fix: disable pointer events on overlay content div

- Change pointerEvents from 'auto' to 'none' on overlay inner div
- Prevents tooltip overlays from intercepting bead clicks
- foreignObject has pointer-events:none but inner div was overriding it
- Now clicks properly pass through overlays to underlying beads

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

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

packages/abacus-react/src/AbacusReact.tsx

@@ -1925,7 +1925,7 @@ export const AbacusReact: React.FC<AbacusConfig> = ({
             }}
             className={overlay.className}
           >
-            <div style={{ position: 'relative', pointerEvents: 'auto' }}>
+            <div style={{ position: 'relative', pointerEvents: 'none' }}>
               {overlay.content}
             </div>
           </foreignObject>