#146 feat(registry): publish key-value-editor-utils as a registry:lib item

What and why

Step 2 of the native plan on #132. This adds @drift-ui/key-value-editor-utils, a registry:lib item with just lib/key-value-editor-utils.ts. The React Native key-value-editor in drift-ui/native will list it in registryDependencies and install the same parsing and duplicate logic the web version uses, so there's one copy of it.

The web key-value-editor item doesn't change. It still ships the lib file inline, so web installs behave exactly as before.

I've only added the one item the pilot needs. Others get their own item when a native port needs them.

Stacked on #142. The item name depends on the rename, so the first two commits here are #142's. Merge #142 first and this diff drops to the registry.json entry.

Refs #132

Checklist

• bun run typecheck, bun run lint and bun run test pass
• Tests cover the change, including keyboard interaction for UI components
• New components are added to registry.json, lib/catalog.ts, components/docs/preview-registry.tsx and lib/agent-docs/component-usage.ts, each at its alphabetical position
• Checked in light and dark mode