Sign up now triggers the full onboarding overlay instead of a dialog.
The flow starts with keygen -> download key (logs in) -> profile setup
(kind 0) -> then continues with the existing settings questionnaire
(theme, content, safety, follows, outro).
Added OnboardingContext with useOnboarding().startSignup() hook so any
component can trigger the signup flow. Updated LoginArea, Feed,
LeftSidebar, and FloatingComposeButton to use it instead of
SignupDialog. SignupDialog is no longer imported by any component.
Chad Curtis
1d967b98d0