feat: integrate typst preview & fix mermaid style (#14168)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Typst code block preview with interactive rendering controls (zoom,
pan, reset) and user-friendly error messages

* **Style**
  * Centered Mermaid diagram rendering for improved layout

* **Tests**
  * Added end-to-end preview validation tests for Typst and Mermaid

* **Chores**
* Added WebAssembly type declarations and updated frontend packages;
removed a build debug configuration entry

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settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

tools/utils/src/build-config.ts

@@ -54,7 +54,6 @@ export function getBuildConfig(
         CAPTCHA_SITE_KEY: process.env.CAPTCHA_SITE_KEY ?? '',
         SENTRY_DSN: process.env.SENTRY_DSN ?? '',
         MIXPANEL_TOKEN: process.env.MIXPANEL_TOKEN ?? '',
-        DEBUG_JOTAI: process.env.DEBUG_JOTAI ?? '',
       };
     },
     get beta() {