/forge-shadow — Regenerate Shadows

From the brand color's hue, generate 5 shadow levels:

sm: subtle card edge → 0 1px 2px hsla(hue, 20%, 20%, 0.04) md: standard card → layered for depth lg: dropdown/popup → stronger, wider spread xl: modal/dialog → dramatic elevation 2xl: hero/spotlight → maximum elevation

Shadows use brand-tinted color, not generic gray. This creates visual cohesion.