ci: add manual workflow to regenerate landing page screenshots

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/screenshots.yml

@@ -0,0 +1,47 @@
+name: Screenshots
+
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  screenshots:
+    name: Capture Landing Page Screenshots
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+        with:
+          version: latest
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+
+      - run: pnpm install --frozen-lockfile
+
+      - name: Install Playwright with system deps
+        run: pnpm exec playwright install --with-deps chromium
+
+      - name: Build app
+        run: pnpm build
+        env:
+          DATABASE_URL: ./data/screenshots.db
+
+      - name: Capture screenshots
+        run: pnpm exec tsx scripts/screenshots.ts
+        env:
+          DATABASE_URL: ./data/screenshots.db
+
+      - name: Commit and push
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add website/assets/screenshot-*.png
+          git diff --cached --quiet && echo "No changes" && exit 0
+          git commit -m "chore: update landing page screenshots [skip ci]"
+          git push