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Add real-event frontend histories for grid direction, cell alignment and justification through main edits, update-main and reset. Check whole-group override retention, clean children and one-step exact undo/redo for all thirteen user actions. Compare cells through source identities against explicit expectations without production assignment helpers. Register the new namespace in both frontend runner lists. Validation: focused histories pass 151 assertions; the full frontend suite passes 1,747 tests and 13,720 assertions. Frontend lint and format pass. AI-assisted-by: gpt-6