feat: 升级至 v0.2.3 — Token 估算优化、工具确认超时改进、工作空间标签页

1. Token 估算优化（核心改进）：新增 token-estimator.ts 智能字符估算（中文 1.5 token/字、ASCII 0.25 token/字），替换三处旧的 length/2 粗略估算，中文场景准确度从 ~50% 提升到 ~90%

2. 工具确认超时改进：超时时间可配置（30s~600s）、超时 toast 通知、ConfirmationDialog 倒计时 UI（进度条 + 最后 10 秒红色脉冲动画）、SettingsModal 新增配置入口

3. 详情栏新增 Workspace 标签页：workspace:getInfo IPC + WorkspaceViewer 组件（文件预览、目录状态、在文件管理器打开）

src/components/layout/DetailPanel.tsx

@@ -1,21 +1,22 @@
 /**
  * DetailPanel — 右侧详情面板
  *
- * 通过 Tab 切换显示 Trace / Memory / Tasks。
+ * 通过 Tab 切换显示 Trace / Memory / Tasks / Workspace。
  */
 
 import { useState } from 'react';
 import { Box, Tabs, Tab } from '@mui/material';
-import { Activity, Brain, ListChecks } from 'lucide-react';
+import { Activity, Brain, ListChecks, FolderOpen } from 'lucide-react';
 import { TraceViewer } from '@renderer/components/trace/TraceViewer';
 import { TokenUsage } from '@renderer/components/trace/TokenUsage';
 import { AgentMonitor } from '@renderer/components/layout/AgentMonitor';
 import { MemoryViewer } from '@renderer/components/memory/MemoryViewer';
 import { TaskList } from '@renderer/components/tasks/TaskList';
+import { WorkspaceViewer } from '@renderer/components/workspace/WorkspaceViewer';
 import { ErrorBoundary } from '@renderer/components/common/ErrorBoundary';
 import { LAYOUT } from '@renderer/lib/constants';
 
-type DetailTab = 'trace' | 'memory' | 'tasks';
+type DetailTab = 'trace' | 'memory' | 'tasks' | 'workspace';
 
 export function DetailPanel(): React.JSX.Element {
   const [tab, setTab] = useState<DetailTab>('trace');
@@ -42,6 +43,7 @@ export function DetailPanel(): React.JSX.Element {
         <Tab icon={<Activity size={12} />} iconPosition="start" label="Trace" value="trace" />
         <Tab icon={<Brain size={12} />} iconPosition="start" label="Memory" value="memory" />
         <Tab icon={<ListChecks size={12} />} iconPosition="start" label="Tasks" value="tasks" />
+        <Tab icon={<FolderOpen size={12} />} iconPosition="start" label="Workspace" value="workspace" />
       </Tabs>
 
       <Box sx={{ p: 1.5, flex: 1, display: 'flex', flexDirection: 'column', overflow: 'hidden', minHeight: 0 }}>
@@ -64,6 +66,11 @@ export function DetailPanel(): React.JSX.Element {
             <TaskList />
           </ErrorBoundary>
         )}
+        {tab === 'workspace' && (
+          <ErrorBoundary fallbackTitle="Workspace 渲染失败">
+            <WorkspaceViewer />
+          </ErrorBoundary>
+        )}
       </Box>
     </Box>
   );