Fix: restore AG Grid script tag removed by mistake

Sources/Versions/Log grids still use AG Grid — only the Forecast
pivot was replaced with Perspective.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

public/index.html

@@ -282,6 +282,7 @@
     </div>
 </div>
 
+<script src="https://cdn.jsdelivr.net/npm/ag-grid-enterprise@31.0.0/dist/ag-grid-enterprise.min.js"></script>
 <script src="app.js"></script>
 </body>
 </html>