Request: Side panel in EW should match layout's .85 max-width

[pgoodrich]

da-nx/nx2/utils/panel.js

Line 4 in fe5e950

const PANEL_WIDTH_MAX = () => Math.min(1600, window.innerWidth * 0.4);

sets the max width of the panel to .4 of the window innerWidth. This is quite small for the plugins we want to implement. Our use cases are a downstream app preview (consumes EDS content) and Target campaign management within the panel.

Ideally this would like work more like Layout view where I can freely drag the panel size to have up to more like a 85-15 panel split.