design: improve UI consistency and footer layout
- Update text sizing to text-base throughout for consistency
- Improve arrow icon visibility (gray-400 → gray-200 on hover)
- Reorganize tool badges: Open Source first, specialty second, Free third
- Update badge labels: Vert (Converter), Stirling (PDF), Units/Figlet (Open Source)
- Redesign footer: single-row layout with brand pill, centered copyright, GitHub link
- Update footer border: lighter gray-600, constrained to content width
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Co-Authored-By: Claude <noreply@anthropic.com>
Sebastian Krüger
593c76de5c