Set QT_QPA_PLATFORM for Linux environment

it was originally in the i used chatgpt branch but its like 3 lines of code and i think i coded those three lines myself :0 not sure though. anyway kinda required because otherwise linux breaks

Author: Precontation

main.py

@@ -4,6 +4,10 @@
 from PySide6.QtCore import QTimer, QEvent, Qt
 import qframelesswindow
 import time
+import os
+
+if (sys.platform == 'linux'):
+    os.environ.setdefault("QT_QPA_PLATFORM", "xcb")
 
 BOUNCE_FACTOR = 0.9
 GRAVITY = 9.8
@@ -201,4 +205,4 @@ def update_physics(self):
     for win in wins:
         win.show()
         win.installEventFilter(win)
-    app.exec()
+    app.exec()