refactor(website): migrate to shadcn/ui component primitives #42

Job	Run time
Cockpit — deploy smoke dry-run	12s
Cockpit — secret-gated integration	11s
Chat Agent — smoke	15s
MCP — build / smoke	9s
Website — lint / build	16s
Cockpit — representative capability smoke	15s
Website — e2e	12s
Cockpit — e2e	14s
Library — lint / test / build	10s
Cockpit — build / test	11s
Deploy → Vercel	0s
	2m 5s

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