feat: 客户端懒加载分块 — 重依赖（Univer/xterm/CodeMirror/Office）拆独立 bundle 按需下发（/sidebar/bundle 路由 + __dshChunks__ 注册表），核心启动仅 ~325KB

src/client/chunks/docx.tsx

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+/**
+ * Lazy chunk entry: the .docx preview (docx-preview + jszip). Built as
+ * `lib/client-docx.js` and registered under `dsh-better-sidebar/docx` —
+ * fetched only when a .docx is first opened (see chunk-loader.ts and
+ * docs/plans/2026-08-12-lazy-chunks-design.md). Never import this module
+ * from the core bundle: it pulls the office library into the startup path.
+ */
+export { DocxView } from '../docx-view.tsx'

src/client/chunks/editor.tsx

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+/**
+ * Lazy chunk entry: the code/markdown/html text editor (CodeMirror 6 + the
+ * language packages). Built as `lib/client-editor.js` and registered under
+ * `dsh-better-sidebar/editor` — fetched only when a text file is first
+ * opened (see chunk-loader.ts and docs/plans/2026-08-12-lazy-chunks-design.md).
+ * Never import this module from the core bundle: it pulls CodeMirror into
+ * the startup path.
+ */
+export { TextEditor } from '../TextEditor.tsx'

src/client/chunks/pptx.tsx

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+/**
+ * Lazy chunk entry: the .pptx preview (pptx-renderer). Built as
+ * `lib/client-pptx.js` and registered under `dsh-better-sidebar/pptx` —
+ * fetched only when a .pptx is first opened (see chunk-loader.ts and
+ * docs/plans/2026-08-12-lazy-chunks-design.md). Never import this module
+ * from the core bundle: it pulls the renderer into the startup path.
+ */
+export { PptxView } from '../PptxView.tsx'

src/client/chunks/terminal.tsx

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+/**
+ * Lazy chunk entry: the interactive terminal (xterm + fit addon). Built as
+ * `lib/client-terminal.js` and registered under
+ * `dsh-better-sidebar/terminal` — fetched only when a terminal tab is first
+ * opened (see chunk-loader.ts and docs/plans/2026-08-12-lazy-chunks-design.md).
+ * Never import this module from the core bundle: it pulls xterm (and its
+ * stylesheet) into the startup path.
+ */
+export { TerminalView } from '../TerminalView.tsx'

src/client/chunks/xlsx.tsx

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+/**
+ * Lazy chunk entry: the .xlsx preview (Univer family + SheetJS, several MB).
+ * Built as `lib/client-xlsx.js` and registered under
+ * `dsh-better-sidebar/xlsx` — fetched only when a .xlsx is first opened
+ * (see chunk-loader.ts and docs/plans/2026-08-12-lazy-chunks-design.md).
+ * Never import this module from the core bundle: it pulls Univer into the
+ * startup path.
+ */
+export { XlsxView } from '../xlsx-view.tsx'