fix(data-grid): prevent column header sorting popover from closing when cell is focused (#1114)

* fix: prevent column header sorting popover from closing when cell is focused

Expand getIsInPopover to include Radix dropdown and popover content. When
a cell was focused and the user clicked a column header to sort, the
grid's focusout handler was stealing focus back to the cell because the
dropdown content wasn't recognized as a valid popover. This caused the
sorting popover to close immediately.

Fixes #1108

Co-authored-by: Cursor <cursoragent@cursor.com>

* chore: sync

---------

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: sadmann7

src/lib/data-grid.ts

@@ -257,10 +257,13 @@ export function scrollCellIntoView<TData>(params: {
 }
 
 export function getIsInPopover(element: unknown): boolean {
+  if (!(element instanceof Element)) return false;
+
   return (
-    element instanceof Element &&
-    (element.closest("[data-grid-cell-editor]") ||
-      element.closest("[data-grid-popover]")) !== null
+    element.closest("[data-grid-cell-editor]") !== null ||
+    element.closest("[data-grid-popover]") !== null ||
+    element.closest("[data-slot='dropdown-menu-content']") !== null ||
+    element.closest("[data-slot='popover-content']") !== null
   );
 }