fix(chat): a2ui catalog layout polish (component-scoped CSS) #638

Job	Run time
Cockpit — build all examples	5m 18s
Cockpit — build / test	1m 47s
Cockpit — representative capability smoke	1m 28s
Library — lint / test / build	3m 4s
Cockpit — deploy smoke dry-run	1m 34s
Cockpit — e2e	2m 24s
Website — e2e	2m 30s
Website — lint / build	2m 2s
examples/chat — python smoke	1m 39s
Cockpit — secret-gated integration	1m 35s
Deploy → Vercel	-1s
Production smoke	-1s
	23m 19s

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