grim7/12/2026, 10:56:19 PM

Correct the grouped activity sections to the owner's Paper design:
- the HEADER carries the surface fill (surface-1); rows sit on the darker base
  (card) with NO dividers between them — just the container's outer border.
- add a 'show less' control once expanded (pairs with 'show more (N)').
- verdict chips are a FIXED-WIDTH column (VerdictSlot reserves the width even
  when a row has no verdict) so they line up row to row instead of staggering.

Checks: typecheck, biome, boundaries, 204 tests.

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