Restore dockable navigation pane with adaptive/docked/overlay modes

[Gabriel Dufresne (GabrielDuf)]

This pull request introduces a new user-selectable navigation menu layout mode ("Navigation menu mode") to the application, allowing users to choose between Automatic, Docked open, or Sliding overlay navigation styles. The implementation updates the sidebar's responsive logic, adds the new setting to the interface and settings engine, and refactors the layout bindings and logic for greater clarity and flexibility.

Navigation menu mode feature:

• Added a new "Navigation menu mode" setting (NavMenuMode) with options: Automatic, Docked open, and Sliding overlay, including UI text and settings key definitions.
• Updated the settings page (Interface_P) to include a combobox for selecting the navigation menu mode, and made the change apply live without restart.

Sidebar and layout logic refactor:

• Refactored SidebarViewModel to support the new navigation modes, including logic for docked, rail, and overlay layouts, and responsive behavior based on window width. Added new properties and methods to manage these states.
• Updated MainWindow.axaml to bind the visibility of navigation elements (NavRail, NavDock, and overlay) to the new sidebar properties, ensuring correct layout for each mode and window size.

Code cleanup and minor improvements:

• Removed obsolete badge visibility property change notifications in SidebarViewModel, as layout changes are now handled by the new logic.
• Updated sidebar pane open/close logic to persist user preference only in docked mode, and ensured the overlay closes when a new page is selected unless docked.
• Refactored window width observation and sidebar updates to drive layout changes responsively, and added a method to refresh navigation mode live from settings.