Refine HomePage layout and add Locations dropdown to Navigation

- Navigation: add NavItem.children support for desktop dropdown + mobile collapsible sections. Wire Locations (Melbourne, Brisbane, Sydney, South Coast NSW, Central Coast NSW) before FAQ in all HomePage stories.
- HomePage hero: add italic "Trusted by thousands of families across Australia" tagline above h1, widen text container to 990px, use hero-couple.jpg background.
- HomePage features: rename "How it works" to "4 Reasons to use Funeral Arranger", add "Why Use Funeral Arranger" overline, remove placeholder body copy.
- HomePage testimonials: add "Funeral Arranger Reviews" overline above "What families are saying".
- HomePage CTA: promote "Start planning" to primary contained button (medium).
- FuneralFinderV3: remove header + divider so the form starts directly at "How can we help".

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

src/components/pages/HomePage/HomePage.stories.tsx

@@ -40,6 +40,16 @@ const nav = (
   <Navigation
     logo={<FALogo />}
     items={[
+      {
+        label: 'Locations',
+        children: [
+          { label: 'Melbourne', href: '/locations/melbourne' },
+          { label: 'Brisbane', href: '/locations/brisbane' },
+          { label: 'Sydney', href: '/locations/sydney' },
+          { label: 'South Coast NSW', href: '/locations/south-coast-nsw' },
+          { label: 'Central Coast NSW', href: '/locations/central-coast-nsw' },
+        ],
+      },
       { label: 'FAQ', href: '/faq' },
       { label: 'Contact Us', href: '/contact' },
       { label: 'Log in', href: '/login' },