enhanced security and input validation

lib/validate-input.ts

@@ -1,8 +1,7 @@
+import { sanitizeHtml, validateDomain } from './security'
+
 export function sanitizeUrl(url: string): string {
-  return url
-    .trim()
-    .replace(/[<>'"]/g, '') // Remove potential XSS characters
-    .substring(0, 2048) // Limit length
+  return sanitizeHtml(url.trim().substring(0, 2048))
 }
 
 export function validateEmail(email: string): boolean {