feat: announce block drag to screen readers via aria-live (#6608) #564

Job	Run time
Build (Node 20.x)	50s
Cypress E2E	2m 41s
Security audit	12s
Build (Node 22.x)	46s
Jest tests & coverage	1m 13s
Lint commit messages	45s
Lint & format-check changed JS files	54s
	7m 21s

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