build: regenerate CSS and fix tag cloud color rendering
- Rebuilt CSS with main.min.css using Tailwind
- Fixed tag-cloud.html template: replaced cond function with if/else to properly render CSS color variables
- All tag cloud instances now render with correct inline styles: var(--accent) and var(--text-dim)
- HTML output verified across homepage, article sidebars, and 404 page
- Language-aware tag URLs confirmed: /tags/* for English, /it/tags/* for Italian
