fix: Increase scanner buffer size to 5MB and add error logging to prevent silent capture failures

internal/capture/local.go

@@ -125,6 +125,11 @@ func (c *LocalCapturer) Close() error {
 
 func (c *LocalCapturer) processStream(r io.Reader) {
 	scanner := bufio.NewScanner(r)
+	// Increase buffer size to handle large packets (default is 64KB)
+	const maxCapacity = 5 * 1024 * 1024 // 5MB
+	buf := make([]byte, 0, 64*1024)
+	scanner.Buffer(buf, maxCapacity)
+
 	var buffer strings.Builder
 	inSIPMessage := false
 	var msgNetInfo *NetInfo
@@ -199,6 +204,13 @@ func (c *LocalCapturer) processStream(r io.Reader) {
 	if buffer.Len() > 0 {
 		c.parseAndEmit(buffer.String(), msgNetInfo)
 	}
+
+	if err := scanner.Err(); err != nil {
+		logger.Error("Scanner error: %v", err)
+		if c.OnError != nil {
+			c.OnError(fmt.Errorf("scanner error: %w", err))
+		}
+	}
 }
 
 func (c *LocalCapturer) processErrors(r io.Reader) {