feat(web): mobile-fit hero tiles + voluminous calmer particle field + FAQ accordion

Three coordinated polish items requested:

1. **Hero step-rotator tiles fit mobile without horizontal scroll.**
   The previous snippets contained a 50+ char `Live at https://notion-x9.mcp.buildmymcpserver.com` URL that overflowed the ~295 px text area on a 375 px viewport. Rewrote all three snippets to be naturally short — same product story, no full URLs. The <pre> drops `overflow-x-auto` and gains `whitespace-pre-wrap break-words` so any token that does exceed the column wraps gracefully instead of forcing a scrollbar.

2. **ParticleHero — more volumetric, slower, steadier at load-in.**
   The "stuttery / too fast" feedback came from two issues compounding: tiny dots (1.8 px on 256-tier, with 0.42 base alpha) gave the eye too few pixels to track between frames, so individual particles read as snapping rather than drifting; and the simplex-noise drift evolved at 0.08 time-scale with 0.045 velocity, fast enough that frame-to-frame deltas exceeded a tracked particle's diameter.

   Render uniforms tuned:
   - `uPointSize` 1.8 → 2.8 (256-tier), 2.4 → 3.6 (128-tier)
   - `uBaseAlpha` 0.42 → 0.60

   Simulation shader tuned:
   - Drift noise time scale 0.08 → 0.045 (the most impactful single change — particles now move at half the previous speed)
   - Drift velocity magnitude 0.045 → 0.028
   - Ring breathing noise time scale 0.35 → 0.22
   - Ring polar-wave time scales 1.2 / 0.7 → 0.7 / 0.42

   Net effect: same number of particles (65k) but each individually larger, brighter, and moving more slowly. The cumulative additive bloom is denser without the jitter that read as visual stutter.

3. **FAQ collapsed into a native `<details>` accordion.**
   Crawlers and screen readers still see every Q+A in the SSR'd HTML — `<details><summary>...</summary><p>answer</p></details>` is the standard semantic pattern for disclosure widgets. Users see one question at a time and expand on demand, which keeps the page from feeling like an endless wall of marketing text below the fold.

   Container narrowed `max-w-6xl` → `max-w-3xl` for accordion typography (long-form prose reads better single-column). The default WebKit disclosure-triangle marker is suppressed with `list-none` + `[&_summary::-webkit-details-marker]:hidden`, and a `lucide-react` `ChevronDown` icon rotates 180° via `group-open:rotate-180` to indicate state.

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

apps/web/components/particle-hero/shaders.ts

@@ -121,11 +121,14 @@ export const simFragment = /* glsl */ `
     float r = length(d);
     float ang = atan(d.y, d.x);
 
-    // Breathing distortion of the radius itself.
-    float noise = snoise(p * 4.0 + uTime * 0.35) * 0.05;
+    // Breathing distortion of the radius itself. Time scale tuned
+    // down (was 0.35 → 0.22) so the ring "breathes" rather than
+    // pulsates, which used to read as visual stutter on slow drift.
+    float noise = snoise(p * 4.0 + uTime * 0.22) * 0.05;
     // Polar wave — a slow rippling around the circumference.
-    float wave  = sin(ang * 5.0 + uTime * 1.2) * 0.012
-                + cos(ang * 3.0 - uTime * 0.7) * 0.010;
+    // Same calming pass on both phases.
+    float wave  = sin(ang * 5.0 + uTime * 0.7) * 0.012
+                + cos(ang * 3.0 - uTime * 0.42) * 0.010;
     float rr = r + noise + wave;
 
     // Three bands of different thickness at slightly offset radii.
@@ -149,10 +152,15 @@ export const simFragment = /* glsl */ `
     // --- Idle drift: rotational simplex-noise current ---
     // Time is scaled by uMotionScale so reduced-motion users get a
     // calmer field that evolves at half speed.
+    // Noise-evolution speed dropped from 0.08 → 0.045 (almost halved)
+    // and velocity magnitude from 0.045 → 0.028. The combination kills
+    // the perceived stutter — each particle now moves slowly enough
+    // that the eye tracks individual motion as smooth drift rather
+    // than as jerky per-frame teleportation.
     float driftTime = uTime * uMotionScale;
-    float n1 = snoise(pos * 1.6 + vec2(driftTime * 0.08, 0.0));
-    float n2 = snoise(pos * 1.6 + vec2(0.0, driftTime * 0.08) + 53.7);
-    vec2 driftVel = vec2(-n2, n1) * 0.045 * uMotionScale; // curl-like rotation
+    float n1 = snoise(pos * 1.6 + vec2(driftTime * 0.045, 0.0));
+    float n2 = snoise(pos * 1.6 + vec2(0.0, driftTime * 0.045) + 53.7);
+    vec2 driftVel = vec2(-n2, n1) * 0.028 * uMotionScale; // curl-like rotation
 
     // --- Ring push: gradient of the ring field, pointing outward ---
     float h = 0.003;