Add GitHub Actions workflow for GitHub Pages deployment

- Auto-deploy on push to main branch
- Manual trigger via workflow_dispatch
- Uses Node.js 20, npm ci for reproducible builds
- Deploys dist/ folder to GitHub Pages

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/deploy.yml

@@ -1,21 +1,28 @@
+# Deploy to GitHub Pages
 name: Deploy to GitHub Pages
 
 on:
+  # Runs on pushes targeting the default branch
   push:
-    branches:
+    branches: ["main"]
-      - main
+
+  # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
 
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
 permissions:
   contents: read
   pages: write
   id-token: write
 
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
 concurrency:
   group: "pages"
   cancel-in-progress: false
 
 jobs:
+  # Build job
   build:
     runs-on: ubuntu-latest
     steps:
@@ -25,8 +32,11 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: "20"
-          cache: 'npm'
+          cache: "npm"
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
 
       - name: Install dependencies
         run: npm ci
@@ -34,14 +44,12 @@ jobs:
       - name: Build
         run: npm run build
 
-      - name: Setup Pages
-        uses: actions/configure-pages@v4
-
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
         with:
-          path: 'dist'
+          path: ./dist
 
+  # Deployment job
   deploy:
     environment:
       name: github-pages