[BUG] DropdownMenu options list uses solid background instead of glassmorphism

Description

The DropdownMenu component options list (ul element) is styled with bg-gray-800 (solid, opaque gray background) rather than glassmorphism, which breaks visual design consistency in a glassmorphic component library.

Steps to Reproduce

1. Go to the Dropdown Menu component details page.
2. Click the dropdown select button to open the menu options.
3. Notice the solid gray box layout.

Suggested Fix

Update the styling class on the ul element to use translucent backdrop blur classes.