fix(shared): 修复 CJK Markdown 行内渲染

[DeliciousBuding]

变更

• 使用 remark-cjk-friendly/parseOnly 修复 CJK 标点相邻的 emphasis 解析
• 仅对 source-confirmed GFM HTTP(S) 裸链接拆出中文尾标点，保留显式链接、百分号编码和配对 CJK 括号
• 以块级尾换行识别 code block，长 inline code 与源码跨行 code span 保持行内，并用 box-decoration-break: clone 保持换行片段背景/圆角
• 删除临时 dump 测试，补充 CJK、英文、GFM、安全与 inline/block 回归测试

根因与影响

CommonMark 的 delimiter flanking 规则会让 CJK 句末标点附近的 emphasis 失效；GFM 裸链接会把未识别的 CJK 句读继续吞入 URL；原有 <code> 组件又按长度和换行内容判断 block，导致长行内代码不能稳定换行展示。本修复集中在 shared Markdown renderer，Desktop/Web 共用。

验证

• app/shared: Vitest 165 files / 1264 tests passed
• app/shared: Markdown 定向测试 18/18 passed
• app/desktop: pnpm build passed（含 TypeScript + Vite）
• app/web: pnpm build passed（含 TypeScript + Vite）
• git diff --check passed
• shared 独立 pnpm lint 仍命中既有 story/test/demo 类型基线；本次文件无新增诊断，两个 consumer 的 TypeScript production build 均通过

Closes #1409

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📥 Commits

Reviewing files that changed from the base of the PR and between 4112867 and 1c2b858.

⛔ Files ignored due to path filters (1)

• app/pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (5)

• app/shared/package.json
• app/shared/src/ui/Markdown.module.css
• app/shared/src/ui/Markdown.test.tsx
• app/shared/src/ui/Markdown.tsx
• app/shared/src/ui/cjkRemarkPlugin.ts

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• Create PR with unit tests
• Commit unit tests in branch fix/cjk-markdown-rendering

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