ci: add GitHub Pages deploy and PR build workflows

deploy.yml builds with Vite and publishes dist/ to GitHub Pages on push to main; ci.yml runs a build check on pull requests.

Author: BenAlaa

.github/workflows/ci.yml

@@ -0,0 +1,21 @@
+name: CI
+
+# Build check for pull requests so nothing merges to main unless it builds.
+on:
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+      - run: npm ci
+      - run: npm run build

.github/workflows/deploy.yml

@@ -0,0 +1,43 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+# Allow the GITHUB_TOKEN to deploy to Pages and mint an OIDC token.
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# One live deployment at a time; let a newer run supersede an in-progress one.
+concurrency:
+  group: pages
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+      - run: npm ci
+      - run: npm run build
+      - uses: actions/configure-pages@v5
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: dist
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - id: deployment
+        uses: actions/deploy-pages@v4