chore(k1): checkpoint connection recovery work

apps/control-station/src/workspaces/Workspaces.tsx

@@ -157,6 +157,7 @@ function SpatialWorkspace({
   const [showSegmentation, setShowSegmentation] = useState(false);
   const [showCuboids3d, setShowCuboids3d] = useState(false);
   const recordedSource = Boolean(recordedReplay) || /\.rrd(?:$|[?#])/i.test(sourceUrl);
+  const liveRerunSource = !recordedSource && /^rerun\+https?:\/\//i.test(sourceUrl.trim());
   const recordedSessionGate: RecordedAdmissionPhase = recordedSource
     ? recordedSessionAdmission?.phase ?? "loading"
     : "ready";
@@ -165,6 +166,10 @@ function SpatialWorkspace({
       isRecordedPlaybackPresentationReady(viewerStatus, playbackState));
   const streamActive = state?.sourceMode === "live" || state?.sourceMode === "replay";
   const metrics = streamActive ? state?.metrics : undefined;
+  // An explicit manual gRPC source has no Mission Core metrics producer. Its
+  // native Rerun range is therefore the only available activity proof.
+  const livePresentationActivitySequence = metrics?.publishedFrameCount ??
+    (liveRerunSource && !streamActive ? 1 : null);
   const latency = pipelineLatency(metrics);
   const frameRate = finiteMetric(metrics?.frameRateHz);
   const points = finiteMetric(metrics?.pointCount);
@@ -495,8 +500,8 @@ function SpatialWorkspace({
             <RerunViewport
               sourceUrl={sourceUrl}
               recordedArtifact={recordedSource ? recordedReplay : null}
-              followLive={!recordedReplay && streamActive}
-              liveActivitySequence={metrics?.publishedFrameCount}
+              followLive={liveRerunSource}
+              liveActivitySequence={livePresentationActivitySequence}
               liveStreamId={state?.spatialSource?.id}
               liveRecoveryAuthorityIdentity={!recordedSource && streamActive ? liveRerunRecoveryAuthorityIdentity(pointCloudSource, state?.spatialSource) : null}
               autoplayWhenReady={recordedSource}