Add syntax highlighting to chat code blocks

[Filsommer]

Summary

• render fenced Markdown code with Shiki syntax highlighting that follows the active theme
• show language labels and an accessible one-click copy action (support hundreds of languages via Shiki)
• preserve inline-code rendering and avoid nested pre elements

Test plan

• pnpm typecheck
• pnpm lint
• pnpm build

Made with Cursor

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	react-shiki@​0.11.0

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[shadcn]

Let me take a look. Thinking if we want syntax highlighting or keep the template minimal. I'm leaning towards yes we do.