chore: replace slate accent color with purple #1740

Job	Run time
build-lumina-nvidia (40, silverblue, open)	12m 50s
build-lumina (40, silverblue)	11m 12s
build-lumina-nvidia (40, cosmic, open)	12m 14s
build-lumina (40, cosmic)	9m 41s
build-lumina-nvidia (41, silverblue, open)	11m 3s
build-lumina (41, silverblue)	12m 52s
build-lumina-nvidia (41, cosmic, open)	11m 22s
build-lumina (41, cosmic)	9m 53s
build-lumina-nvidia (stable, silverblue, open)	12m 28s
build-lumina (stable, silverblue)	10m 37s
build-lumina-nvidia (stable, cosmic, open)	11m 25s
build-lumina (stable, cosmic)	12m 28s
check	3s
	2h 18m 8s

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