Matches the iOS revert. Unpicks the nine commits that took Android from the
site-derived palette to purple-into-black dark-only: the purple ground, the
darkening passes, the single dark theme, the three-stop gradient, white text
boxes and white icons.
Two reconciliations, both because the surrounding work was worth keeping:
* `MainActivity`'s root `Surface` goes back to the plain one. The
transparent-Surface trap it documented -- Material deriving
`contentColor` from `contentColorFor(Transparent)`, getting Unspecified,
and falling back to BLACK text -- only existed because the Surface was
transparent to let a gradient through. No gradient, no trap.
* `CallScreen` painted `groundBrush()` to avoid stamping a flat rectangle
over that gradient. Back to `colorScheme.background`, since there is no
longer a gradient to clash with.
`PaletteMatchesIOSTest` goes with the theme it was written to hold in place.
574 tests pass.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
