fix: full Apple HIG mobile + SEO audit - all issues resolved

MOBILE RESPONSIVENESS (Apple HIG):
- HeroSection: typography scaled 7xl→4xl sm:5xl md:6xl lg:7xl, responsive px/py, rounded-2xl, active:scale-95
- Cart quantity buttons: h-8→h-11 w-8→w-11 (44px touch target), rounded-xl, active:scale-95
- StorefrontFooter newsletter: responsive w-full sm:w-52 lg:w-64, aria-label, larger touch targets
- StorefrontHeader mobile nav: padding px-6→px-4 py-6→py-5
- AdminTable: overflow-x-auto + min-w-[600px] for horizontal scroll
- AdminOrdersPanel: same table overflow fix
- AdminLayout: mobile px-4 sm:px-6 py-6 sm:py-10
- AdminFilterTabs: responsive text/text sizes
- AdminSidebar hamburger: h-10→h-11 w-10→w-11 (44px touch target)
- DashboardClient: grid gap-3 sm:gap-4, responsive stat text
- OrderEditForm: grid-cols-1 sm:grid-cols-2 (was 2, breaks on mobile)
- BillingClient: min-h-[44px] on select/button
- ProductsClient: h-32 sm:h-40 responsive image height
- StopCard: line-clamp-2 instead of line-clamp-1 on location
- CommunicationsPage: tabs wrapped in overflow-x-auto
- Checkout page: grid breakpoint md not lg
- Tuxedo page: SectionHeader mobile-first, feature grid grid-cols-1 sm:2, label visible
- Tuxedo stats: text-3xl sm:text-4xl

SEO METADATA:
- Root layout: viewport export, full OG/Twitter, metadataBase, keywords, robots
- Tuxedo layout: complete OG + Twitter + canonical + keywords
- Indian River layout: complete OG + Twitter + canonical + keywords
- Tuxedo/IRD FAQ pages: new layout.tsx with full metadata + FAQPage JSON-LD schema
- Tuxedo/IRD Contact pages: new layout.tsx with full metadata
- Pricing page: expanded metadata with OG/Twitter
- Contact page: refactored to layout+ClientPage structure
- Sitemap: updated with dynamic stop URLs, async function

SCHEMA + STRUCTURED DATA:
- FAQPage JSON-LD on FAQ pages
- BreadcrumbList JSON-LD on storefront layouts
- BreadcrumbNav component created (Apple HIG compliant)

BUG FIXES:
- Indian River: replaced raw <img> with Next.js Image component
- Indian River: verified single H1 (others are h2)
- Stop card: location line-clamp-2 for better readability

TYPE CHECK: all pass

src/app/admin/settings/billing/BillingClient.tsx

@@ -41,7 +41,7 @@ export default function BillingClient({ currentTier, brandId }: Props) {
       <select
         value={selectedTier}
         onChange={(e) => setSelectedTier(e.target.value)}
-        className="rounded-xl border border-zinc-600 bg-zinc-900 px-3 py-2 text-sm outline-none focus:border-blue-500"
+        className="rounded-xl border border-zinc-600 bg-zinc-900 px-3 sm:px-4 py-3 sm:py-2 text-sm outline-none focus:border-blue-500 min-h-[44px]"
       >
         {TIERS.map((t) => (
           <option key={t.value} value={t.value}>{t.label}</option>
@@ -50,7 +50,7 @@ export default function BillingClient({ currentTier, brandId }: Props) {
       <button
         onClick={handleSaveTier}
         disabled={saving || selectedTier === currentTier}
-        className="rounded-xl bg-slate-900 px-4 py-2 text-sm font-medium text-white hover:bg-slate-800 disabled:opacity-50"
+        className="rounded-xl bg-slate-900 px-4 sm:px-5 py-3 sm:py-2 text-sm font-medium text-white hover:bg-slate-800 disabled:opacity-50 active:scale-95 transition-all min-h-[44px]"
       >
         {saving ? "Saving..." : saved ? "Saved!" : "Save Tier"}
       </button>