feat(stream): RECONNECTING driven by the status poll — no invented countdown (TASK 32·2)

Creator challenge (2026-11-05): "I really don't think that's going to be a constant — it's going to
depend on so many variables, some that are dark to us." Correct, so the measured-grace constant and
the countdown are dropped from the spec. YouTube's cutoff is server-side and depends on ingest health,
prior stream quality, region and load; a pinned number would be a guess wearing a timer, and it would
be wrong exactly when the creator is staring at it.

What ships instead:

- **Amber RECONNECTING** in the top bar with measured facts only: elapsed seconds and the attempt
  number ("0:12 · attempt 2 of 4"). The seconds come from a stopwatch started at the drop.
- **The status poll speeds up while recovering** (30 s → 4 s) and drives the sign; it restores 30 s
  when recovery ends.
- **`chatEndedEvent`** — already in the chat feed we poll and previously skipped — now raises a signal
  that prompts an immediate status check. It never decides anything: `liveBroadcasts.list`
  `lifeCycleStatus` stays authoritative, with `liveStreams.list` health as the push-received signal.
- At `complete`: red OFF AIR (the existing stop path) rather than a pretend-live sign.

Tests: `ChatEndedSignalTests` (the marker is not a chat row, the service raises the signal, and a
complete broadcast ends recovery with the honest message). FAST gate: 543 passed, 0 warnings.

Controls/TopBar.xaml

@@ -120,6 +120,12 @@
                            Foreground="White" Margin="8,0,0,0" VerticalAlignment="Center"/>
                 <TextBlock Text="{Binding LiveElapsedText}" Foreground="White" FontSize="14"
                            FontFamily="Consolas" VerticalAlignment="Center" Margin="8,0,0,0"/>
+                <!-- TASK 32·2: measured facts only — elapsed seconds and which attempt. No countdown:
+                     YouTube's cutoff is not a constant we can promise. -->
+                <TextBlock x:Name="ReconnectDetail" Text="{Binding ReconnectDetailText}"
+                           Foreground="{StaticResource Brush.Attention}" FontSize="13"
+                           FontFamily="Consolas" VerticalAlignment="Center" Margin="10,0,0,0"
+                           Visibility="{Binding IsReconnecting, Converter={StaticResource BoolToVis}}"/>
                 <Button Content="{Binding EndButtonText}" Style="{StaticResource YtButton}"
                         Background="{StaticResource Brush.Primary}" Margin="14,0,0,0"
                         Command="{Binding EndStreamCommand}"/>