Href UX is confusing with bindings

[kof]

Discussion
Issues:

1. When adding a binding to the href email field, subject gets disabled, user doesn't know how to bind subject.
2. When binding email toggle group doesn't show what tab was active

Potential solutions:

1. Move binding to the toggle group, then it makes sense that the entire thing is being bound
2. Bind each input separately, then we need to show active toggle and let user bind email/subject individually

[kof]

For anyone finding this isssue: when you bind any of the fields in Href, you can provide any of the options yourself, e.g. email with subject looks like this: hi@gmail.com?subject=123