feat(topbar): the recording lives in the pill — green pulse, REC clock, Stop Recording

Build 730 (creator):

- Left pill while recording: solid #2ECC71 dot pulsing 1.0 <-> 0.2 on the existing one-second timer, and
  "REC: hh:mm:ss" in Consolas so the digits cannot jitter the pill's width. Idle face unchanged.
- Right pill while recording: a stop square and "Stop Recording"; clicking it runs the normal stop, which
  halts and resets the clock and returns the pair to "Local MP4" / "Start Recording".
- The separate reality line (dot + REC/LIVE + elapsed + End) is now LIVE-ONLY: a recording would otherwise
  print the same three facts twice. RunningVisible is IsLive, and ShowOutputStage no longer hides itself
  for a recording (it must be on screen to carry the clock and the stop).

Two rules collided and are now separated rather than merged: a creator's Stop on a recording restores the
Local MP4 pair (build 730), while a pipeline FAILURE still clears both pills (the 2026-09-01 zombie rule).
StopStream(afterFailure:) carries the difference, and the pump-failure path passes it.

RealAppHost.Run was rethrowing with `throw failure;`, which destroyed the original stack — a failing
assertion inside the action reported the wrapper's line instead of its own. ExceptionDispatchInfo now
preserves it; that is how the two failures above were located in one pass instead of five.

680 pass (one audio-pipe instance flake under full-suite load, passes alone), 0 warnings.
Scope justification: Assets/starting-background.jpg is outside this unit — the creator's replacement art,
still awaiting their visual check.

Themes/Tokens.xaml

@@ -44,6 +44,8 @@
     <SolidColorBrush x:Key="Brush.SegmentIconActive" Color="#F26D6D"/>
     <!-- One-alpha black: transparent to the eye, opaque to hit-testing, so the whole segment is clickable. -->
     <SolidColorBrush x:Key="Brush.SegmentHitArea" Color="#01000000"/>
+    <!-- The recording dot on the output pill (creator, build 730). -->
+    <SolidColorBrush x:Key="Brush.RecordLive" Color="#2ECC71"/>
 
     <SolidColorBrush x:Key="Brush.Primary" Color="#ff5451"/>
     <SolidColorBrush x:Key="Brush.PrimaryContainer" Color="#b91a24"/>