feat(reader): copy read-later checklists

[oldwinter]

构建了什么：在现有“稍后读”面板里加入一个本地化的“复制 Markdown 清单”命令，把已保存笔记按顺序导出为 Obsidian 可直接粘贴的 - [ ] [标题](<绝对链接>) 列表；标题空白和 Markdown 特殊字符会被安全处理，空列表禁用命令，剪贴板成功与失败都有明确反馈。为什么觉得它会很酷/值得合并：它把浏览中的临时收藏一键变成可继续整理的任务清单，让数字花园与 Obsidian 工作流真正连起来，同时完全复用现有本地数据，不增加依赖、网络请求、存储格式或后台行为。

Validation

• 31/31 focused Read Later, render, and resource-registration tests passed at 091e40fe9eda9e7d4d88e22be608532e1a6f4d47.
• npx tsc --noEmit, scoped Prettier, git diff HEAD --check, and the clean-worktree check passed.
• Production npx quartz build passed with 314 inputs and 1912 outputs.
• Full suite: 242/243 passed; the only failure is the known undeclared jsdom import in local-plugins/theme-switcher/test/themeSwitcherScript.test.ts.
• Real Chromium QA passed empty/success/failure/retry states, exact two-entry payload, keyboard focus, 20-entry capacity, SPA navigation cleanup, 1280x900 desktop, and 390x844 dark/reduced-motion mobile with no horizontal overflow or browser errors.

Impact

• 9 existing Read Later render, script, storage, style, test, and locale files; 134 additions and 4 deletions.
• No dependency, lockfile, content, configuration, CI, deployment, infrastructure, permission, secret, analytics, cookie, or network changes.
• Existing dg3.readLater.v1 storage remains unchanged; exporting only reads the already parsed in-browser list.

Rollback

Revert 091e40fe9eda9e7d4d88e22be608532e1a6f4d47. Existing saved Read Later entries remain compatible because their storage schema was not changed.

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[netlify]

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