feat(timeline): full state history and quieter chart cyan (#111) #69

Job	Run time
Route registry and test discovery	47s
webkit critical smoke	2m 12s
Chromium responsive, a11y, keyboard, and performance	7m 37s
Deliberate visual snapshot gate (Windows baseline)	8m 19s
firefox critical smoke	2m 8s
Optional authenticated production smoke	-1s
	21m 2s

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