feat(auth): Add LDAP and SSO authentication support

lib/core/auth/webview_cookie_helper.dart

@@ -0,0 +1,33 @@
+import 'dart:io' show Platform;
+
+import 'package:flutter/foundation.dart';
+import 'package:webview_flutter/webview_flutter.dart';
+
+/// Check if WebView is supported on the current platform.
+///
+/// webview_flutter only supports iOS and Android.
+bool get isWebViewSupported =>
+    !kIsWeb && (Platform.isIOS || Platform.isAndroid);
+
+/// Helper for clearing WebView cookies on supported platforms.
+///
+/// This is isolated in its own file to prevent platform coupling issues
+/// when the webview_flutter package isn't available.
+class WebViewCookieHelper {
+  /// Clears all WebView cookies.
+  ///
+  /// Returns true if cookies were cleared, false if not supported or failed.
+  /// Checks platform support internally, so safe to call on any platform.
+  static Future<bool> clearCookies() async {
+    // Only supported on mobile platforms
+    if (!isWebViewSupported) return false;
+
+    try {
+      return await WebViewCookieManager().clearCookies();
+    } catch (e) {
+      // Silently fail - WebView may not be available
+      return false;
+    }
+  }
+}
+