Add right-click context menu to open settings folder in Explorer

[smz202000]

Summary of the Pull Request

Adds a right-click context menu to the "Open JSON file" button in the Settings UI. When right-clicked, it shows a menu item "Open settings folder" that opens the parent folder of the settings.json file in File Explorer.

References

Closes #12382

Detailed Description

The backend support for SettingsTarget::Directory was already fully implemented in TerminalPage::_LaunchSettings — it calls openFolder() with CascadiaSettings::SettingsDirectory(). This change simply adds the UI to trigger it:

1. MainPage.xaml: Added a ContextFlyout with a MenuFlyoutItem to the OpenJsonNavItem. The flyout appears on right-click and includes a folder icon (Segoe Fluent Icons glyph ).

2. MainPage.h: Added declaration for the OpenSettingsFolder_Click click handler.

3. MainPage.cpp: Added implementation of OpenSettingsFolder_Click which emits the OpenJson event with SettingsTarget::Directory, reusing the existing event pipeline.

4. Resources/en-US/Resources.resw: Added localized string Nav_OpenSettingsFolder.Text with value "Open settings folder".

PR Checklist

• Closes Add functionality to settings Open JSON file entry to open the settings.json parent folder in Explorer #12382
• Tests added/passed — This is a small UI addition that reuses existing tested backend code. No new tests needed.
• Documentation updated — N/A
• Schema updated — N/A

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