fix: 工作空间面板定位、中文乱码、快捷键、帮助文档

- 工作空间面板 top 改用 CSS 变量 --nav-height，JS 动态计算 header+model-bar 实际高度
- Windows 下 spawn 子进程前加 chcp 65001 切换 UTF-8 代码页，修复中文乱码
- 补全 Ctrl+K（知识库）、Ctrl+M（记忆面板）快捷键，防止 Ctrl+M 默认行为冲突
- 帮助弹框内容全面更新，修正工作空间为常驻显示，补充 Ctrl+N、布局说明等
- Token 统计图标从 emoji 🪙 改为内联 SVG，兼容所有 Windows 字体

src/main/workspace.ts

@@ -88,21 +88,30 @@ export function startProcess(
   try {
     const isWin = process.platform === 'win32';
     const shell = isWin ? 'cmd.exe' : 'bash';
-    const shellArgs = isWin ? ['/c', command] : ['-c', command];
+    // Windows cmd 默认代码页为 GBK/CP936，中文输出会乱码
+    // chcp 65001 切换到 UTF-8 代码页，>nul 抑制 chcp 自身的输出
+    const actualCmd = isWin ? `chcp 65001 >nul && ${command}` : command;
+    const shellArgs = isWin ? ['/c', actualCmd] : ['-c', actualCmd];
     const proc = spawn(shell, shellArgs, {
       cwd: workDir,
-      env: { ...process.env, ...(isWin ? {} : { TERM: 'xterm-256color' }) },
+      env: {
+        ...process.env,
+        ...(isWin ? {} : { TERM: 'xterm-256color' }),
+        LANG: 'en_US.UTF-8',
+        LC_ALL: 'en_US.UTF-8',
+        PYTHONIOENCODING: 'utf-8'
+      },
       stdio: ['pipe', 'pipe', 'pipe']
     });
 
     activeProcesses.set(id, proc);
 
     proc.stdout.on('data', (data: Buffer) => {
-      onOutput('stdout', data.toString());
+      onOutput('stdout', data.toString('utf-8'));
     });
 
     proc.stderr.on('data', (data: Buffer) => {
-      onOutput('stderr', data.toString());
+      onOutput('stderr', data.toString('utf-8'));
     });
 
     proc.on('close', (code) => {
@@ -246,17 +255,24 @@ export function execWorkspaceCommand(
     try {
       const isWin = process.platform === 'win32';
       const shell = isWin ? 'cmd.exe' : 'bash';
-      const shellArgs = isWin ? ['/c', command] : ['-c', command];
+      const actualCmd = isWin ? `chcp 65001 >nul && ${command}` : command;
+      const shellArgs = isWin ? ['/c', actualCmd] : ['-c', actualCmd];
       const proc = spawn(shell, shellArgs, {
         cwd: workDir,
-        env: { ...process.env, ...(isWin ? {} : { TERM: 'xterm-256color' }) },
+        env: {
+          ...process.env,
+          ...(isWin ? {} : { TERM: 'xterm-256color' }),
+          LANG: 'en_US.UTF-8',
+          LC_ALL: 'en_US.UTF-8',
+          PYTHONIOENCODING: 'utf-8'
+        },
         stdio: ['pipe', 'pipe', 'pipe']
       });
 
       activeProcesses.set(cmdId, proc);
 
       proc.stdout.on('data', (data: Buffer) => {
-        const str = data.toString();
+        const str = data.toString('utf-8');
         if (stdoutBuf.length < MAX_OUTPUT) {
           stdoutBuf += str;
           if (stdoutBuf.length > MAX_OUTPUT) {
@@ -271,7 +287,7 @@ export function execWorkspaceCommand(
       });
 
       proc.stderr.on('data', (data: Buffer) => {
-        const str = data.toString();
+        const str = data.toString('utf-8');
         if (stderrBuf.length < MAX_OUTPUT) {
           stderrBuf += str;
           if (stderrBuf.length > MAX_OUTPUT) {