fix: make task IDs selectable and copyable with feedback

apps/showcase_ui/src/app/components/agent-stream/agent-stream.component.html

@@ -124,7 +124,7 @@ limitations under the License.
               {{ session.initial_goal || '未命名任务' }}
             </div>
             <div class="item-footer">
-              <span class="item-id" [title]="session.session_id">ID: {{ session.session_id }}</span>
+              <app-task-id-copy [taskId]="session.session_id" />
               <span class="item-date">{{ session.start_time * 1000 | date:'MM/dd/yy' }}</span>
             </div>
           </div>