fix(core): allow empty table rows so merging every cell doesn't add a column - #3151

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

packages/react/src/hooks/useEditorFocus.ts:57:5: Cannot access refs during render

packages/react/src/hooks/useEditorFocus.ts:56:5: Cannot access refs during render

packages/react/src/hooks/useEditorFocus.ts:56:5: Cannot access refs during render

packages/react/src/hooks/useEditorFocus.ts:56:5: Cannot access refs during render

tests/src/unit/react/testSchema.tsx:57:20: Cannot access refs during render

packages/react/src/components/SuggestionMenu/hooks/useLoadSuggestionMenuItems.ts:24:5: Calling setState synchronously within an effect can trigger cascading renders

packages/react/src/components/SuggestionMenu/hooks/useLoadSuggestionMenuItems.ts:44:16: Cannot access refs during render

packages/react/src/components/SuggestionMenu/hooks/useLoadSuggestionMenuItems.ts:44:16: Cannot access refs during render

packages/react/src/components/SuggestionMenu/hooks/useLoadSuggestionMenuItems.ts:46:7: Cannot access refs during render

packages/react/src/components/SuggestionMenu/GridSuggestionMenu/hooks/useGridSuggestionMenuKeyboardNavigation.ts:88:5: Calling setState synchronously within an effect can trigger cascading renders

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