Add component reference docs with visual examples

[zrosenbauer]

Summary

Add a dedicated section to the docs site for UI components (re-exported from ink and @inkjs/ui, plus future custom components) with auto-generated reference documentation and visual examples of rendered output — similar to Storybook but lighter weight and tailored to terminal UI.

Components to Document

From ink

• Box, Text, Newline, Spacer, Static, Transform

From @inkjs/ui

• Select, MultiSelect, ConfirmInput, TextInput, PasswordInput, Spinner

Custom (Kidd)

• KiddProvider (with useConfig, useMeta, useStore hooks)
• screen

Tasks

• Add a "Components" section to the docs site
• Auto-generate API reference from TypeScript types/JSDoc where possible
• Create visual examples showing rendered terminal output (screenshots or captured frames)
• Design a pattern that scales to future custom components
• Ensure each component page includes: description, props table, usage example, and visual preview