fix: reconcile stale detection streams

internal/tui/model.go

@@ -176,7 +176,12 @@ func (m Model) Update(message tea.Msg) (tea.Model, tea.Cmd) {
 		}
 		if progress.closed {
 			// A stale Application generation closes without claiming an
-			// authoritative completion snapshot.
+			// authoritative completion snapshot. Reconcile with the Application
+			// so this Model does not strand rows in its superseded Checking frame.
+			formerCatalog := newTargetCatalog(m.snapshot, m.showUnavailable, m.selectedTargetID)
+			formerIndex := formerCatalog.index(m.selectedTargetID)
+			m.snapshot = m.application.Snapshot()
+			m.selectedTargetID = newTargetCatalog(m.snapshot, m.showUnavailable, m.selectedTargetID).retain(m.selectedTargetID, formerIndex)
 			m.refreshing = false
 			m.detectionUpdates = nil
 			return m, m.deferredQuit()

internal/tui/progressive_detection_test.go

@@ -99,6 +99,28 @@ func TestCompleteModelStreamsStartupAndRefreshByTargetWithoutMovingSelection(t *
 	}
 }
 
+func TestCompleteModelReconcilesAuthoritativeSnapshotWhenDetectionGenerationClosesStale(t *testing.T) {
+	startup := make(chan app.TargetDetectionUpdate)
+	module := &progressiveDetectionModule{
+		snapshot: app.Snapshot{Targets: []app.TargetSnapshot{{
+			ID: "shell", Description: target.Description{Name: "Shell", Summary: "Shell description"},
+		}}},
+		streams: []chan app.TargetDetectionUpdate{startup},
+	}
+	model := resizedModel(t, module, themeModeNoColor, 80, 24)
+	assertUsableFrame(t, model.View(), 80, 24, "> … Checking  Shell")
+
+	// A newer Application generation has already established the authoritative
+	// result, so the stale stream closes without publishing a completion update.
+	_ = module.detectionUpdate("shell", app.TargetReady, true, target.Enabled, "shell enabled", nil)
+	close(startup)
+	model, next := applyDetectionCommand(t, model, model.Init())
+	if next != nil || model.refreshing {
+		t.Fatalf("stale closure left detection active: next=%v refreshing=%v", next != nil, model.refreshing)
+	}
+	assertUsableFrame(t, model.View(), 80, 24, "> ● Enabled  Shell", "Evidence: shell enabled")
+}
+
 func (m *progressiveDetectionModule) detectionUpdate(id string, phase app.TargetDetectionPhase, available bool, state target.State, evidence string, err error) app.TargetDetectionUpdate {
 	for i := range m.snapshot.Targets {
 		if m.snapshot.Targets[i].ID != id {