feat: particle cloud (no discrete dots) + geo-IP country preselect on login

Two coordinated polish moves the owner asked for.

## 1. Hero particle field — "no white dots, just a glow that follows the mouse and is always in motion"

Previous tuning (uPointSize 2.8, uBaseAlpha 0.6) gave discrete indigo
dots that additively saturated to near-white in dense clusters. The
owner wanted no granular dots visible at all — a continuous indigo
cloud that the cursor pulls toward itself.

Changes:

- **Render fragment**: replaced the anti-aliased disc SDF
  (`smoothstep(0.5, 0.42, d)` — hard edge) with a Gaussian falloff
  (`exp(-d * d * 6.0)` — smooth blob, no edge). Each particle is now
  a soft volume that blends seamlessly with neighbours.

- **Sim fragment**: replaced the outward-gradient ring push with a
  mouse-halo attraction. Particles drift toward an ideal radius
  (~0.20) around the cursor, with exp-bell falloff so they don't
  collapse onto the cursor or feel influenced from across the canvas.
  `ringField()` helper is now unused but kept for future use.

- **JS uniforms**: `uPointSize` 2.8→14 (256-tier) / 3.6→20 (128-tier);
  `uBaseAlpha` 0.6→0.055. Individual particles are below the
  perception threshold for "dot" but 65k of them additively composite
  into a continuous cloud. With the much lower per-particle alpha,
  the cumulative brightness never saturates to white.

- **ParticleField tick loop**: asymmetric ring-active fade — `alpha
  = 0.14` ramping in (fast cursor response), `0.012` decaying out
  (slow glow trail after the pointer moves away). Matches the brief
  "glow longer + attractive to mouse but always in motion".

- **ParticleHero index.tsx**: added an always-on indigo radial
  gradient behind the WebGL canvas, so the hero never reads as
  visually empty between frames — the canvas additively paints the
  dynamic cloud on top. Removed the white-dot stipple from the
  static fallback (it was the most likely source of the "weisse
  punkte" complaint for any visitor on the fallback path).

## 2. SMS login — pre-select country picker from visitor's geo-IP

The country picker on `/login` previously defaulted to `'CH'` for
everyone. Visitors from DE / AT / US / etc. had to manually scroll
to their dial code — small friction but it sits on the highest-stakes
conversion step in the funnel.

- **New API route** `apps/api/src/routes/geo.ts` →
  `GET /v1/geo/country` returns `{ country: 'CH' | 'DE' | … | null }`
  by reading Cloudflare's `CF-IPCountry` header. Public, no auth —
  reading a 2-letter country code from a geo-IP header isn't PII
  under GDPR / DSG. `'XX'` and `'T1'` (CF's "unknown" + Tor) are
  normalised to `null`. Outside CF (dev), header is missing → null.

- **Login page** picks up the result in the existing `useEffect`,
  guards against codes not in our country list, and calls `setCountry`
  to override the `'CH'` default. Stays at `'CH'` if the detection
  fails or the visitor is on a Tor exit. Verified live: the endpoint
  returns `{"country":"DE"}` from CF's German edge.

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

apps/web/components/hero-step-rotator.tsx

@@ -23,6 +23,10 @@ interface Step {
 // scrolling inside the tile. `whitespace-pre-wrap` on the <pre> below
 // lets any remaining over-width tokens (e.g. someone shrinks the
 // viewport to 320 px) wrap instead of overflowing.
+// The prompt deliberately mentions the secret NAME (`NOTION_API_KEY`)
+// but never its value — the value goes into the encrypted vault in a
+// separate, backend-only flow (step 02 below). This wording mirrors
+// what the actual product UI accepts.
 const STEPS: Step[] = [
   {
     label: 'prompt.txt',
@@ -31,11 +35,20 @@ const STEPS: Step[] = [
 searches our Notion workspace.
 
 Tools: search_pages, get_page
-Auth: NOTION_API_KEY`,
+Needs: NOTION_API_KEY`,
+  },
+  {
+    label: 'secrets.vault',
+    badge: '02 · Secure',
+    code: `NOTION_API_KEY  = secret_••••••3a8f
+NOTION_DB_ID    = db_••••••f12c
+
+🔒 AES-256, encrypted at rest
+   never sent to the AI`,
   },
   {
     label: 'build.log',
-    badge: '02 · Generate',
+    badge: '03 · Generate',
     code: `✓ Generating spec   (2 tools)
 ✓ Static checks     passed
 ✓ Building image    17.2s
@@ -44,7 +57,7 @@ Auth: NOTION_API_KEY`,
   },
   {
     label: 'claude.config.json',
-    badge: '03 · Connect',
+    badge: '04 · Connect',
     code: `{
   "mcpServers": {
     "notion": {

apps/web/components/particle-hero/ParticleField.tsx

@@ -169,16 +169,18 @@ export function ParticleField({ textureSize, motionScale = 1 }: ParticleFieldPro
 
     const renderUniforms = {
       uPositions: { value: rtB.texture },
-      // Bigger dots + higher base alpha = more volumetric "calm field"
-      // read at the load-in (was 1.8 / 0.42 — read as too thin, looked
-      // stuttery because individual particles were hard to track between
-      // frames). With these values the field has a denser cumulative
-      // glow without any change to the simulation itself.
-      uPointSize: { value: textureSize === 256 ? 2.8 : 3.6 },
+      // Huge soft blobs at very low per-particle alpha → no individual
+      // dots are visible, but 65k of them additively composite into a
+      // continuous indigo cloud. This matches the brief "no white dots,
+      // just a glow." When dots were 2.8px at 0.6 alpha, dense areas
+      // saturated additive-blended into white; with 14px at 0.05 the
+      // saturation point is far above what 65k particles ever sum to,
+      // so the cloud stays indigo even at its brightest.
+      uPointSize: { value: textureSize === 256 ? 14.0 : 20.0 },
       uDpr: { value: dpr },
       uColorCalm: { value: colorCalm },
       uColorHot: { value: colorHot },
-      uBaseAlpha: { value: 0.6 },
+      uBaseAlpha: { value: 0.055 },
     };
     const particleMat = new THREE.ShaderMaterial({
       vertexShader: renderVertex,
@@ -250,10 +252,15 @@ export function ParticleField({ textureSize, motionScale = 1 }: ParticleFieldPro
         smoothed.x = smoothed.x * 0.85 + target.x * 0.15;
         smoothed.y = smoothed.y * 0.85 + target.y * 0.15;
 
-        // Fade ring in/out when the pointer enters/leaves.
+        // Asymmetric fade: ramp in quickly when the pointer enters, decay
+        // slowly when it leaves. The brief said "glow longer + attractive
+        // to mouse but always in motion" — fast ramp-in keeps the cursor
+        // feeling responsive, slow decay lets the glow linger after the
+        // pointer moves away rather than snapping off.
         const targetActive = hasPointer ? 1 : 0;
-        simUniforms.uRingActive.value =
-          simUniforms.uRingActive.value * 0.92 + targetActive * 0.08;
+        const cur = simUniforms.uRingActive.value;
+        const alpha = targetActive > cur ? 0.14 : 0.012;
+        simUniforms.uRingActive.value = cur * (1 - alpha) + targetActive * alpha;
 
         simUniforms.uTime.value = t;
         simUniforms.uDelta.value = delta;

apps/web/components/particle-hero/index.tsx

@@ -136,28 +136,41 @@ export function ParticleHero() {
     return () => reduce.removeEventListener('change', onReduceChange);
   }, []);
 
-  // Static fallback: radial indigo glow + faint dotted mask.
-  // Used both for 'unknown' (pre-hydration) and 'fallback'.
+  // Static fallback: pure indigo radial glow, no dot grid. The
+  // dot-mask was confusing — it read as "stippled white texture"
+  // against the indigo glow rather than as resting particles. The
+  // cleaner, dotless gradient holds up better as a fallback.
   if (cap.kind !== 'webgl') {
     return (
       <div
         aria-hidden="true"
         className="absolute inset-0 size-full overflow-hidden"
         style={{
-          backgroundImage: [
-            // Soft indigo glow centered on the hero
-            'radial-gradient(60% 80% at 50% 45%, rgba(99,102,241,0.18), rgba(99,102,241,0) 70%)',
-            // Very faint dotted texture — reads as "field of particles
-            // at rest" rather than a flat gradient.
-            'radial-gradient(circle at 1px 1px, rgba(255,255,255,0.05) 1px, transparent 1.5px)',
-          ].join(', '),
-          backgroundSize: '100% 100%, 24px 24px',
+          background:
+            'radial-gradient(65% 80% at 50% 45%, rgba(99,102,241,0.22), rgba(99,102,241,0) 72%)',
         }}
       />
     );
   }
 
-  return <ParticleField textureSize={cap.textureSize} motionScale={cap.motionScale} />;
+  // WebGL path: an always-on indigo radial behind the canvas so the
+  // hero never feels visually empty (even between frames, even when the
+  // pointer is far away). The canvas paints the dynamic cloud + halo
+  // additively on top of this baseline glow — the result is "longer
+  // glow" without needing the simulation to keep a permanent ring on.
+  return (
+    <>
+      <div
+        aria-hidden="true"
+        className="pointer-events-none absolute inset-0 size-full"
+        style={{
+          background:
+            'radial-gradient(70% 85% at 50% 48%, rgba(99,102,241,0.22), rgba(99,102,241,0) 72%)',
+        }}
+      />
+      <ParticleField textureSize={cap.textureSize} motionScale={cap.motionScale} />
+    </>
+  );
 }
 
 export default ParticleHero;

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

@@ -162,18 +162,18 @@ export const simFragment = /* glsl */ `
     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;
-    float fx0 = ringField(pos - vec2(h, 0.0));
-    float fx1 = ringField(pos + vec2(h, 0.0));
-    float fy0 = ringField(pos - vec2(0.0, h));
-    float fy1 = ringField(pos + vec2(0.0, h));
-    vec2 grad = vec2(fx1 - fx0, fy1 - fy0) / (2.0 * h);
-    float fieldHere = ringField(pos);
-    // Push along gradient — particles get nudged away from the ring crest.
-    // Magnitude is scaled by uMotionScale so reduced-motion users get a
-    // softer shove while the ring position still tracks at full fidelity.
-    vec2 ringVel = grad * fieldHere * 0.55 * uMotionScale;
+    // --- Mouse halo pull (attraction, not repulsion) ---
+    // Particles are drawn toward a soft halo orbiting the cursor —
+    // strongest at ~0.20 distance, fading both closer and farther.
+    // Closer-fade prevents the cloud from collapsing onto the cursor;
+    // farther-fade keeps the influence local. The result is a moving
+    // bright spot that follows the pointer with a continuous breathing
+    // ring of indigo around it, rather than the old outward push that
+    // hollowed the cloud where the cursor sat.
+    vec2 toMouse = uRingPos - pos;
+    float distToMouse = length(toMouse) + 0.001;
+    float halo = exp(-pow(distToMouse - 0.20, 2.0) * 22.0);
+    vec2 ringVel = (toMouse / distToMouse) * halo * 0.05 * uRingActive * uMotionScale;
 
     // --- Soft containment toward origin if particle escaped ---
     float r = length(pos);
@@ -247,14 +247,19 @@ export const renderFragment = /* glsl */ `
   varying float vScale;
 
   void main() {
-    // Disc SDF — anti-aliased round dot.
+    // Soft Gaussian blob — no hard disc edge. Combined with the bigger
+    // uPointSize on the JS side (14-20px vs the old 2.8) and the much
+    // lower uBaseAlpha (0.05 vs 0.6), individual particles disappear
+    // into a continuous indigo cloud. The exp() falloff means each blob
+    // contributes most at its centre and fades smoothly to nothing —
+    // adjacent blobs blend without seams, so 65k of them additively
+    // composite into a volumetric glow instead of a stipple texture.
     float d = length(gl_PointCoord - 0.5);
-    float a = smoothstep(0.5, 0.42, d);
+    float a = exp(-d * d * 6.0);
     if (a <= 0.001) discard;
 
-    // Velocity-driven mix: pin to indigo for typical drift, lerp toward
-    // green only on real shoves. The 0.04..0.18 band is roughly where
-    // ring pushes live; idle drift stays below 0.03.
+    // Velocity-driven mix kept, but with the new low base alpha the
+    // green tint is barely visible — by design. The cloud is calm.
     float t = smoothstep(0.04, 0.18, vVel);
     vec3 col = mix(uColorCalm, uColorHot, t);