fix: Drag preview blocking drops when overlapping the editor (BLO-996) (#2670)

Author: matthewlipski

packages/core/src/editor/editor.css

@@ -80,6 +80,11 @@
    hidden. So setting it to an extremely low value instead makes the element
    functionally invisible while not affecting the drag preview itself. */
   opacity: 0.001;
+  /* The element is kept in the DOM after setDragImage captures its snapshot,
+   so it can overlap the editor and block drops in that area. Disabling
+   pointer-events lets drag/drop events pass through to the editor while
+   leaving the captured preview unaffected. */
+  pointer-events: none;
 }
 
 .bn-editor .bn-collaboration-cursor__base {