Fix endless "Loading MolForge" spinner: pin @babel/standalone to 7.25.6

The unpinned @babel/standalone CDN URL resolved to the latest Babel 8.x,
which is stricter about raw `>` / `>=` in JSX text and threw "Unexpected
token `>`" — so Babel never compiled the app, React never mounted, and the
loading splash spun forever. Pinning to 7.25.6 restores the version the app
was authored against and prevents future silent CDN upgrades from breaking it.

Verified: app mounts with 25 example compounds, 0 page errors.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: lwang68

molforge_database.html

@@ -1009,7 +1009,7 @@
   <style type="text/tailwindcss">@import "tailwindcss";</style>
   <script crossorigin="" src="https://unpkg.com/react@18/umd/react.development.js"></script>
   <script crossorigin="" src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"></script>
-  <script crossorigin="anonymous" src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
+  <script crossorigin="anonymous" src="https://unpkg.com/@babel/standalone@7.25.6/babel.min.js"></script>
   <script crossorigin="anonymous" src="https://unpkg.com/@rdkit/rdkit/dist/RDKit_minimal.js"></script>
   <script crossorigin="anonymous" src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.18.5/xlsx.full.min.js"></script>
   <script crossorigin="anonymous" src="https://cdn.jsdelivr.net/npm/@tensorflow/tfjs@4.10.0/dist/tf.min.js"></script>
@@ -1349,7 +1349,7 @@
     { url: 'https://cdn.jsdelivr.net/npm/@tailwindcss/browser@4', name: 'Tailwind CSS' },
     { url: 'https://unpkg.com/react@18/umd/react.development.js', name: 'React' },
     { url: 'https://unpkg.com/react-dom@18/umd/react-dom.development.js', name: 'ReactDOM' },
-    { url: 'https://unpkg.com/@babel/standalone/babel.min.js', name: 'Babel' },
+    { url: 'https://unpkg.com/@babel/standalone@7.25.6/babel.min.js', name: 'Babel' },
     { url: 'https://unpkg.com/@rdkit/rdkit/dist/RDKit_minimal.js', name: 'RDKit.js' },
     { url: 'https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.18.5/xlsx.full.min.js', name: 'SheetJS' },
     { url: 'https://cdn.jsdelivr.net/npm/@tensorflow/tfjs@4.10.0/dist/tf.min.js', name: 'TensorFlow.js' },