Gentle shutdown of application in smoke test

Fixes #58597

Default to replacing the word range in js/ts. This is a change in core behavior so  we'll need to see what the feedback is like for it.

Fixes #66060

The widget is better equipped to know when it is visible or not.

Previously logic only did a check against `this._providers.length` so negative indexes would cause a access exception

Fixes #66059

- Improve variable names
- More const
- More private