Fix JSX structure by adding missing closing div tags

Add closing div tags for relative wrapper elements:
- Close relative div in devices page card structure
- Close relative div in users page card structure

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

app/admin/devices/page.tsx

@@ -342,6 +342,7 @@ export default function DevicesPage() {
                   </button>
                 </div>
               )}
+            </div>
           </div>
         })}
       </div>