feat: list groups in registry

[kantord]

Notes about testing et cetera:

• You will need a custom registry, because the default registry will not have groups
• An example of a custom registry was included in the repo to simplify this
• This is behind a feature flag. use FeatureFlag.groups_in_registry.enable()
• This is NOT part of the groups feature and the first groups release

What's included:

• All required logic to display groups on the registry page. Installing them is not yet possible, hence the need for the feature flag

How it looks when the feature flag is enabled AND using a custom registry with groups included:

recording-2025-10-14_16-50-56.mp4

when the feature flag is disabled, the groups are simply hidden. (Screenshot showing the same custom registry)

[Copilot]

Pull Request Overview

This PR adds support for displaying groups in the registry page, implementing the foundational UI components for the groups feature. The functionality is controlled by a new feature flag GROUPS_IN_REGISTRY and includes comprehensive test coverage for the new functionality.

Key changes:

• Adds groups display functionality to the registry page with feature flag control
• Refactors registry card components to support both servers and groups through a unified interface
• Implements comprehensive test coverage for groups display and empty state handling

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
utils/feature-flags.ts	Adds new GROUPS_IN_REGISTRY feature flag key
renderer/src/routes/(registry)/registry.tsx	Updates registry component to fetch and display groups when feature flag is enabled
renderer/src/features/registry-servers/types.ts	Defines discriminated union type for registry items (servers and groups)
renderer/src/features/registry-servers/components/grid-cards-registry.tsx	Refactors grid component to handle both servers and groups with unified filtering
renderer/src/features/registry-servers/components/card-registry.tsx	Creates polymorphic card component that renders appropriate card type based on item type
renderer/src/features/registry-servers/components/card-registry-server.tsx	Refactors server card to use shared base component
renderer/src/features/registry-servers/components/card-registry-group.tsx	Implements new group card component with server count display
renderer/src/features/registry-servers/components/card-registry-base.tsx	Extracts shared card layout and behavior into reusable base component
renderer/src/common/types/utils.ts	Adds utility type for creating discriminated unions
renderer/src/routes/tests/registry.test.tsx	Adds comprehensive test coverage for groups functionality
renderer/src/common/mocks/customHandlers/fixtures/default_registry.ts	Updates mock data to include groups for testing
main/src/feature-flags.ts	Registers new feature flag in main process
examples/registries/registry-with-groups.json	Provides example registry configuration with groups