1. TLD Matrix fix:
- Pass original_is_taken flag to run_tld_matrix()
- If main domain check shows taken, force same TLD to show as taken
- Fixes incorrect "available" display for owned domains
2. Portfolio table:
- Use minmax() for flexible column widths
- Smaller gaps and padding for compact layout
- Smaller action buttons (w-8 h-8)
- Shorter column labels (Bought, Exp.)
