polish: consolidate typography to next/font variables, add atelier utility classes

- Remove Google Fonts @import from 4 components (SiteHeader, LandingPageWrapper,
  TestimonialsAndCTA, FeaturesAndStats) — eliminate render-blocking external
  request and font flash
- Replace all unloaded Cormorant Garamond / Playfair Display / DM Sans /
  Plus Jakarta Sans references with the existing next/font variables
  (Fraunces, Manrope, Fragment_Mono) — visual coherence with the design system
- Update 9 pages (blog, brands, changelog, maintenance, protected-example,
  roadmap, security, waitlist, WaitlistForm) to use the loaded Fraunces
- Fix dead --font-geist / --font-jetbrains-mono references in
  admin-design-system.css (now point to --font-manrope / --font-fragment-mono
  which are actually loaded)
- Add atelier-pill, atelier-numerals, atelier-fineprint, atelier-canvas-soft
  utility classes; .atelier-input:focus-visible refined ring
- Add .ha-field-textarea, .ha-scroll, .ha-skeleton to admin design system
- Extend prefers-reduced-motion guard to atelier-enter/stagger/shimmer
- Apply atelier-fineprint to login/not-found/error pages for consistency
- No structural changes; build passes, 0 type errors

src/app/blog/page.tsx

@@ -130,7 +130,7 @@ export default function BlogPage() {
       {/* Hero */}
       <section className="py-12 sm:py-16 md:py-20">
         <div className="max-w-4xl mx-auto px-4 sm:px-6 text-center">
-          <h1 className="text-4xl sm:text-5xl md:text-6xl font-bold text-[#1a1a1a] mb-4" style={{ fontFamily: "'Cormorant Garamond', Georgia, serif" }}>
+          <h1 className="text-4xl sm:text-5xl md:text-6xl font-bold text-[#1a1a1a] mb-4" style={{ fontFamily: "var(--font-fraunces)" }}>
             Blog & Resources
           </h1>
           <p className="text-lg sm:text-xl text-[#6b8f71]">
@@ -151,7 +151,7 @@ export default function BlogPage() {
                 <span className="inline-block w-fit px-3 py-1 bg-[#c97a3e]/10 text-[#c97a3e] text-sm font-medium rounded-full mb-4">
                   Featured
                 </span>
-                <h2 className="text-3xl font-bold text-[#1a1a1a] mb-4" style={{ fontFamily: "'Cormorant Garamond', Georgia, serif" }}>
+                <h2 className="text-3xl font-bold text-[#1a1a1a] mb-4" style={{ fontFamily: "var(--font-fraunces)" }}>
                   Getting Started with Route Commerce
                 </h2>
                 <p className="text-[#666] mb-6">
@@ -234,7 +234,7 @@ export default function BlogPage() {
       {/* Newsletter */}
       <section className="py-20 bg-gradient-to-br from-[#1a4d2e] to-[#2d6a4f]">
         <div className="max-w-2xl mx-auto px-6 text-center">
-          <h2 className="text-3xl font-bold text-white mb-4" style={{ fontFamily: "'Cormorant Garamond', Georgia, serif" }}>
+          <h2 className="text-3xl font-bold text-white mb-4" style={{ fontFamily: "var(--font-fraunces)" }}>
             Stay in the Loop
           </h2>
           <p className="text-[#faf8f5]/80 mb-8">