Results feature polish: badges, contrast, Avg/Best separation

[coder13]

The Results feature could use some UI polish for readability and quick scanning.

Todo

• Add PR / NR / WR badges
• Fix color contrast (especially in dark mode)
• Make the Avg and Best columns more visually distinct
  • ideas: wider cells, a vertical separator line between solve times and Avg/Best, or stronger header styling

Notes

• Goal: make it easier to scan results at a glance without losing legibility in dark mode.