docs(genui): fix playground links

.github/a2ui-catalog.instructions.md

@@ -56,6 +56,6 @@ For the built-in `DateTimeInput`, keep date-enabled default output as `YYYY-MM-D
 
 When changing A2UI README content under `packages/genui/a2ui` or `packages/genui/playground/examples`, keep the corresponding Chinese README in sync. Keep the `packages/genui/a2ui` entry READMEs focused on first-time developers, and move deeper package material into topic docs under `docs/` with matching Chinese versions. Keep the playground examples README self-contained unless a split is explicitly requested. The Chinese docs should preserve the same technical boundaries as the English docs: `@lynx-js/genui/a2ui` is the client renderer/store/catalog runtime, `genui a2ui` is build/setup tooling, and the Agent service plus transport adapter are owned by the embedding app.
 
-When adding A2UI website README link rewrites in `website/sidebars/genui.ts`, put longer relative paths before shorter substrings such as `./src/catalog/README.md`, otherwise `../src/catalog/README.md` can become a broken `./guide/...` URL. Keep generated README links to the `/genui` playground as external `https://lynxjs.org/genui` Markdown links; the toolbar/nav item should point at `/genui`, but Rspress dead-link checking treats Markdown `/genui` links as docs pages.
+When adding A2UI website README link rewrites in `website/sidebars/genui.ts`, put longer relative paths before shorter substrings such as `./src/catalog/README.md`, otherwise `../src/catalog/README.md` can become a broken `./guide/...` URL. Keep generated README links to the `/genui` playground as external `https://lynx-stack.dev/genui/` Markdown links; the toolbar/nav item should point at `/genui`, but Rspress dead-link checking treats Markdown `/genui` links as docs pages.
 
 When embedding an MCP App inside A2UI on Lynx, use the built-in `McpApp` frame wrapper: select `webUrl` or `url` from `SystemInfo.platform`, pass `mcpAppData` through frame `data` (with `global-props` only as compatibility input), and render the nested host with its embedded layout. Lynx `frame` hosts another Lynx bundle; it is not an HTML iframe sandbox, so bundle URLs and data must come from a host-registered trusted MCP Apps resource rather than agent-generated input. Do not rely on Web block layout to make a frame fill its container: make the wrapper an explicit column Flex container with stretched children, set `align-self: stretch` for Flex parents and `linear-layout-gravity: stretch` for Lynx Linear parents, keep `min-width: 0` on both the wrapper and frame, and retain an explicit inline `width: 100%` on the frame. Enable `auto-width` and `auto-height` when the frame should follow the nested page's reported content size; these attributes do not replace the parent-width stretch constraint. Lynx template encoding does not support the `inset` box-shadow keyword; use a real border with border-box sizing and account for its content-box reduction (for example, a 288 px wrapper with 1 px borders provides 286 px to the frame).

packages/genui/a2ui/README.md

@@ -110,4 +110,4 @@ generated UI actions through `onAction`.
 - [Overview and architecture](./docs/overview.md)
 - [Catalogs, built-ins, and custom components](./docs/catalog-guide.md)
 - [System prompts](./docs/system-prompts.md)
-- [Open the GenUI playground](https://lynxjs.org/genui)
+- [Open the GenUI playground](https://lynx-stack.dev/genui/)

packages/genui/a2ui/README_zh.md

@@ -100,4 +100,4 @@ async function sendPrompt(input: string) {
 - [概览与架构](./docs/overview_zh.md)
 - [Catalogs、内置组件与自定义组件](./docs/catalog-guide_zh.md)
 - [System Prompts](./docs/system-prompts_zh.md)
-- [打开 GenUI Playground](https://lynxjs.org/genui)
+- [打开 GenUI Playground](https://lynx-stack.dev/genui/)

packages/genui/a2ui/docs/catalog-guide.md

@@ -423,4 +423,4 @@ All of these are exported from `@lynx-js/genui/a2ui` (and from the
   responsibility split, and the export map.
 - [System prompts](./system-prompts.md) — generate the model instructions
   that pair an Agent with your catalog.
-- [Open the GenUI playground](https://lynxjs.org/genui) — try it live.
+- [Open the GenUI playground](https://lynx-stack.dev/genui/) — try it live.

packages/genui/a2ui/docs/catalog-guide_zh.md

@@ -393,4 +393,4 @@ MyChart.displayName = 'MyChart';
 - [概览与架构](./overview_zh.md)——一条 message 如何变成 UI、职责划分，以及
   export 映射。
 - [System Prompts](./system-prompts_zh.md)——生成让 Agent 与你的 catalog 配套的模型指令。
-- [打开 GenUI playground](https://lynxjs.org/genui)——在线体验。
+- [打开 GenUI playground](https://lynx-stack.dev/genui/)——在线体验。

packages/genui/a2ui/docs/overview.md

@@ -330,4 +330,4 @@ Lifecycle notes that save debugging time:
   the contract, add manifests, and register your own components.
 - [System prompts](./system-prompts.md) — generate the model instructions
   that pair an Agent with your catalog.
-- [Open the GenUI playground](https://lynxjs.org/genui) — try it live.
+- [Open the GenUI playground](https://lynx-stack.dev/genui/) — try it live.

packages/genui/a2ui/docs/overview_zh.md

@@ -286,4 +286,4 @@ MessageStore ──subscribe──► <A2UI> ──► MessageProcessor ──
 - [Catalogs、内置组件与自定义组件](./catalog-guide_zh.md)——组合 contract、加入
   manifest、注册你自己的组件。
 - [System Prompts](./system-prompts_zh.md)——生成让 Agent 与你的 catalog 配套的模型指令。
-- [打开 GenUI playground](https://lynxjs.org/genui)——在线体验。
+- [打开 GenUI playground](https://lynx-stack.dev/genui/)——在线体验。