fix(player): use live device name in zone-candidate list

HandleGetZoneCandidates read entry.Device.DeviceInfo (the immutable
discovery-time snapshot) directly instead of Info(), missed when every
other handler in this file was migrated to the live-name accessor. A
speaker renamed after discovery kept showing its stale name in the
"add to my zone" picker indefinitely.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

pkg/service/soundtouchweb/handler.go

@@ -1368,11 +1368,16 @@ func (app *WebApp) HandleGetZoneCandidates(w http.ResponseWriter, r *http.Reques
 	candidates := make(map[string]zoneCandidate)
 
 	for _, entry := range app.DeviceSnapshot() {
-		if entry.Device == nil || entry.Device.DeviceInfo == nil {
+		if entry.Device == nil {
 			continue
 		}
 
-		candidates[entry.ID] = zoneCandidate{Info: entry.Device.DeviceInfo}
+		info := entry.Device.Info()
+		if info == nil {
+			continue
+		}
+
+		candidates[entry.ID] = zoneCandidate{Info: info}
 	}
 
 	w.Header().Set("Content-Type", "application/json")