Add brand kit, #/brand page, and responsive logo marks

Export script generates PNG/WebP/favicons/ZIP and OG image; nav uses symbol on mobile and horizontal lockup on desktop; press kit at #/brand with download links and print-friendly guidelines.

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

package.json

@@ -6,6 +6,8 @@
   "description": "Public website for Miracles In Motion 501(c)3 non-profit organization",
   "scripts": {
     "dev": "vite",
+    "brand:export": "bash scripts/brand/export-brand-assets.sh",
+    "prebuild": "npm run brand:export",
     "build": "tsc && vite build",
     "lint": "eslint . --ext ts,tsx --report-unused-disable-directives --max-warnings 0",
     "preview": "vite preview",