feat: add PR link checking workflow

.github/workflows/check-pr-links.yml

@@ -0,0 +1,31 @@
+name: PR Links
+
+on:
+  pull_request:
+    branches: [redesign]
+  workflow_dispatch:
+
+jobs:
+  linkChecker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          persist-credentials: false
+
+      - name: Build site
+        uses: withastro/action@15aa0a5a1e067940253e3b259413ab2ae882a740 # v5.2.0
+
+        with:
+          path: "astro" # TODO: change when Astro site is moved to root
+          package-manager: npm@latest
+          node-version: 24.13
+
+      - name: Check links
+        uses: lycheeverse/lychee-action@a8c4c7cb88f0c7386610c35eb25108e448569cb0 # v2.7.0
+        with:
+          workingDirectory: astro # TODO: change when Astro site is moved to root
+          args: |
+            --root-dir $PWD/dist
+            dist/
+          fail: true