fix: end QPainter in finally block to prevent resource leak

main.py

@@ -82,6 +82,7 @@ class TimelineWidget(QWidget):
 
     def paintEvent(self, event):
         p = QPainter(self)
+        try:
             w, h = self.width(), self.height()
 
             # Background
@@ -100,6 +101,8 @@ class TimelineWidget(QWidget):
             pen.setWidth(2)
             p.setPen(pen)
             p.drawLine(x_start, 0, x_start, h)
+        finally:
+            p.end()
 
     def mousePressEvent(self, event):
         self._seek(event.position().x())