## Why

The current dropdown component has an outdated and inconsistent style. Adopting a modern, standardized design from a proven design system like shadcn/ui will improve user experience and visual consistency.

## What Changes

- The existing dropdown component will be restyled to match the appearance and behavior of the shadcn/ui Dropdown Menu.
- This may involve replacing the underlying implementation or applying new CSS styles.

## Capabilities

### New Capabilities
- `shadcn-dropdown-style`: Implement a dropdown component styled according to the shadcn/ui design system.

### Modified Capabilities
- None

## Impact

- This will affect all parts of the frontend that use the dropdown component.
- The `frontend/src/components/FilterBox.js` is a likely candidate to be affected.