fix(material-experimental/theming): Update M3 palettes #28109
Merged
+390
−196
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Last time I checked, the M3 theme generator generated the same neutral palette regardless of the primary color used. That didn't really make much sense, because it caused the neutral colors to always have a purplish tint. It seems like maybe a bug that was fixed, because now it generates different neutral colors depending on the primary.
I've updated our pre-defined palettes to capture these different neutrals. I created a script to convert the MDC theme builder exports to our palette CSS format. I'm not including it as part of this commit, but just FYI that it'll be cheap to add to / update our predefined palettes in the future. If we want the script checked in I can clean it up and make a separate PR for it.