Sync: keep the remembered sign-in when the provider is merely down, and say why SYNC NOW found the machine offline

src/DodoSSH.Client.App/Views/SettingsPreferencesPage.axaml

@@ -87,6 +87,11 @@
                 <TextBlock Classes="settingsrowtitle" Text="Synchronise" />
                 <TextBlock Classes="settingsrowcaption"
                            Text="Runs a pass now. One runs on its own when the keychain opens, straight after any change, and every minute while it stays open." />
+                <!-- What SYNC NOW said. The status bar that carries it elsewhere is hidden in settings
+                     mode, so without this the button ran, failed or found the machine offline in silence. -->
+                <TextBlock Classes="settingsrowcaption"
+                           IsVisible="{Binding Vault.Status, Converter={x:Static StringConverters.IsNotNullOrEmpty}, FallbackValue=False}"
+                           Text="{Binding Vault.Status}" />
               </StackPanel>
               <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="8">
                 <Button Classes="ghost" Height="38" Content="SIGN IN" Command="{Binding SignInCommand}"