Fix qt widget attribute error in windows

[gitttt-1234]

Previously, on Windows, loading an .slp file would throw an error because the code iterated over all menu.children(), which on Windows includes a QGraphicsDropShadowEffect object. This object doesn’t have a .text() or .setChecked() method, leading to the crash.

[<function MainWindow._create_menus.<locals>.add_submenu_choices.<locals>.<lambda> at 0x00000187FF0BD440>, <function MainWindow._load_overlays.<locals>.overlay_state_connect.<locals>.<lambda> at 0x0000018783954FE0>, <bound method MainWindow.plotFrame of <sleap.gui.app.MainWindow(0x187f97e5660) at 0x00000187FED65280>>, <function MainWindow._load_overlays.<locals>.<lambda> at 0x00000187839551C0>, <function MainWindow._load_overlays.<locals>.<lambda> at 0x0000018783955260>, <function MainWindow._load_overlays.<locals>.overlay_state_connect.<locals>.<lambda> at 0x00000187FEEC8AE0>, <bound method MainWindow.plotFrame of <sleap.gui.app.MainWindow(0x187f97e5660) at 0x00000187FED65280>>, <function MainWindow._load_overlays.<locals>.<lambda> at 0x0000018783955580>, <function MainWindow._load_overlays.<locals>.<lambda> at 0x0000018783955760>]
'PySide6.QtWidgets.QGraphicsDropShadowEffect' object has no attribute 'text'
Error occurred during callback 0 for distinctly_color!

The fix updates the logic to only check action objects using menu.actions(), ensuring that only action items are processed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.45%. Comparing base (5d9f04a) to head (0afdcb5).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2440      +/-   ##
===========================================
+ Coverage    59.43%   59.45%   +0.01%     
===========================================
  Files           68       68              
  Lines        13219    13219              
===========================================
+ Hits          7857     7859       +2     
+ Misses        5362     5360       -2     

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