feat(menu): add edit menu bar layout to secondary context menu

[nightah]

What does this PR do?

Add "Edit Menu Bar Layout" option to the secondary context menu, linking directly to the Menu Bar Layout settings pane. Remove ellipsis from the existing appearance option and update both icons to match the settings sidebar.

PR Type

• Bugfix
• CI/CD related changes
• Code style update (formatting, renaming)
• Documentation
• Feature
• i18n/l10n (Translation/Localization)
• Refactor
• Performance improvement
• Test addition or update
• Other (please describe):

Does this PR introduce a breaking change?

• Yes
• No

What is the current behavior?

The secondary context menu (right-click on empty menu bar space) only has "Edit Menu Bar Appearance…" with a paintbrush icon. There is no quick access to the Menu Bar Layout settings from the context menu.

What is the new behavior?

• "Edit Menu Bar Appearance" (ellipsis removed) now uses the swatchpalette icon, matching the settings sidebar
• New "Edit Menu Bar Layout" option with the rectangle.topthird.inset.filled icon opens the settings window directly to the Menu Bar Layout pane
• Existing localizations migrated from the stale key to the updated one

PR Checklist

• I've built and run the app locally
• I've checked for console errors or crashes
• I've run relevant tests and they pass
• I've added or updated tests (if applicable)
• I've updated documentation as needed
• I've verified localized strings work correctly (if i18n/l10n changes)

Other information

Closes #344.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud