fix: add error handling for launchUrl in About Us screen

The feedback link in about_us_screen.dart called launchUrl()
with no canLaunchUrl check or try/catch block. If the URL
fails to launch, this throws an unhandled exception and
crashes the app.

Added canLaunchUrl check consistent with how other links
in the same file are already handled.

Fixes #XXXX

Author: prajakta128

lib/view/about_us_screen.dart

@@ -135,7 +135,12 @@ class _AboutUsScreenState extends State<AboutUsScreen> {
                   style: const TextStyle(fontSize: 15),
                 ),
                 onTap: () async {
-                  await launchUrl(Uri.parse(appLocalizations.feedbackForm));
+                  final uri = Uri.parse(appLocalizations.feedbackForm);
+                  if (await canLaunchUrl(uri)) {
+                  await launchUrl(uri);
+                  } else {
+                  debugPrint('Could not launch ${appLocalizations.feedbackForm}');
+                  }
                 },
               ),
               const Divider(thickness: 0.5),