fix(setup): improve light mode styling for language and framework cards

- Update language selection cards with light mode text colors
- Update framework/template cards with light mode backgrounds and borders
- Use text-gray-900 dark:text-white pattern for proper contrast
- Add bg-gray-100 dark:bg-white/5 for unselected card backgrounds

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: leaanthony