router.current.name) {
+      debugPrint('DuplicateGuard: Preventing duplicate route navigation for ${resolver.route.name}');
+      resolver.next(false);
+    } else {
+      resolver.next(true);
+    }
+  }
+}