Fix GitHub Pages deployment path

Update workflow to upload dist/spa directory where Vite actually builds
the static files, instead of the parent dist directory. This resolves
the 404 error on GitHub Pages.

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

Author: initcron

.github/workflows/deploy.yaml

@@ -53,7 +53,7 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: dist
-          path: dist
+          path: dist/spa
           retention-days: 1
 
   deploy: