test(chat): add regression guards for webc to React migration

[RSS1102]

为 packages/pro-components/chat 建立迁移前的回归守卫，用于验证 webc 迁移到纯 React 后 API 调用方式与 UI 行为不变。

• 新增 tests：覆盖单项 API、关键 API 组合、DOM 行为三类守卫
• helpers：shadow DOM 穿透查询与事件载荷解包，避免断言绑定当前实现
• setup：补齐 jsdom 缺失的 Constructable Stylesheets / ResizeObserver / scrollTo
• vitest：接入 setup 并内联 webc 依赖链，修复无扩展名导入导致的解析失败
• pnpm-workspace：显式包含 common 子包，修复 pnpm install 失败

当前 83 用例（80 passed / 3 skipped），3 条 skip 为迁移后验收项。

🤔 这个 PR 的性质是？

• 日常 bug 修复
• 新特性提交
• 文档改进
• 演示代码改进
• 组件样式/交互改进
• CI/CD 改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他

🔗 相关 Issue

💡 需求背景和解决方案

📝 更新日志

• 本条 PR 不需要纳入 Changelog

tdesign-react

@tdesign-react/chat

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充
• Changelog 已提供或无须提供

[github-actions]

Size Change: 0 B

Total Size: 76.3 kB

ℹ️ View Unchanged

Filename	Size
packages/tdesign-react-aigc/es/_util/reactify.js	2.99 kB
packages/tdesign-react-aigc/es/_util/useDynamicStyle.js	615 B
packages/tdesign-react-aigc/es/attachments/index.js	345 B
packages/tdesign-react-aigc/es/chat-actionbar/index.js	984 B
packages/tdesign-react-aigc/es/chat-engine/components/activity/index.js	378 B
packages/tdesign-react-aigc/es/chat-engine/components/activity/registry.js	454 B
packages/tdesign-react-aigc/es/chat-engine/components/activity/render.js	1.12 kB
packages/tdesign-react-aigc/es/chat-engine/components/activity/types.js	106 B
packages/tdesign-react-aigc/es/chat-engine/components/index.js	973 B
packages/tdesign-react-aigc/es/chat-engine/components/json-render/catalog/atomic/button.js	1.51 kB
packages/tdesign-react-aigc/es/chat-engine/components/json-render/catalog/atomic/card.js	1.01 kB
packages/tdesign-react-aigc/es/chat-engine/components/json-render/catalog/atomic/input.js	1.52 kB
packages/tdesign-react-aigc/es/chat-engine/components/json-render/catalog/atomic/layout.js	1.58 kB
packages/tdesign-react-aigc/es/chat-engine/components/json-render/catalog/atomic/text.js	997 B
packages/tdesign-react-aigc/es/chat-engine/components/json-render/catalog/catalog-to-prompt.js	7.53 kB
packages/tdesign-react-aigc/es/chat-engine/components/json-render/contexts/actions.js	2.94 kB
packages/tdesign-react-aigc/es/chat-engine/components/json-render/contexts/data.js	11.8 kB
packages/tdesign-react-aigc/es/chat-engine/components/json-render/contexts/index.js	428 B
packages/tdesign-react-aigc/es/chat-engine/components/json-render/contexts/store.js	954 B
packages/tdesign-react-aigc/es/chat-engine/components/json-render/contexts/tree.js	929 B
packages/tdesign-react-aigc/es/chat-engine/components/json-render/contexts/validation.js	2.05 kB
packages/tdesign-react-aigc/es/chat-engine/components/json-render/contexts/visibility.js	709 B
packages/tdesign-react-aigc/es/chat-engine/components/json-render/index.js	748 B
packages/tdesign-react-aigc/es/chat-engine/components/json-render/registry/a2ui-binding.js	2.1 kB
packages/tdesign-react-aigc/es/chat-engine/components/json-render/registry/a2ui-registry.js	1.48 kB
packages/tdesign-react-aigc/es/chat-engine/components/json-render/registry/config.js	517 B
packages/tdesign-react-aigc/es/chat-engine/components/json-render/registry/index.js	1.85 kB
packages/tdesign-react-aigc/es/chat-engine/components/json-render/renderer/_index.js	1.52 kB
packages/tdesign-react-aigc/es/chat-engine/components/json-render/renderer/A2UIJsonRenderActivityRenderer.js	3.5 kB
packages/tdesign-react-aigc/es/chat-engine/components/json-render/renderer/A2UISurface.js	2.71 kB
packages/tdesign-react-aigc/es/chat-engine/components/json-render/renderer/JsonRenderActivityRenderer.js	842 B
packages/tdesign-react-aigc/es/chat-engine/components/json-render/renderer/JsonUIRenderer.js	1.68 kB
packages/tdesign-react-aigc/es/chat-engine/components/json-render/types.js	106 B
packages/tdesign-react-aigc/es/chat-engine/components/json-render/utils/sanitize-props.js	933 B
packages/tdesign-react-aigc/es/chat-engine/components/provider/agent-state.js	430 B
packages/tdesign-react-aigc/es/chat-engine/components/shared/ComponentErrorBoundary.js	836 B
packages/tdesign-react-aigc/es/chat-engine/components/shared/createRegistry.js	942 B
packages/tdesign-react-aigc/es/chat-engine/components/shared/index.js	296 B
packages/tdesign-react-aigc/es/chat-engine/components/shared/useRegistrationListener.js	554 B
packages/tdesign-react-aigc/es/chat-engine/components/toolcall/index.js	459 B
packages/tdesign-react-aigc/es/chat-engine/components/toolcall/registry.js	457 B
packages/tdesign-react-aigc/es/chat-engine/components/toolcall/render.js	2.38 kB
packages/tdesign-react-aigc/es/chat-engine/components/toolcall/types.js	208 B
packages/tdesign-react-aigc/es/chat-engine/hooks/index.js	436 B
packages/tdesign-react-aigc/es/chat-engine/hooks/useAgentActivity.js	934 B
packages/tdesign-react-aigc/es/chat-engine/hooks/useAgentState.js	1.16 kB
packages/tdesign-react-aigc/es/chat-engine/hooks/useAgentToolcall.js	947 B
packages/tdesign-react-aigc/es/chat-engine/hooks/useChat.js	1.04 kB
packages/tdesign-react-aigc/es/chat-engine/index.js	1.19 kB
packages/tdesign-react-aigc/es/chat-filecard/index.js	345 B
packages/tdesign-react-aigc/es/chat-loading/index.js	351 B
packages/tdesign-react-aigc/es/chat-markdown/index.js	384 B
packages/tdesign-react-aigc/es/chat-message/index.js	358 B
packages/tdesign-react-aigc/es/chat-sender/index.js	349 B
packages/tdesign-react-aigc/es/chat-thinking/index.js	369 B
packages/tdesign-react-aigc/es/chatbot/index.js	393 B
packages/tdesign-react-aigc/es/index.js	1.37 kB
packages/tdesign-react-aigc/es/style/index.js	148 B

_{compressed-size-action::tdesign-react-chat}

[tdesign-bot]

TDesign Component Site Preview Open

Component	Preview
tdesign-react
@tdesign-react/chat

[pkg-pr-new]

• tdesign-react-demo

  npm i https://pkg.pr.new/tdesign-react@4408
  

  npm i https://pkg.pr.new/@tdesign-react/chat@4408
  

commit: 5173511

[github-actions]

Size Change: 0 B

Total Size: 938 kB

ℹ️ View Unchanged

Filename	Size
packages/tdesign-react/dist/reset.css	1.93 kB
packages/tdesign-react/dist/tdesign.css	61 kB
packages/tdesign-react/dist/tdesign.js	517 kB
packages/tdesign-react/dist/tdesign.min.css	55.2 kB
packages/tdesign-react/dist/tdesign.min.js	303 kB

_{compressed-size-action::tdesign-react}