Prevent hiding menubar on macOS

[droidmonkey]

• Fixes Unhide menu bar? #10706

Testing strategy

Tested on macOS, phantom menu no longer appears even if HideMenubar=true is set in the config.

Type of change

• ✅ Bug fix (non-breaking change that fixes an issue)

[Copilot]

Pull request overview

Prevents the menubar from being hidden on macOS, where the menubar is a system-level element and hiding it causes a "phantom menu" issue (#10706).

Changes:

• Skips setting menubar max height to 0 on macOS in applySettingsChanges
• Short-circuits the Alt-key menubar toggle event filter on macOS
• Hides the "Show Menubar" checkbox in settings on macOS to avoid user confusion

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/gui/MainWindow.cpp	Guards menubar-hiding logic and Alt-key toggle with #ifndef Q_OS_MACOS
src/gui/ApplicationSettingsWidget.cpp	Hides the menubar visibility checkbox on macOS

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.57%. Comparing base (40c79f5) to head (eec73e3).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #13147      +/-   ##
===========================================
- Coverage    64.60%   64.57%   -0.03%     
===========================================
  Files          378      378              
  Lines        39911    39913       +2     
===========================================
- Hits         25783    25772      -11     
- Misses       14128    14141      +13     

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