Add helpful print statements and fix isURL validation

frontend/lib/utils/uri_utility.dart

@@ -2,11 +2,13 @@ class UriUtility {
   static bool isURL(String url) {
     // Validate if the URL string is empty, or contains spaces or invalid characters
     if (url.isEmpty || RegExp(r'[\s<>]').hasMatch(url)) {
+      print('URL is either empty or contains spaces/invalid characters.');
       return false;
     }
 
     // Check for 'mailto:' at the start of the URL
     if (url.startsWith('mailto:')) {
+      print('URL starts with "mailto:".');
       return false;
     }
 
@@ -15,26 +17,31 @@ class UriUtility {
     try {
       uri = Uri.parse(url);
     } catch (e) {
+      print('URL parsing failed: $e');
       return false;
     }
 
     // Validate the URL has a scheme (protocol) and host
     if (uri.scheme.isEmpty || uri.host.isEmpty) {
+      print('URL is missing a scheme (protocol) or host.');
       return false;
     }
 
     // Check if the URI has user info, which is not a common case for a valid HTTP/HTTPS URL
     if (uri.hasAuthority &&
-        (uri.userInfo.isEmpty ||
+        uri.userInfo.contains(':') &&
-            uri.userInfo.contains(':') && uri.userInfo.split(':').length > 2)) {
+        uri.userInfo.split(':').length > 2) {
+      print('URL contains invalid user info.');
       return false;
     }
 
     // Validate the port number if exists
     if (uri.hasPort && (uri.port <= 0 || uri.port > 65535)) {
+      print('URL contains an invalid port number.');
       return false;
     }
 
+    print('URL is valid.');
     return true;
   }
 }

frontend/lib/viewmodels/skill_tree_viewmodel.dart

@@ -266,6 +266,7 @@ class SkillTreeViewModel extends ChangeNotifier {
       run.runDetails.runId = uuid;
 
       await leaderboardService.submitReport(run);
+      print('Completed submission to leaderboard!');
     }
 
     // Clear the currentBenchmarkRuns list after submitting to the leaderboard

frontend/lib/views/task_queue/leaderboard_submission_dialog.dart

@@ -72,6 +72,7 @@ class _LeaderboardSubmissionDialogState
     }
 
     if (isValid) {
+      print('Valid leaderboard submission parameters!');
       _saveToSharedPreferences();
       widget.onSubmit?.call(_teamNameController.text, _repoUrlController.text,
           _commitShaController.text);