fix: add authcontext to browser-ext

[alexmatson-da]

Upon logging in, the UI will directly create an AuthContext based on the token received from login. This context can then be used in the store/controller.

Inside the controller, you will need to check the context whenever you want to use it, example:

const context = await AuthService.loadAuthContext()
if (!context) {
    throw new Error(
        'No auth context found. User must be authenticated.'
    )
}

Fixes #2342