feat: Enable direct chat initiation from agent network, improve GIF rendering in chat, and fix message order and webview authentication.

lib/features/profile/presentation/screens/stripe_checkout_screen.dart

@@ -55,6 +55,12 @@ class _StripeCheckoutScreenState extends State<StripeCheckoutScreen> {
             }
             return NavigationDecision.navigate;
           },
+          onHttpAuthRequest: (request) {
+            // Handle auth challenge to prevent WKWebView null assertion crash
+            request.onProceed(
+              WebViewCredential(user: '', password: ''),
+            );
+          },
         ),
       )
       ..loadRequest(Uri.parse(widget.url));