chore: release v0.19.4

internal/cat/cat.go

@@ -205,11 +205,12 @@ func (m *Manager) SetPTT(on bool) error {
 // the backend picks a default when it's empty. (Status-based colouring can be
 // driven later by setting Color per spot.)
 type SpotInfo struct {
-	FreqHz   int64
-	Callsign string
-	Mode     string
-	Color    string
-	Comment  string
+	FreqHz      int64
+	Callsign    string
+	Mode        string
+	Color       string
+	Comment     string
+	LifetimeSec int // panadapter display seconds before auto-removal (0 = backend default)
 }
 
 // Spotter is an OPTIONAL backend capability: show cluster spots on the radio