Added Draggable Functionality for Main Menu Positioning

[forumi0721]

This update adds a draggable feature to allow users to reposition the main menu.
The change was made to resolve issues where elements in fixed positions were obstructing visibility.

Changes Made:

• Implemented draggable functionality for the main menu
• Ensured the menu retains its position after movement

[polyzium]

My feedback on this:

• Once the menu is closed, releasing LMB when dragging makes the menu open, and when you drag it to the side, the close button is unreachable because it is out of bounds.
• Clicking on any part of the menu, including dropdowns, makes it drag (the dropdowns, however, stay). It would be better if you would add a separate "drag" handle on the side of the menu.
• When resizing the window, the menu may go out of bounds and therefore may be unreachable.
• Snapping functionality would be very nice to have considering how often you'd be moving this around.