feat(landing): publish QuantLab landing via GitHub Pages (#249)

Author: Whiteks1

.github/workflows/pages.yml

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+name: Deploy Landing To GitHub Pages
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - "landing/**"
+      - ".github/workflows/pages.yml"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+jobs:
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v5
+
+      - name: Upload landing artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./landing
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

landing/README.md

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+# QuantLab Landing
+
+Landing estatica preparada para publicarse en GitHub Pages.
+
+## Estructura
+
+- `index.html`
+- `styles.css`
+- `app.js`
+
+## Preview local
+
+Se puede abrir `index.html` directamente o servir la carpeta `landing/` con cualquier servidor estatico.
+
+## Deploy
+
+El workflow [pages.yml](../.github/workflows/pages.yml) publica el contenido de `landing/` en GitHub Pages cuando hay cambios en `main`.
+
+Requisito del repositorio:
+
+- GitHub Pages debe estar configurado para desplegar desde **GitHub Actions**.

landing/app.js

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+document.querySelectorAll(".site-nav a, .button, .header-cta").forEach((link) => {
+  link.addEventListener("click", () => {
+    document.body.dataset.lastAction = link.getAttribute("href") || "";
+  });
+});
+
+const observer = new IntersectionObserver(
+  (entries) => {
+    entries.forEach((entry) => {
+      if (entry.isIntersecting) {
+        entry.target.classList.add("is-visible");
+        observer.unobserve(entry.target);
+      }
+    });
+  },
+  {
+    threshold: 0.18,
+  },
+);
+
+document.querySelectorAll(".panel, .timeline-step, .principle, .maturity-step").forEach((node) => {
+  node.classList.add("reveal");
+  observer.observe(node);
+});