fix(frontend): resolve React 18 type errors

- Add children prop to components that lost implicit children (React.FC)
- Fix ReactNode type narrowing (Date, bigint, object, function types)
- Replace waitForNextUpdate with waitFor in renderHook tests (RTL 14)
- Add @ts-expect-error for react-dnd DndProvider children prop
- Forward ref in CustomListItem for dnd-kit sortable
- Fix icon prop types to use ReactNode
- Update ui-overrides root.context.provider type for children

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

superset-frontend/plugins/plugin-chart-ag-grid-table/src/renderers/TextCellRenderer.tsx

@@ -70,5 +70,5 @@ export const TextCellRenderer = (params: CellRendererProps) => {
     }
   }
 
-  return <div>{valueFormatted ?? value}</div>;
+  return <div>{valueFormatted ?? (value instanceof Date ? value.toISOString() : value)}</div>;
 };