fix: resolve memory leaks and crash in macOS camera and screen capture

client/app.go

@@ -1143,8 +1143,10 @@ func (a *App) connectWS() {
 			}
 			err := conn.ReadJSON(&msg)
 			if err != nil {
+				log.Printf("[WS] ReadJSON error: %v", err)
 				break
 			}
+			log.Printf("[WS] Received event: %s", msg.Event)
 
 			switch msg.Event {
 			case "start_screenshot_stream":
@@ -1276,26 +1278,39 @@ func (a *App) startWebcamStream() {
 	go func() {
 		ticker := time.NewTicker(250 * time.Millisecond)
 		defer ticker.Stop()
+		emptyCount := 0
+		sentCount := 0
 
 		for {
 			select {
 			case <-ticker.C:
 				frame := camera.GetFrame()
 				if frame == "" {
+					emptyCount++
+					if emptyCount <= 20 || emptyCount%100 == 0 {
+						log.Printf("[WS] Webcam: no frame available (empty count: %d)", emptyCount)
+					}
 					continue
 				}
+				emptyCount = 0
+				sentCount++
 
 				a.mu.Lock()
 				conn := a.wsConn
 				a.mu.Unlock()
 
 				if conn != nil {
-					_ = conn.WriteJSON(map[string]any{
+					err := conn.WriteJSON(map[string]any{
 						"event": "webcam_stream_frame",
 						"data": map[string]any{
 							"imageBuffer": frame,
 						},
 					})
+					if sentCount <= 5 {
+						log.Printf("[WS] Webcam frame #%d sent (len=%d, err=%v)", sentCount, len(frame), err)
+					}
+				} else if sentCount <= 5 {
+					log.Printf("[WS] Webcam frame #%d: no WS connection", sentCount)
 				}
 			case <-a.streamCamStop:
 				return