Opaque LoginPage type

Construct an empty LoginPage

Set the login form title

Set an optional subtitle below the title

Set optional brand/product name displayed above the card

Set the username field label

Set the password field label

Set the remember-me checkbox label

Set the submit button label

Set the current username value

Set the current password value

Show the password in plain text (True) or masked (False)

Set the remember-me checkbox state

Set the message sent when the username field changes

Set the message sent when the password field changes

Set the message sent when "show password" is toggled

Set the message sent when the remember-me checkbox is toggled

Set the message sent when the submit button is clicked

Set helper/error text displayed above the submit button

Add footer links (e.g. "Forgot password?", "Create account")

Render the LoginPage as an Element msg