- Introduce MgEditState enum and expose EditState on IMgGridBase
- Replace event-based syncing state with property-based state
- Redesign MgGridInfoPanel to support both view and edit modes with dynamic DevExpress editors and two-way binding
- Add visual distinction for edit/view modes in info panel
- Replace FruitBankToolbarTemplate with generic MgGridToolbarTemplate; toolbar adapts to grid edit/sync state
- Update all grid usages to use new toolbar
- Improve robustness, error handling, and maintainability throughout grid, info panel, and toolbar code
