Update Node.js to 24 LTS (#2)

Node.js 24 is now the Active LTS version (Krypton).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <noreply@anthropic.com>

Author: MaxGhenis

.github/workflows/nextjs.yml

@@ -51,7 +51,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
-          node-version: "20"
+          node-version: "24"
           cache: ${{ steps.detect-package-manager.outputs.manager }}
       - name: Setup Pages
         uses: actions/configure-pages@v5