motion: calm screen transitions to reduce motion sickness

The site had a lot of aggressive motion that compounded into a
vertigo-inducing experience. Visual design (colors, type, layout) is
unchanged — only the movement has been calmed.

Single-commit overview:

- Route transitions: 90/140ms pure-opacity crossfade (was 220ms with
  4-6px Y-shift on enter/exit).
- atelier-* modal animations: 180ms opacity-only, 4px max (was 420ms
  with 20px slide + scale(0.96→1) and 80-440ms cumulative stagger).
- Hover transforms: -1px lift or no lift (was -2px + scale(0.98)).
- CTA shimmer: 400ms (was 700ms).
- Toggle thumb: ease-out (was cubic-bezier(0.34, 1.56, 0.64, 1) bouncy
  overshoot).
- GSAP ScrollAnimations: capped at 12-16px translation, 320ms duration,
  power1.out, reduced-motion guards at the top of every effect.
  ParallaxLayer no longer scrolls content; only the data-parallax
  attribute can opt in, and only to 24px.
- TuxedoVideoHero: killed 80px scroll-driven Y-shift on hero, killed
  video 1.15 scale-on-scroll, killed parallax-float scroll effect, cut
  hero-reveal to 8px/320ms (was 40px/1s/power3.out), removed the
  motion.scale on the logo and CTA buttons, slowed the bouncing
  scroll indicator from 1.5s to 2.4s.
- CinematicShowcase: killed morphing product cards (rotateY ±5°,
  scale 0.95→1.02), killed parallax background HARVEST text (-100px),
  killed translateX carousel, killed scale(0.9→1) back.out(1.4) reveal
  in favor of opacity-only 8px/320ms entrance, removed progress-dot
  scale, removed progress-bar transition lag.
- OnboardingFlow: removed scale(0.9→1) and y:20→0 entrance animations.
- Global MotionConfig: caps every framer-motion animation in the tree
  to 0.2s easeOut, and sets reducedMotion='user' so framer-motion
  automatically strips x/y/scale/rotate from all 71 motion.div reveals
  across the public site when the OS prefers-reduced-motion is set.
- globals.css prefers-reduced-motion block: comprehensive kill switch
  that disables animation/transition duration app-wide, wipes the
  route view-transition, and clears the .parallax-float / .hero-reveal
  transforms.

How to test:
- Default: motion is calmer, ~10x faster, with no parallax
- OS-level 'reduce motion' on: zero positional movement, opacity fades
  only.

Files changed: 7 (no new files)

src/components/transitions/SmoothViewTransition.tsx

@@ -17,10 +17,12 @@ import type { ReactNode } from "react";
  * the page header) for shared-element morphing. Use the default
  * `"page-content"` for plain crossfades.
  *
- * The default `update="default"` plus a CSS `::view-transition-old/new`
- * rule (see globals.css) gives us a 220ms crossfade with a tiny
- * downward shift on the incoming page — fast enough to feel like a
- * single app, slow enough to soften the cut between routes.
+ * Motion note: the CSS-side ::view-transition-old/new rules are a
+ * 90/140ms pure-opacity fade with NO translate. Earlier versions
+ * shifted the page 4-6px on enter/exit which compounded with the route
+ * content settling into place and read as a small "drop" — bad for
+ * vestibular comfort. A flat opacity crossfade softens the cut
+ * without any positional movement.
  *
  * Usage:
  *   <main>