fix(website): AnnouncementToast mobile presentation and a11y #2310

Job	Run time
CI scope	1m 24s
Website — e2e	2m 28s
Website — lint / test / build	2m 38s
examples/ag-ui — e2e	3m 32s
Cockpit — build / test	0s
Cockpit — build all examples	0s
examples/chat — e2e (${{ matrix.shard }}/4)	0s
Canonical demo → Vercel	-1s
examples/chat — python smoke	-1s
Cockpit — representative capability smoke	-1s
Cockpit — e2e dispatcher	-1s
Library — lint / test / build	-1s
PostHog — dashboards-as-code drift check	-1s
Cockpit — deploy smoke dry-run	-1s
Cockpit — e2e (${{ matrix.cap.angular }})	-1s
Cockpit — e2e	-1s
examples/chat — e2e	-1s
CI — required	4s
Production smoke	0s
Deploy → Vercel	0s
ag-ui demo → Vercel	-1s
	9m 55s

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