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

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.