Gallery pattern family

Added gallery/base and gallery/masonry patterns with hover overlays and CSS-columns layout.

Enhanced dark mode

All patterns now have refined dark mode colors with better contrast ratios and OKLCH values.

CLI tool launched

Install patterns directly via npx @webspire/cli add hero/base. Supports init, add, and list commands.

Safari backdrop-filter fix

Fixed glass effects not rendering correctly in Safari 17.2 by adding webkit prefix fallbacks.