refactor(types): tighten type safety, dedupe HfTransitionMeta, prune … #1

Job	Run time
Detect changes	5s
regression-shards (styles-b, style-4-prod style-5-prod style-6-prod)	17m 15s
regression-shards (styles-a, style-1-prod style-2-prod style-3-prod)	14m 24s
regression-shards (fast, --sequential --exclude-tags slow,render-compat,hdr)	16m 41s
regression-shards (hdr, --sequential hdr-regression hdr-hlg-regression)	19m 11s
regression-shards (styles-c, style-7-prod style-8-prod style-9-prod)	16m 13s
regression-shards (styles-g, overlay-montage-prod)	12m 21s
regression-shards (styles-f, style-17-prod style-18-prod)	12m 31s
regression-shards (styles-e, style-13-prod style-15-prod style-16-prod)	19m 44s
regression-shards (render-compat, --sequential gsap-letters-render-compat css-spinner-render-comp...	9m 42s
regression-shards (styles-d, style-10-prod style-11-prod style-12-prod)	16m 38s
regression	3s
	2h 34m 48s

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