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• Does your code follow the WordPress' coding standards?
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Changes proposed in this Pull Request:

This PR adds a new Custom Menus management page to the Memberlite admin area and enhances the theme import/export tools to support navigation menus.

New Features:

1. Custom Menus Admin Page (Memberlite > Custom Menus)

• Create new navigation menus from scratch or by duplicating an existing menu
• Duplicate any existing menu with all its menu items and hierarchy preserved
• Delete menus with confirmation dialog
• View all menus with their assigned locations and item counts
• Quick access to edit menus in the native WordPress menu editor

2. Menu Export Support

• Optionally include navigation menus when exporting theme settings
• Select which menus to export via checkbox interface
• Menu items are exported as custom links with relative URLs for portability across environments
• Preserves menu item labels, targets, descriptions, CSS classes, and hierarchy

3. Menu Import Support

• Import navigation menus from theme settings export files
• Relative URLs are automatically converted to absolute URLs using the destination site's URL
• Duplicate menu names are automatically numbered (e.g., "Main Menu (2)")
• Preserves all menu item properties and parent/child relationships

4. Admin UI Improvements

• Added "Custom Menus" tab to the Memberlite admin navigation
• Added "Manage with Memberlite" quick link on the Appearance > Menus page
• New CSS styles for scrollable checkbox lists and clickable rows
• Consistent delete button styling across admin pages

How to test the changes in this Pull Request:

Testing Custom Menus Page:

1. Navigate to Memberlite > Custom Menus in the WordPress admin.
2. Create a new menu by entering a name and clicking "Add Menu" - verify the menu is created.
3. Create another menu by selecting an existing menu from "Duplicate Items From" dropdown - verify menu items are copied with correct hierarchy.
4. Use the "Duplicate" button on an existing menu - verify a copy is created with "(Copy)" appended to the name.
5. Use the "Delete" button on a menu - verify confirmation dialog appears and menu is deleted.
6. Click "Edit" on a menu - verify it opens the WordPress menu editor.

Testing Menu Export:

1. Navigate to Memberlite > Tools.
2. In the Export Settings section, check "Include Navigation Menus" checkbox.
3. Select specific menus to export using the checkbox list.
4. Click "Download Export File" and verify the JSON file contains a menus array with menu data.
5. Verify menu item URLs that match the site URL are stored as relative paths (e.g., /about/ instead of https://example.com/about/).

Testing Menu Import:

1. Create an export file with menus from one site.
2. On another site (or after deleting the menus), navigate to Memberlite > Tools.
3. Upload the export file and import.
4. Verify menus are created with correct names (numbered if duplicates exist).
5. Verify menu items have correct labels, URLs (converted to absolute), and hierarchy.

Testing Cross-Environment Portability:

1. Export menus from a local development site.
2. Import on a staging or production site with a different URL.
3. Verify relative URLs are correctly converted to the new site's domain.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you successfully run tests with your changes locally?

Changelog entry

• FEATURE: Added new Custom Menus admin page under Memberlite > Custom Menus for creating, duplicating, and managing navigation menus.
• ENHANCEMENT: Theme import/export now supports navigation menus with portable relative URLs for easy migration between environments.