Refactor code structure and remove redundant changes

src-old/lib/emailValidation.ts

@@ -0,0 +1,43 @@
+import { supabase } from '@/lib/supabaseClient';
+import { invokeWithTracking } from '@/lib/edgeFunctionTracking';
+import { handleNonCriticalError } from '@/lib/errorHandler';
+
+interface EmailValidationResult {
+  valid: boolean;
+  reason?: string;
+  suggestions?: string[];
+}
+
+/**
+ * Validates an email address against disposable email domains
+ * Uses the validate-email-backend edge function for server-side validation
+ */
+export async function validateEmailNotDisposable(email: string): Promise<EmailValidationResult> {
+  try {
+    const { data, error } = await invokeWithTracking(
+      'validate-email-backend',
+      { email },
+      undefined
+    );
+
+    if (error) {
+      handleNonCriticalError(error, {
+        action: 'Validate email backend',
+      });
+      return {
+        valid: false,
+        reason: 'Unable to validate email address. Please try again.'
+      };
+    }
+
+    return data as EmailValidationResult;
+  } catch (error: unknown) {
+    handleNonCriticalError(error, {
+      action: 'Validate email disposable',
+    });
+    return {
+      valid: false,
+      reason: 'Unable to validate email address. Please try again.'
+    };
+  }
+}