feat: 新增会话压缩命令和上下文显示功能

- ICHelperPanel: 新增 compressConversation 命令处理，支持手动触发会话压缩
- ICHelperPanel: 在加载历史会话时设置 lastTaskId，确保压缩操作可用
- webviewContent: 新增 contextUsage 消息处理，更新上下文使用量显示
- userInteraction: 将用户回答超时时间从 5 分钟延长至 2 小时

src/panels/ICHelperPanel.ts

@@ -12,7 +12,9 @@ import {
   handlePlanAction,
   setPendingPlanExecution,
   getCurrentTaskId,
+  setLastTaskId,
 } from "../utils/messageHandler";
+import { compactDialog } from "../services/apiClient";
 import { VCDViewerPanel } from "./VCDViewerPanel";
 import { ChatHistoryManager } from "../utils/chatHistoryManager";
 import { MessageType } from "../types/chatHistory";
@@ -195,6 +197,39 @@ export async function showICHelperPanel(
         case "abortDialog":
           void abortCurrentDialog();
           break;
+        // 新增：压缩会话
+        case "compressConversation":
+          {
+            const taskId = getCurrentTaskId();
+            if (taskId) {
+              compactDialog(taskId)
+                .then((result) => {
+                  if (result.success) {
+                    panel.webview.postMessage({
+                      command: "receiveMessage",
+                      text: "✅ 会话压缩完成",
+                    });
+                  } else {
+                    panel.webview.postMessage({
+                      command: "receiveMessage",
+                      text: `❌ 压缩失败: ${result.error || "未知错误"}`,
+                    });
+                  }
+                })
+                .catch((err) => {
+                  panel.webview.postMessage({
+                    command: "receiveMessage",
+                    text: `❌ 压缩失败: ${err.message || "网络错误"}`,
+                  });
+                });
+            } else {
+              panel.webview.postMessage({
+                command: "receiveMessage",
+                text: "❌ 没有活跃的会话",
+              });
+            }
+          }
+          break;
         // 处理计划操作（只做模式切换，响应已通过 submitAnswer 发送）
         case "planAction":
           if (message.action === "confirm") {
@@ -528,6 +563,9 @@ async function selectConversation(
       return;
     }
 
+    // 设置 lastTaskId，用于压缩等操作
+    setLastTaskId(taskId);
+
     // 更新面板的任务映射，确保后续对话保存到正确的任务中
     const panelId = (panel as any).__uniqueId;
     historyManager.setPanelTask(panelId, taskId, workspacePath);