Add Tailwind CSS v4.1.18 stylesheet to enable utility‑first styling across the project.
- New Features:
- Introduce Tailwind CSS utility classes for consistent UI theming.
- Provide a comprehensive design system via generated Tailwind utilities.
- Enhancements:
- Replace custom CSS with Tailwind‑generated utilities for faster development.
- Enable responsive and customizable styling without manual overrides.
- Bug Fixes:
