test(chat): a real-editor check for the working aura

scripts/working-aura-editor-check.js runs the dev build with this extension and a stand-in provider that
holds each turn open, and checks in the chat webview: working (the class, both rings shown, the animation
running, the angle moving, a turn of 1.6-3 s), idle, waiting on an approval card (still, no glow), after the
approval, reduced motion (no animation), the setting off (no light), and no page exceptions. It saves
screenshots; --theme picks a colour theme.

Ran on macOS: 9/9 in the default dark theme and in LevelCode One Light.

Author: ndemianc