## Why

The current frontend components lack a consistent and modern design. Manually styling components is time-consuming and leads to inconsistencies. Adopting a component library like `shadcn/ui` will provide a professional look and feel, and speed up development.

## What Changes

- Integrate the `shadcn/ui` library into the frontend application.
- Replace existing custom components (like `Dropdown` and `FilterBox`) with their `shadcn/ui` equivalents.
- All new frontend components will be built using `shadcn/ui`.

## Capabilities

### New Capabilities
- `shadcn-integration`: Integrate the `shadcn/ui` library and replace existing components.

### Modified Capabilities
- None

## Impact

- This will be a significant change to the frontend codebase.
- All existing components will be refactored or replaced.
- This will introduce a new dependency on the `shadcn/ui` library.