fix: md 预览代码块复制按钮跟随 DSH i18n（MarkdownText 补传 codeLabels）

AGENTS.md

@@ -407,7 +407,7 @@ interface BetterSidebarService {
 | **host 半无此服务** | `ctx.betterSidebar` 只在 client 侧存在；host 半需要 better-sidebar 数据走 `/sidebar/api/*` HTTP 路由 |
 | **portal 限制** | 整面板 slot 由 ui-layout 独占，外部 tab 只能进入 better-sidebar 的 portal 内部，无法全屏替换 |
 | **id 冲突** | `registerTab` / `registerFileViewer` 对重复 id 抛错；建议用包前缀（`my-plugin:xxx`） |
-| **i18n 跟随** | 侧边栏界面文案跟随 DSH 的 `ctx.locale`（`@deepseek-ai/dsh-client-locale`）：词典注册在 `betterSidebar` 命名空间，语言偏好（Host-backed `locale.preference`）与浏览器语言不一致时以 DSH 为准并实时切换；locale 服务缺失时回退浏览器语言。插件自身的 `t()`（`src/client/locales.ts`）由 `apply()` 挂接服务；消费插件**不要**依赖此内部函数——标题等字段传字符串或 `() => string` 即可（i18n 友好） |
+| **i18n 跟随** | 侧边栏界面文案跟随 DSH 的 `ctx.locale`（`@deepseek-ai/dsh-client-locale`）：词典注册在 `betterSidebar` 命名空间，语言偏好（Host-backed `locale.preference`）与浏览器语言不一致时以 DSH 为准并实时切换；locale 服务缺失时回退浏览器语言。插件自身的 `t()`（`src/client/locales.ts`）由 `apply()` 挂接服务；消费插件**不要**依赖此内部函数——标题等字段传字符串或 `() => string` 即可（i18n 友好）。⚠️ 渲染 DSH 的 `MarkdownText` 时必须传 `codeLabels={{ copyLabel: t('copy'), copiedLabel: t('copied') }}`——该组件 cordis-free，漏传则代码块复制按钮回退硬编码中文 |
 | **懒加载 chunk** | 内置重依赖（Univer/xterm/CodeMirror/pptx/docx）在独立 bundle（`lib/client-<name>.js`）中，经 `/sidebar/bundle` 路由按需下发；每个脚本把 factory 赋到插件自有全局注册表 `globalThis.__dshChunks__[<name>]`，由 `src/client/chunk-loader.ts` 用自定义 require（externals 经 `__DSH_MODULES__` seed 分支解析）物化——**不经过** `__ModuleLoader__` 注册；**核心 bundle 禁止静态 import `src/client/chunks/*`**（会把库拖回启动路径）；对消费插件透明——懒加载只作用于内置 descriptor，`component` 契约（`(props) => ReactNode` 纯渲染函数）不变 |
 
 ---

docs/plans/2026-08-12-follow-dsh-i18n-design.md

@@ -50,6 +50,11 @@ DSH 的 i18n 系统（`@deepseek-ai/dsh-client-locale`）：
 
 - 无。计划与实施一致。
 - 版本号随 v0.8.2 发版提交（`package.json` + `dsh.plugin.json`）。
+- v0.8.2 后补遗：md 预览（`TextEditor.tsx`）的代码块复制按钮文案——DSH 的
+  `MarkdownText`/`CodeBlock` 是 cordis-free 组件，未传 `codeLabels` 时回退到硬编码中文
+  「复制/复制成功」。修复为渲染时传入 `codeLabels={{ copyLabel: t('copy'), copiedLabel: t('copied') }}`
+  （对齐 DSH 聊天区 `AssistantMarkdown` 的做法），新增 `tests/markdown-copy-labels.spec.tsx`
+  钉住 zh/en 跟随。
 
 ## 验收
 

src/client/TextEditor.tsx

@@ -329,7 +329,15 @@ export function TextEditor(props: FileViewerProps) {
           onMouseUp={handlePreviewMouseUp}
           onScroll={hidePopup}
         >
-          <MarkdownText text={draft ?? content ?? ''} />
+          {/* The fence copy-button labels must come from this plugin's own
+              dictionary: the DSH MarkdownText/CodeBlock are cordis-free and
+              fall back to hardcoded Chinese otherwise (same pattern as the
+              chat's AssistantMarkdown). Render-time t() keeps them following
+              the active locale on live switches. */}
+          <MarkdownText
+            text={draft ?? content ?? ''}
+            codeLabels={{ copyLabel: t('copy'), copiedLabel: t('copied') }}
+          />
         </div>
       )}
       {html && mode === 'preview' && (

tests/markdown-copy-labels.spec.tsx

@@ -0,0 +1,73 @@
+/**
+ * Markdown preview copy-label spec: the fence copy buttons ("复制" / "Copy")
+ * must follow the DSH locale service through `codeLabels` — the DSH
+ * MarkdownText/CodeBlock are cordis-free and fall back to HARDCODED Chinese
+ * when the caller omits the labels, so TextEditor must pass its own
+ * dictionary copy (`t('copy')` / `t('copied')`), re-evaluated per render.
+ * Rendered with renderToString (the initial preview mode never mounts
+ * CodeMirror, so no DOM/effects are needed).
+ */
+import { describe, expect, it, afterEach } from 'vitest'
+import { renderToString } from 'react-dom/server'
+import { createElement } from 'react'
+import './browser-globals.ts'
+import { TextEditor } from '../src/client/TextEditor.tsx'
+import { createSidebarStore } from '../src/client/state.ts'
+import { attachLocale } from '../src/client/locales.ts'
+import type { FileViewerProps } from '../src/client/service.ts'
+
+/** Minimal structural fake of the DSH LocaleService face the sidebar uses. */
+class FakeLocale {
+  active: string = 'zh'
+  getSnapshot(): { active: string } {
+    return { active: this.active }
+  }
+  subscribe(_fn: () => void): () => void {
+    return () => {}
+  }
+  register(_ns: string, _locale: string, _dict: Record<string, string>): () => void {
+    return () => {}
+  }
+}
+
+const CTX = {} as Parameters<typeof TextEditor>[0]['ctx']
+
+/** A markdown source with one fenced code block (the copy-button surface). */
+const MD_WITH_FENCE = '```ts\nconst a = 1\n```'
+
+function viewerProps(overrides: Partial<FileViewerProps> = {}): FileViewerProps {
+  return {
+    ctx: CTX,
+    store: createSidebarStore(),
+    scope: { sessionId: 's1', cwd: '/p' },
+    path: '/p/a/README.md',
+    title: 'README.md',
+    viewerId: 'markdown',
+    content: MD_WITH_FENCE,
+    ...overrides,
+  }
+}
+
+afterEach(() => {
+  attachLocale(undefined)
+})
+
+describe('markdown preview code-block copy labels (DSH i18n following)', () => {
+  it('renders the fence copy button with the zh dictionary label by default', () => {
+    const locale = new FakeLocale()
+    locale.active = 'zh'
+    attachLocale(locale)
+    const html = renderToString(createElement(TextEditor, viewerProps()))
+    expect(html).toContain('复制')
+    expect(html).not.toContain('Copy')
+  })
+
+  it('follows the attached locale service live: en renders "Copy" instead of the zh label', () => {
+    const locale = new FakeLocale()
+    locale.active = 'en'
+    attachLocale(locale)
+    const html = renderToString(createElement(TextEditor, viewerProps()))
+    expect(html).toContain('Copy')
+    expect(html).not.toContain('复制')
+  })
+})