feat(web): restore tall hero + carousel slide + viewport-fixed scroll cue

Three coordinated tweaks to the landing-page above-the-fold:

1. **Hero padding restored to py-14/sm:py-20/md:py-28** (was py-12/14/16).
   Compressing it for the scroll-cue position fight made the hero feel
   cramped and gave the ParticleHero background less room to breathe.
   With the cue moved out (see #3), there's no reason to shrink the hero.

2. **Step rotator switches to carousel-style horizontal slide.** The
   AnimatePresence transition was a fade+y-shift cross-fade — clean but
   sequential. Now the leaving card slides left out (x:-220) while the
   entering card slides right in (x:220→0), both coexisting in the same
   3D-space and inheriting the same mouse-tilt. The container gets
   `min-h-[240px]` so the absolutely-positioned cards have layout to
   anchor to (claude_desktop_config.json is the tallest at 7 lines).
   Reduced-motion still gets the opacity-only cross-fade — sliding
   content sideways is exactly the kind of motion that preference is
   meant to suppress.

3. **`<ScrollCue>` extracted into its own client component**, fixed-
   positioned at viewport bottom (bottom-5) with a frosted pill style.
   Fades to opacity:0 once `window.scrollY > 80`, so it doesn't shadow
   the rest of the page. Lives next to `<section>` in page.tsx rather
   than inside the hero — that way it anchors to the loadscreen's
   natural bottom edge whether the hero is short or tall.

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

apps/web/components/scroll-cue.tsx

@@ -0,0 +1,43 @@
+'use client';
+
+import { ChevronDown } from 'lucide-react';
+import { useEffect, useState } from 'react';
+
+/**
+ * Scroll cue — a fixed pill anchored to the bottom of the viewport that
+ * points the visitor down to the flow video below the hero. Fades out
+ * once the user has scrolled past the loadscreen so it doesn't follow
+ * them around the page.
+ *
+ * Lives at z-30 so it sits above the hero content but below modals.
+ * The frosted pill (backdrop-blur + border) reads clearly against the
+ * particle background without stealing focus from the H1.
+ */
+export function ScrollCue({ targetId }: { targetId: string }) {
+  const [visible, setVisible] = useState(true);
+
+  useEffect(() => {
+    function onScroll() {
+      setVisible(window.scrollY < 80);
+    }
+    onScroll();
+    window.addEventListener('scroll', onScroll, { passive: true });
+    return () => window.removeEventListener('scroll', onScroll);
+  }, []);
+
+  return (
+    <a
+      href={`#${targetId}`}
+      aria-label="See the flow in action"
+      className={`fixed inset-x-0 bottom-5 z-30 mx-auto flex w-fit items-center gap-1.5 rounded-full border border-[--color-border] px-3 py-1.5 text-[10.5px] uppercase tracking-[0.18em] text-[--color-fg-subtle] backdrop-blur transition-opacity duration-500 hover:text-[--color-fg] ${
+        visible ? 'opacity-100' : 'pointer-events-none opacity-0'
+      }`}
+      style={{
+        backgroundColor: 'color-mix(in oklab, var(--color-bg-elevated) 75%, transparent)',
+      }}
+    >
+      <span>see it run</span>
+      <ChevronDown size={12} className="animate-bounce" />
+    </a>
+  );
+}