feat: added message "is submitting" and lock send button to avoid duplicates

Author: AlexVOiceover

src/components/statementWizard/steps/ComplementStep.tsx

@@ -1,16 +1,17 @@
-// src/components/statementWizard/steps/ComplementStep.tsx
 import React from 'react';
 import StepContainer from '../StepContainer';
 import { Button } from '../../ui/button';
 
 interface ComplementStepProps {
   onComplete: () => void;
   onBack: () => void;
+  isSubmitting?: boolean;
 }
 
 export const ComplementStep: React.FC<ComplementStepProps> = ({
   onComplete,
   onBack,
+  isSubmitting = false,
 }) => {
   const subQuestion = 'Add additional statement if needed';
   return (
@@ -21,8 +22,13 @@ export const ComplementStep: React.FC<ComplementStepProps> = ({
           later add custom statements to complement it.
         </p>
       </div>
-      <Button onClick={onComplete} variant='pink' className='mx-auto mt-4'>
-        Finish
+      <Button
+        onClick={onComplete}
+        variant='pink'
+        className='mx-auto mt-4'
+        disabled={isSubmitting}
+      >
+        {isSubmitting ? 'Submitting...' : 'Finish'}
       </Button>
     </StepContainer>
   );