The single HostStatusText/JoinStatusText line gave no sense of where
the user was in the flow. Replaced with a step list:
- StartupStep model (INotifyPropertyChanged) tracks Title, State
(Pending/Active/Done/Failed), Detail, optional Progress 0..1
- ItemsControl + DataTemplate in App.xaml renders each step as a
status bullet (empty ring -> filled brand -> green check -> red X),
with conditional detail line + restyled mini progress bar
- StartupFlow.NewHostFlow / NewJoinFlow build the canonical 5-step
host and 2-step join lists; host flow swaps the tunnel step label
for LocalNetwork mode
- OnHostStart / OnJoinApply advance steps via StartStep/CompleteStep/
FailStep helpers and route progress callbacks to UpdateStepProgress
so each download phase has its own bar
- Errors mark the active step Failed with the message inline, leaving
the rest of the list visible so the user sees where it broke
Alexa