feat(pills): ON-AIR armable signed-out; Start face reads Sign-In while armed signed-out (Good Dog 2026-09-20 ruling, ai.md updated same commit)

Controls/TopBar.xaml

@@ -39,14 +39,16 @@
             <ToggleButton Style="{StaticResource PillToggle}" VerticalAlignment="Center"
                           Margin="6,0,16,0"
                           IsChecked="{Binding RecordPillOn}"/>
-            <!-- ON-AIR group: greyed out until signed in -->
+            <!-- ON-AIR group: armable signed-out (creator ruling 2026-09-20: a
+                 greyed pill was a dead end — the pill is intent and intent must
+                 be able to light while offline). The Start face turns the armed
+                 pill signed-out into a sign-in. -->
             <Ellipse Width="12" Height="12" VerticalAlignment="Center"
                      Fill="{Binding OnAirBrush}"/>
             <TextBlock Text="ON-AIR" Style="{StaticResource StatusSignText}"/>
             <ToggleButton Style="{StaticResource PillToggle}" VerticalAlignment="Center"
                           Margin="6,0,0,0"
                           IsChecked="{Binding OnAirPillOn}"
-                          IsEnabled="{Binding CanToggleOnAir}"
                           ToolTip="{Binding AccountStatusLightToolTip}"/>
             <Border Background="#8f1f1f" CornerRadius="3" Padding="6,1" Margin="8,0,0,0"
                     VerticalAlignment="Center"
@@ -92,7 +94,7 @@
             </Border>
             <!-- Primary Start button: the always-present idle action (sign-in moved
                  into its context menu — a bare bar after stopping was a dead end) -->
-            <Button Content="Start" Style="{StaticResource YtButton}"
+            <Button Content="{Binding PrimaryStartButtonLabel}" Style="{StaticResource YtButton}"
                     Command="{Binding StartStreamCommand}"
                     Visibility="{Binding ShowPrimaryStartButton, Converter={StaticResource BoolToVis}}">
                 <Button.ContextMenu>