Nested artboard fixes

Fixes and improvements

• Resolved issue that was preventing nested artboards from being displayed in parent artboards in some customers' files.

• Fixed issue with desktop app showing a blank gray screen when making edits while the graph editor was open, as well as when interacting with the desktop app while the rulers were enabled.

• Attempting to open a file when the project is over the file limit by loading the file’s URL will now show an error in the web app instead of crashing the editor.

• Fixed issue in which artboard X could block pointer events from artboard Y if artboard X had a shape without paths and a few other very edge-case conditions were met.

• Resolved issue with distance constraint changes in a nested artboard not updating in the parent artboard.