App stays in drag mode after user mouses up outside the grid

[tyler-dane]

Where did this happen?

hosted

Expected Behavior

When mousing up while DNDing an event, we should stop DNDing

Current Behavior

bug-mouseup.mov

Steps to Reproduce

1. Drag a grid event outside the grid
2. Release
3. Expected: stops dragging
4. Actual: keeps dragging

Possible Solution

This can be avoided by restricting the mouse position to valid drop zones during drags

Context

Related to #1786