[Controls] NodeActions: Keep the buttons visible on the screen when the selected node moves out of the Graph Editor's view

[cbentejac]

Description

This pull request introduces a small but important improvement to the positioning logic for node action headers in the NodeActions.qml file. The update ensures that headers are always displayed within the visible screen area by preventing them from being positioned off-screen.

• Prevented node action headers from being positioned with negative x or y coordinates, ensuring headers always remain within the visible screen area.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.82%. Comparing base (73a9715) to head (c2ca42a).
⚠️ Report is 37 commits behind head on develop.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2952      +/-   ##
===========================================
- Coverage    80.88%   80.82%   -0.06%     
===========================================
  Files           59       59              
  Lines         7857     7844      -13     
===========================================
- Hits          6355     6340      -15     
- Misses        1502     1504       +2     

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