Enhanced popup text contrast and readability:
- Added text-shadow to all values for better contrast against dark background
- Properly handle zero/null values (e.g., Track: 0° now shows instead of N/A)
- Style N/A values with slightly dimmed gray (#aaaaaa) but still clearly visible
- Add 'no-data' class to distinguish missing data from actual zero values
- Ensure all text has strong white color with !important declarations
This fixes visibility issues where some values appeared too faint or were
incorrectly treated as missing when they were actually zero.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
