When the loading slider is enabled, the rendering of `application.hbs` is slightly delayed compared to the old 'spinner' strategy. This means that if a route tried to render a dialog during its `model()` hook, the dialog wrapper element would not be present and an error would occur.
This commit detects that situation and delays rendering the error until the next runloop iteration. If the element is still not found, we print a useful error to the console.
In the long term, we should ideally convert the dialog service to use a pure-ember rendering strategy instead of leaning on a11y-dialog. But for now, this workaround should resolve the problems identified by the chat system specs.
We often have the need to use rich HTML in dialog messages (to show lists, icons, etc.). Previously, our only option was to wrap the message in an `htmlSafe()` call. This PR adds the ability to pass a component name and model to the dialog, which means that we can write the HTML in regular Ember components.
Example, whereas previously we would do this:
```
this.dialog.deleteConfirm({
message: htmlSafe(`<li>Some text</li>`),
});
```
instead we can now do this:
```javascript
import SecondFactorConfirmPhrase from "discourse/components/dialog-messages/second-factor-confirm-phrase";
...
this.dialog.deleteConfirm({
title: I18n.t("user.second_factor.disable_confirm"),
bodyComponent: SecondFactorConfirmPhrase,
bodyComponentModel: model,
})
```
The model passed to the component is optional and will be available as `@model` in the Handlebars template.
In this PR, we introduced an option, that when all authenticators are disabled, but backup codes still exists, user can authenticate with those backup codes. This was reverted as this is not expected behavior.
https://github.com/discourse/discourse/pull/18982
Instead, when the last authenticator is deleted, backup codes should be deleted as well. Because this disables 2fa, user is asked to confirm that action by typing text.
In addition, UI for 2fa preferences was refreshed.
