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.

Start by locating the Results feature's UI entry point and existing styling, then review the results table in both light and dark modes. Done means PR, NR, and WR badges are present, contrast is readable in dark mode, and the Avg and Best columns are visually distinct without reducing legibility.

Written by the indexing model from the issue text.