[bugfix] Fix profile_level_icon_widget paintEvent

when running seraphine from code, a error occurred:
QPaintDevice: Cannot destroy paint device that is being
painted.

the traceback shows that the parameter type of self.image.scaled()
should be int, but actually self.sep is float.

changes are as follows:
1. convert self.sep from float into int explicitly.
2. ignore virtual environment. (e.g. venv and seraphine)

.gitignore

@@ -20,4 +20,8 @@ mymake.ps1
 render.html
 
 # 忽略日志文件
-log
+log
+
+# 忽略虚拟环境
+venv
+seraphine

app/components/profile_level_icon_widget.py

@@ -88,8 +88,8 @@ def paintEvent(self, event):
         painter.setRenderHint(QPainter.Antialiasing)
 
         scaledImage = self.image.scaled(
-            self.width() - self.sep,
-            self.height() - self.sep,
+            self.width() - int(self.sep),
+            self.height() - int(self.sep),
             Qt.AspectRatioMode.KeepAspectRatioByExpanding)
 
         clipPath = QPainterPath()
@@ -98,7 +98,7 @@ def paintEvent(self, event):
                             self.height() - self.sep)
 
         painter.setClipPath(clipPath)
-        painter.drawImage(self.sep // 2, self.sep // 2, scaledImage)
+        painter.drawImage(int(self.sep // 2), int(self.sep // 2), scaledImage)
 
     def updateIcon(self, icon: str, xpSinceLastLevel=None, xpUntilNextLevel=None, text=""):
         self.image = QImage(icon)