docker-service-discovery/openspec/changes/refactor-dropdown-with-checkboxes/design.md

Context

The existing Dropdown component is a simple, single-select dropdown. The styling is not well-defined, leading to visual inconsistencies. The user wants to be able to select multiple items from the dropdown and have a more polished UI.

Goals / Non-Goals

Goals:

• Refactor the Dropdown component to support multi-selection with checkboxes.
• Fix the styling issues, including text size and adding a clear boundary to the dropdown.
• The refactored component should be reusable.

Non-Goals:

• This refactor will not introduce any new third-party libraries. We will use existing CSS and React capabilities.
• We will not be adding complex features like search or filtering within the dropdown itself.

Decisions

• State Management: The Dropdown component will manage its own open/closed state. The selected values will be managed by the parent component (FilterBox) to allow for greater flexibility.
• Styling: We will use CSS modules to ensure the styles are scoped to the component. We will define clear classes for the container, header, list, items, and checkboxes.
• Component API: The Dropdown component will accept an options array, a selectedValues array, and an onSelect function as props.

Risks / Trade-offs

• [Risk] A complete refactor could introduce new bugs. → Mitigation: We will build the new component in isolation first, and then integrate it into FilterBox. The user has also requested to skip tests for now, which increases the risk. We will rely on manual testing.