Fix snapshot calendar and instance tab colors across themes

Maya Prequested to merge
fix/snapshot-calendar-dark-theme into master

Description

Fix theme compatibility in the snapshot calendar and instance tabs.

  • Replace the calendar’s opaque light-only day fills with translucent neutral and brand fills.
  • Let snapshot-count badges inherit the day fill instead of forcing white.
  • Use Material UI theme tokens for tab text, dividers, and disabled states so tabs render correctly in both light and dark themes.

Related issue

Closes #767 (closed)

Examples

Before

Snapshot calendar before

After

Snapshot calendar after

Validation

  • pnpm --filter @postgres.ai/shared build
  • pnpm --filter @postgres.ai/ce build
  • pnpm --filter @postgres.ai/ce test (12 files, 131 tests)
  • Focused Cypress render on a dark surface
Edited by Maya P

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