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

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

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

app/admin/devices/page.tsx

@@ -343,6 +343,7 @@ export default function DevicesPage() {
                 </div>
               )}
             </div>
+          </div>
         })}
       </div>
 

app/admin/users/page.tsx

@@ -331,6 +331,8 @@ export default function UsersPage() {
                 </button>
               </div>
             )}
+            </div>
+          </div>
         ))}
       </div>