Fix JSX syntax errors in admin pages

Remove duplicate closing div tags that caused build errors:
- Fix devices page JSX structure
- Fix users page JSX structure

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/admin/devices/page.tsx

@@ -342,8 +342,7 @@ export default function DevicesPage() {
                   </button>
                 </div>
               )}
-            </div>
-          );
+          </div>
         })}
       </div>