fix: include assets in Pages deployment

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: ad1a8872-dbea-4a6c-a0d0-3d0c3431da78

Author: justinyoo

.github/workflows/ci.yml

@@ -36,6 +36,7 @@ jobs:
             --html \
             --allow-local-files \
             -o site/index.html
+          cp -R assets site/assets
 
       - name: Validate PowerShell syntax
         shell: pwsh