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fix(ui): give the shared components the behaviour their roles promise #368

Job	Run time
JS build (Vite)	41s
File size (300-line cap)	16s
Python tests	6m 45s
Python typecheck	17s
Package build (release dry-run)	12s
JS typecheck	34s
Perf guards (Playwright)	1m 42s
JS tests (Vitest)	49s
Python lint & format	16s
E2E smoke (Playwright)	2m 11s
JS lint & format	22s
PR checks	3s
	14m 8s