Refine school script diagnostics and document-state capture

mobile/lib/features/school/school_browser.dart

@@ -2,6 +2,7 @@ import 'package:webview_flutter/webview_flutter.dart';
 import 'package:webview_flutter_android/webview_flutter_android.dart';
 
 import '../../services/diagnostic_log.dart';
+import 'school_browser_diagnostics.dart';
 
 class SchoolBrowserInfo {
   const SchoolBrowserInfo({this.chromiumVersion});
@@ -27,18 +28,9 @@ Future<SchoolBrowserInfo> configureSchoolBrowser(
       await cookies.setAcceptThirdPartyCookies(android, true);
     }
     await controller.setOnConsoleMessage((message) {
-      final text = message.message.toLowerCase();
-      final code = text.contains('mixed content')
-          ? 'mixed_content'
-          : text.contains('content security policy')
-          ? 'content_security_policy'
-          : text.contains('cors')
-          ? 'cross_origin'
-          : text.contains('refused to')
-          ? 'resource_refused'
-          : message.level == JavaScriptLogLevel.error
-          ? 'script_error'
-          : null;
+      final code =
+          schoolConsoleCode(message.message) ??
+          (message.level == JavaScriptLogLevel.error ? 'script_error' : null);
       if (code != null) {
         DiagnosticLog.instance.add(
           'school_console_error',