Remove feedback messages to simplify design canvas layout

- Remove submission status message display
- Remove approval status messages (pending/approved/rejected)
- Keep layout cleaner and more focused on design controls

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/components/DesignCanvas.tsx

@@ -1435,31 +1435,6 @@ export default function DesignCanvas({ product }: { product: ProductDTO }) {
         )}
 
         <div className="flex flex-col gap-3">
-          {submissionMessage && (
-            <p className={`text-sm px-4 py-3 rounded border ${
-              submissionMessage.startsWith('✓')
-                ? 'text-green-700 bg-green-50 border-green-200'
-                : 'text-splash-pink bg-red-50 border-splash-pink/30'
-            }`}>
-              {submissionMessage}
-            </p>
-          )}
-          {approvalStatus === 'PENDING' && !submissionMessage && (
-            <p className="text-sm text-orange-600 bg-orange-50 border border-orange-200 px-4 py-3 rounded">
-              ⏳ Your design is pending admin approval. You'll receive an email when it's ready to add to your bag.
-            </p>
-          )}
-          {approvalStatus === 'APPROVED' && (
-            <p className="text-sm text-pine bg-green-50 border border-green-200 px-4 py-3 rounded">
-              ✓ Your design has been approved! You can now add it to your bag.
-            </p>
-          )}
-          {approvalStatus === 'REJECTED' && (
-            <p className="text-sm text-splash-pink bg-red-50 border border-splash-pink/30 px-4 py-3 rounded">
-              Your design needs changes. Check your messages for feedback.
-            </p>
-          )}
-
           <div className="flex items-center gap-4">
             <div className="flex items-center border border-ink">
               <button