feat: 实现计划管理工具和进度条实时更新

- 添加 plan_step_add/remove/update 和 plan_summary_update 事件支持
- 添加 onPhaseProgress 回调，联动独立进度条组件
- 扩展 MessageSegment 接口支持 progress 类型
- 映射 phaseId (sim -> simulation) 适配进度条

src/utils/messageHandler.ts

@@ -288,6 +288,36 @@ async function handleUserMessageWithBackend(
             percentage: data.percentage,
           });
         },
+
+        onPhaseProgress: (phaseId, status) => {
+          // 发送阶段进度更新到 WebView
+          // 映射 phaseId: sim -> simulation
+          const stepMap: Record<string, string> = {
+            spec: "spec",
+            design: "design",
+            sim: "simulation",
+            done: "done",
+          };
+          const step = stepMap[phaseId] || phaseId;
+
+          if (status === "current") {
+            // 显示进度条并更新到当前步骤
+            panel.webview.postMessage({ type: "showProgress" });
+            panel.webview.postMessage({ type: "updateProgress", step });
+          } else if (status === "completed") {
+            // 更新到下一步（或完成）
+            const steps = ["spec", "design", "simulation", "done"];
+            const currentIndex = steps.indexOf(step);
+            if (currentIndex < steps.length - 1) {
+              panel.webview.postMessage({
+                type: "updateProgress",
+                step: steps[currentIndex + 1],
+              });
+            } else {
+              panel.webview.postMessage({ type: "completeProgress" });
+            }
+          }
+        },
       },
       mode,
       serviceTier  // 传递服务等级