Add workflow infrastructure — ESLint, Prettier, Husky, Vitest, 7 new skills

Phase 1: Session log archived (1096→91 lines), D031 token access convention
Phase 2: ESLint v9 + Prettier + jsx-a11y, initial config and lint fixes
Phase 3: 7 new skills (polish, harden, normalize, clarify, typeset, quieter, adapt)
         + Vercel reference docs, updated audit/review-component refs
Phase 4: Husky + lint-staged pre-commit hooks, preflight updated to 8 checks
Phase 5: Vitest + Testing Library + /write-tests skill

- Badge.tsx colour maps unified to CSS variables (D031)
- 5 empty interface→type alias fixes (Switch, Radio, Divider, IconButton, Link)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/reference/vercel/web-interface-guidelines-full.md

@@ -0,0 +1,179 @@
+---
+description: Review UI code for Vercel Web Interface Guidelines compliance
+argument-hint: <file-or-pattern>
+---
+
+# Web Interface Guidelines
+
+Review these files for compliance: $ARGUMENTS
+
+Read files, check against rules below. Output concise but comprehensive—sacrifice grammar for brevity. High signal-to-noise.
+
+## Rules
+
+### Accessibility
+
+- Icon-only buttons need `aria-label`
+- Form controls need `<label>` or `aria-label`
+- Interactive elements need keyboard handlers (`onKeyDown`/`onKeyUp`)
+- `<button>` for actions, `<a>`/`<Link>` for navigation (not `<div onClick>`)
+- Images need `alt` (or `alt=""` if decorative)
+- Decorative icons need `aria-hidden="true"`
+- Async updates (toasts, validation) need `aria-live="polite"`
+- Use semantic HTML (`<button>`, `<a>`, `<label>`, `<table>`) before ARIA
+- Headings hierarchical `<h1>`–`<h6>`; include skip link for main content
+- `scroll-margin-top` on heading anchors
+
+### Focus States
+
+- Interactive elements need visible focus: `focus-visible:ring-*` or equivalent
+- Never `outline-none` / `outline: none` without focus replacement
+- Use `:focus-visible` over `:focus` (avoid focus ring on click)
+- Group focus with `:focus-within` for compound controls
+
+### Forms
+
+- Inputs need `autocomplete` and meaningful `name`
+- Use correct `type` (`email`, `tel`, `url`, `number`) and `inputmode`
+- Never block paste (`onPaste` + `preventDefault`)
+- Labels clickable (`htmlFor` or wrapping control)
+- Disable spellcheck on emails, codes, usernames (`spellCheck={false}`)
+- Checkboxes/radios: label + control share single hit target (no dead zones)
+- Submit button stays enabled until request starts; spinner during request
+- Errors inline next to fields; focus first error on submit
+- Placeholders end with `…` and show example pattern
+- `autocomplete="off"` on non-auth fields to avoid password manager triggers
+- Warn before navigation with unsaved changes (`beforeunload` or router guard)
+
+### Animation
+
+- Honor `prefers-reduced-motion` (provide reduced variant or disable)
+- Animate `transform`/`opacity` only (compositor-friendly)
+- Never `transition: all`—list properties explicitly
+- Set correct `transform-origin`
+- SVG: transforms on `<g>` wrapper with `transform-box: fill-box; transform-origin: center`
+- Animations interruptible—respond to user input mid-animation
+
+### Typography
+
+- `…` not `...`
+- Curly quotes `"` `"` not straight `"`
+- Non-breaking spaces: `10&nbsp;MB`, `⌘&nbsp;K`, brand names
+- Loading states end with `…`: `"Loading…"`, `"Saving…"`
+- `font-variant-numeric: tabular-nums` for number columns/comparisons
+- Use `text-wrap: balance` or `text-pretty` on headings (prevents widows)
+
+### Content Handling
+
+- Text containers handle long content: `truncate`, `line-clamp-*`, or `break-words`
+- Flex children need `min-w-0` to allow text truncation
+- Handle empty states—don't render broken UI for empty strings/arrays
+- User-generated content: anticipate short, average, and very long inputs
+
+### Images
+
+- `<img>` needs explicit `width` and `height` (prevents CLS)
+- Below-fold images: `loading="lazy"`
+- Above-fold critical images: `priority` or `fetchpriority="high"`
+
+### Performance
+
+- Large lists (>50 items): virtualize (`virtua`, `content-visibility: auto`)
+- No layout reads in render (`getBoundingClientRect`, `offsetHeight`, `offsetWidth`, `scrollTop`)
+- Batch DOM reads/writes; avoid interleaving
+- Prefer uncontrolled inputs; controlled inputs must be cheap per keystroke
+- Add `<link rel="preconnect">` for CDN/asset domains
+- Critical fonts: `<link rel="preload" as="font">` with `font-display: swap`
+
+### Navigation & State
+
+- URL reflects state—filters, tabs, pagination, expanded panels in query params
+- Links use `<a>`/`<Link>` (Cmd/Ctrl+click, middle-click support)
+- Deep-link all stateful UI (if uses `useState`, consider URL sync via nuqs or similar)
+- Destructive actions need confirmation modal or undo window—never immediate
+
+### Touch & Interaction
+
+- `touch-action: manipulation` (prevents double-tap zoom delay)
+- `-webkit-tap-highlight-color` set intentionally
+- `overscroll-behavior: contain` in modals/drawers/sheets
+- During drag: disable text selection, `inert` on dragged elements
+- `autoFocus` sparingly—desktop only, single primary input; avoid on mobile
+
+### Safe Areas & Layout
+
+- Full-bleed layouts need `env(safe-area-inset-*)` for notches
+- Avoid unwanted scrollbars: `overflow-x-hidden` on containers, fix content overflow
+- Flex/grid over JS measurement for layout
+
+### Dark Mode & Theming
+
+- `color-scheme: dark` on `<html>` for dark themes (fixes scrollbar, inputs)
+- `<meta name="theme-color">` matches page background
+- Native `<select>`: explicit `background-color` and `color` (Windows dark mode)
+
+### Locale & i18n
+
+- Dates/times: use `Intl.DateTimeFormat` not hardcoded formats
+- Numbers/currency: use `Intl.NumberFormat` not hardcoded formats
+- Detect language via `Accept-Language` / `navigator.languages`, not IP
+
+### Hydration Safety
+
+- Inputs with `value` need `onChange` (or use `defaultValue` for uncontrolled)
+- Date/time rendering: guard against hydration mismatch (server vs client)
+- `suppressHydrationWarning` only where truly needed
+
+### Hover & Interactive States
+
+- Buttons/links need `hover:` state (visual feedback)
+- Interactive states increase contrast: hover/active/focus more prominent than rest
+
+### Content & Copy
+
+- Active voice: "Install the CLI" not "The CLI will be installed"
+- Title Case for headings/buttons (Chicago style)
+- Numerals for counts: "8 deployments" not "eight"
+- Specific button labels: "Save API Key" not "Continue"
+- Error messages include fix/next step, not just problem
+- Second person; avoid first person
+- `&` over "and" where space-constrained
+
+### Anti-patterns (flag these)
+
+- `user-scalable=no` or `maximum-scale=1` disabling zoom
+- `onPaste` with `preventDefault`
+- `transition: all`
+- `outline-none` without focus-visible replacement
+- Inline `onClick` navigation without `<a>`
+- `<div>` or `<span>` with click handlers (should be `<button>`)
+- Images without dimensions
+- Large arrays `.map()` without virtualization
+- Form inputs without labels
+- Icon buttons without `aria-label`
+- Hardcoded date/number formats (use `Intl.*`)
+- `autoFocus` without clear justification
+
+## Output Format
+
+Group by file. Use `file:line` format (VS Code clickable). Terse findings.
+
+```text
+## src/Button.tsx
+
+src/Button.tsx:42 - icon button missing aria-label
+src/Button.tsx:18 - input lacks label
+src/Button.tsx:55 - animation missing prefers-reduced-motion
+src/Button.tsx:67 - transition: all → list properties
+
+## src/Modal.tsx
+
+src/Modal.tsx:12 - missing overscroll-behavior: contain
+src/Modal.tsx:34 - "..." → "…"
+
+## src/Card.tsx
+
+✓ pass
+```
+
+State issue + location. Skip explanation unless fix non-obvious. No preamble.