Root cause: transition with transform on .card promoted it to a GPU
compositing layer. Chrome miscalculates paint bounds for tall containers
with many children, causing content to clip until a zoom triggers repaint.

Fixes:
- Remove transform from .card transition (only box-shadow/border-color)
- Use transform:none instead of translateY(0)/translateX(0) in animation
  end states to release the compositing layer after animation completes
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>