feat: release 2.2.0 with PC-only tests and execution reliability fixes

Unify task scheduling and queue state, fix Android input and observation recovery, preserve screenshot paths, and match final review criteria accurately. Add collapsible copyable results and publish the complete 2.1.0 upgrade notes. Validation: 3189 backend tests, 326 frontend tests, 24 client tests, production build and quality gates.

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

@@ -747,9 +747,21 @@ limitations under the License.
                                           </div>
                                         }
                                         @for (param of getActionExtraParams(item.data); track trackParam($index, param)) {
-                                          <div class="grid-item">
+                                          <div class="grid-item" [class.full-width]="param.key === 'Result'">
                                             <span class="grid-label">{{ param.key }}</span>
-                                            <span class="grid-value code-pill">{{ param.value }}</span>
+                                            @if (param.key === 'Result') {
+                                              <div class="action-result-preview">{{ param.value | slice:0:180 }}{{ param.value.length > 180 ? '…' : '' }}</div>
+                                              <details class="action-result-detail">
+                                                <summary>
+                                                  <span class="result-expand-label">展开完整结果</span>
+                                                  <span class="result-collapse-label">收起结果</span>
+                                                  <span class="result-length">{{ param.value.length }} 字符</span>
+                                                </summary>
+                                                <pre tabindex="0" aria-label="完整操作结果，可选择复制">{{ param.value }}</pre>
+                                              </details>
+                                            } @else {
+                                              <span class="grid-value code-pill">{{ param.value }}</span>
+                                            }
                                           </div>
                                         }
                                         <!-- Fallback item if all detail fields are empty -->