feat: dark luxury redesign with black heart branding

Complete visual overhaul: dark-only mode, rose/crimson accent system,
glassmorphism header, animated hero with floating hearts and glow orbs,
photo-backed cards, infinite team carousel with drag support,
redesigned modals with hero images, black heart logo with rose glow silhouette.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/ui/SectionHeading.tsx

@@ -9,7 +9,7 @@ export function SectionHeading({ children, className = "" }: SectionHeadingProps
       className={`font-display text-3xl font-bold tracking-tight sm:text-4xl lg:text-5xl ${className}`}
     >
       {children}
-      <span className="mt-2 block h-1 w-16 rounded bg-neutral-900 dark:bg-white" />
+      <span className="mt-3 block h-[2px] w-16 rounded-full bg-gradient-to-r from-rose-500 to-rose-500/0" />
     </h2>
   );
 }