feat: Add GitHub Actions workflow for PR preview deployments

.github/workflows/deploy.yml

@@ -0,0 +1,29 @@
+name: PR Preview Static Files
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+    branches:
+      - main
+
+jobs:
+  deploy-preview:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout PR branch
+        uses: actions/checkout@v4
+
+      - name: Deploy preview to gh-pages (pr-<NUM>)
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./ # 👈 O solo blueprints/ si prefieres
+          destination_dir: pr-${{ github.event.pull_request.number }}
+
+      - name: Comment PR with Preview URL
+        uses: marocchino/sticky-pull-request-comment@v2
+        with:
+          message: |
+            🚀 PR Preview deployed!
+            👉 [View it here](https://<USERNAME>.github.io/<REPO>/pr-${{ github.event.pull_request.number }}/)