TW-2947: Handle invitation link web page and routing

lib/config/go_routes/go_router.dart

@@ -14,6 +14,7 @@ import 'package:fluffychat/pages/chat_draft/draft_chat_adaptive_scaffold.dart';
 import 'package:fluffychat/pages/chat_encryption_settings/chat_encryption_settings.dart';
 import 'package:fluffychat/pages/error_page/error_page.dart';
 import 'package:fluffychat/pages/homeserver_picker/homeserver_picker.dart';
+import 'package:fluffychat/pages/invitation_link_web/invitation_link_web.dart';
 import 'package:fluffychat/pages/login/on_auth_redirect.dart';
 import 'package:fluffychat/pages/new_group/new_group_chat_info.dart';
 import 'package:fluffychat/pages/personal_qr/personal_qr.dart';
@@ -119,6 +120,17 @@ abstract class AppRoutes {
         return defaultPageBuilder(context, const OnAuthRedirect());
       },
     ),
+    GoRoute(
+      path: '/chat/:matrixId',
+      redirect: loggedOutRedirect,
+      pageBuilder: (context, state) {
+        final matrixId = state.pathParameters['matrixId'];
+        return defaultPageBuilder(
+          context,
+          InvitationLinkWeb(matrixId: matrixId),
+        );
+      },
+    ),
     GoRoute(
       path: '/connect',
       pageBuilder: (context, state) =>

lib/pages/invitation_link_web/invitation_link_web.dart

@@ -0,0 +1,40 @@
+import 'package:fluffychat/utils/url_launcher.dart';
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+import 'package:linagora_design_flutter/linagora_design_flutter.dart';
+
+class InvitationLinkWeb extends StatefulWidget {
+  final String? matrixId;
+
+  const InvitationLinkWeb({super.key, this.matrixId});
+
+  @override
+  State<InvitationLinkWeb> createState() => _InvitationLinkWebState();
+}
+
+class _InvitationLinkWebState extends State<InvitationLinkWeb> {
+  @override
+  void initState() {
+    super.initState();
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      final matrixId = widget.matrixId;
+      if (matrixId == null || matrixId.isEmpty) {
+        context.go('/rooms');
+        return;
+      }
+      UrlLauncher(context, url: widget.matrixId).launchUrl();
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Center(
+        child: CupertinoActivityIndicator(
+          color: LinagoraSysColors.material().onSurfaceVariant,
+        ),
+      ),
+    );
+  }
+}