frontend: editor: Input Widget configuration persists outside edit mode

[ES-Alexander]

Bug description

The right sidebar that opens when configuring an Input Widget does not close until the X is pressed, which means it persists when switching Views in the editor, and even after exiting edit mode entirely:

Steps to reproduce

1. Open Edit Mode
2. Edit an Input Widget
3. Leave Edit Mode
4. The Input Widget edit pane is still there 🥲

Primary pain point(s)

Panes should not persist outside their relevant context, and it makes the software feel clunky when they do.

Additional context

This could get subsumed by larger consistency reworking per #1620 or #1540, but assuming they will take a while to be implemented it's probably still worth fixing in the interim.

Prerequisites

• I have checked to make sure that a similar request has not already been filed or fixed.