fix: small bug for PGXL fan and ultrabeam direction

internal/powergenius/powergenius.go

@@ -45,6 +45,10 @@ type Client struct {
 
 	statusMu sync.RWMutex
 	status   Status
+	// Optimistic fan mode kept until the amp's status poll confirms it (or it
+	// ages out) — otherwise a stale poll right after a change reverts the UI.
+	fanPending   string
+	fanPendingAt time.Time
 
 	cmdID   atomic.Int64
 	stop    chan struct{}
@@ -102,7 +106,10 @@ func (c *Client) SetFanMode(mode string) error {
 	if _, err := c.command("setup fanmode=" + m); err != nil {
 		return err
 	}
-	c.setStatus(func(s *Status) { s.FanMode = m }) // optimistic
+	c.statusMu.Lock()
+	c.status.FanMode = m // optimistic
+	c.fanPending, c.fanPendingAt = m, time.Now()
+	c.statusMu.Unlock()
 	return nil
 }
 
@@ -217,7 +224,13 @@ func (c *Client) parse(resp string) {
 		case "state":
 			c.status.State = kv[1]
 		case "fanmode":
-			c.status.FanMode = strings.ToUpper(kv[1])
+			dev := strings.ToUpper(kv[1])
+			// Honour a recent optimistic change until the amp confirms it.
+			if c.fanPending != "" && time.Since(c.fanPendingAt) < 3*time.Second && dev != c.fanPending {
+				break
+			}
+			c.fanPending = ""
+			c.status.FanMode = dev
 		case "temp":
 			c.status.Temperature, _ = strconv.ParseFloat(kv[1], 64)
 		}