The search input's onKeyDown handler used window.location.href which is
unavailable during SSR, causing the /docs page to crash. Replaced with
a Link wrapper so it's fully server-rendered.
- Docs index: hero section with search bar, card grid with metadata/tags, recent strip
- Doc page: section badges, card-style related docs, improved revision history
- Sidebar: section icons, active state highlighting, better typography
- Install rehype-slug (proper heading anchors) + github-slugger (matching TOC)
- TOC component: auto-generated from h2/h3 headings, clickable anchors
- Dark mode toggle: ThemeToggle (localStorage + system default), class-based
- /docs index page (lists all docs by section)
- Markdown.tsx uses rehype-slug for stable heading ids
- globals.css: @custom-variant dark (.dark class) for class-based dark mode
- layout.tsx: nav includes ThemeToggle
Note: per user instruction, installed real deps (rehype-slug, github-slugger,
@types/hast) instead of hacky inline any-cast hacks.