Create: Diagram

**Added:** - The canvas position (pan) and zoom level are now saved when closing the diagram and restored upon reopening. **Changed:** - Bézier connection curves are now rendered much smoother and cleaner. - Optimized data processing and rendering to significantly reduce resource usage while the diagram is open. **Fixed:** - Output tooltips now correctly display their exact drop probability percentage. - Fixed the Z-index of certain icons that were rendering too high. - Newly created sticky notes now correctly default to a white background instead of inheriting the active color from the drawing toolbar. - Fixed an issue where sticky notes could not be resized back to their original height due to an incorrect minimum limit.