Redesign navbar + footer, add ⌘K command menu with full-text search

[karngyan]

Revamps the site chrome and README.

Navbar

• Product-style bar: search pill (⌘K), live GitHub star chip (fetched from the GitHub API, localStorage-cached, no layout shift), theme toggle, Get started.
• Collapses on small screens to a search icon + hamburger sheet — mobile finally has real nav (search, full link list, CTA, socials).
• Opens the command menu on ⌘K / Ctrl+K / /.

Footer

• Oversized reins wordmark signature, brand block + Product/Docs/Project columns.
• X / GitHub / npm social icons and "Built by Karn and AI agents."

⌘K command menu (cmdk + Pagefind)

• Curated Pages / Actions / Links, filtered client-side.
• Full-text docs search via Pagefind — indexed at build from data-pagefind-body, lazy-loaded /pagefind/ bundle, real excerpts with match highlighting. Static, works on Cloudflare; dev gracefully falls back to curated items only (no index).
• Build now runs pagefind --site dist/client after vite build.

Hero mock polish

• Dark browser background → true near-black, brighter (less brown) amber "controlling this browser" banner, softer outer border.

README

• Slimmed to a quick-start; the deep material (commands, comparison, security) now links to reins.tech/docs.
• Regenerated hero-light/hero-dark with no background frame (transparent rounded corners).

New deps

• cmdk (command menu), pagefind (dev, build-time index).

Verify

• pnpm --filter @reins/web typecheck ✓ · pnpm lint ✓ · pnpm --filter @reins/web build ✓ (Pagefind indexes 8 docs pages)
• Manually verified light/dark, the ⌘K palette, full-text results, and the mobile sheet in a real browser.

🤖 Generated with Claude Code