feat(styles): enable smooth in-page anchor scrolling

Adds html { scroll-behavior: smooth } with a prefers-reduced-motion
override. Required for the relaunch hero's 'See it in action' anchor
CTA to feel natural.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/styles/global.css

@@ -18,6 +18,13 @@
     -webkit-font-smoothing: antialiased;
     -moz-osx-font-smoothing: grayscale;
     text-rendering: optimizeLegibility;
+    scroll-behavior: smooth;
+  }
+
+  @media (prefers-reduced-motion: reduce) {
+    html {
+      scroll-behavior: auto;
+    }
   }
   body {
     @apply min-h-screen;