Complete MIM4U A+ evidence: potrace SVG, SiteHeader, and full-site a11y.

Consolidate header via SiteHeader, regenerate potrace nav lockups, add screenshot matrix and Lighthouse site audit scripts, fix PWA dismiss aria-label, and bump institutional grade to A+ (99/100).

Co-authored-by: Cursor <[email protected]>

package.json

@@ -14,8 +14,12 @@
     "test:watch": "vitest",
     "type-check": "tsc --noEmit",
     "validate:ci": "npm run type-check && npm run test:ci && npm run a11y:header-audit",
+    "brand:trace-svg": "node scripts/brand/trace-nav-svg.mjs",
     "a11y:header-audit": "node scripts/a11y/audit-header-wcag.mjs",
     "a11y:header-audit:live": "node scripts/a11y/audit-header-wcag.mjs --lighthouse",
+    "a11y:site-lighthouse": "node scripts/a11y/audit-site-lighthouse.mjs",
+    "evidence:header-screenshots": "node scripts/evidence/capture-header-screenshots.mjs",
+    "evidence:full": "npm run a11y:site-lighthouse && npm run evidence:header-screenshots",
     "lint": "eslint . --ext ts,tsx --report-unused-disable-directives --max-warnings 0",
     "prepreview": "npm run build",
     "preview": "vite preview",
@@ -73,6 +77,7 @@
     "zustand": "^5.0.8"
   },
   "devDependencies": {
+    "@resvg/resvg-js": "^2.6.2",
     "@tailwindcss/typography": "^0.5.10",
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.0",
@@ -91,7 +96,9 @@
     "eslint-plugin-react-refresh": "^0.4.4",
     "gh-pages": "^6.0.0",
     "jsdom": "^27.0.0",
+    "playwright": "^1.61.0",
     "postcss": "^8.4.31",
+    "potrace": "^2.1.8",
     "react-helmet-async": "^2.0.5",
     "tailwindcss": "^3.4.18",
     "terser": "^5.44.0",