feat: implement AutocompleteArrayInput component

[Copilot]

Adds a multi-select autocomplete input component for array-valued fields, backed by ra-core's useInput and useChoicesContext hooks with client-side filtering via the q filter key.

Component

• packages/registry/src/form/autocomplete-array-input.tsx — Renders selected values as removable chips + a searchable combobox input. Filters availableChoices client-side via setFilters({ q: value }). Supports Backspace to remove last chip, Escape to close dropdown. Full ARIA semantics (combobox, listbox, aria-multiselectable, aria-expanded). Dark mode via Tailwind semantic tokens.

<AutocompleteArrayInput
  source="tag_ids"
  choices={[
    { id: 1, name: 'Sports' },
    { id: 2, name: 'Tech' },
  ]}
  label="Tags"
/>

Supporting files

• registry.json — registers autocomplete-array-input
• form.test.tsx — 8 new tests: label rendering, dropdown open/filter behavior, chip add/remove, placeholder
• form.stories.tsx — two stories: basic usage and pre-selected values
• apps/demo — synced via radish add autocomplete-array-input

[Copilot]

Pull request overview

Adds an AutocompleteArrayInput multi-select component to the registry (and synced demo) to support array-valued fields with chip rendering and an autocomplete dropdown, integrating with ra-core form/choices hooks.

Changes:

• Added AutocompleteArrayInput component (registry + synced demo copy) with chip UI and client-side filtering via useChoicesContext.
• Added Storybook stories and Vitest coverage for the new input.
• Registered the component in registry.json and updated the demo radish.lock.json.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/registry/src/form/autocomplete-array-input.tsx	Introduces the new multi-select autocomplete input implementation.
packages/registry/src/form/form.test.tsx	Adds tests covering render, dropdown behavior, filtering, and chip add/remove.
packages/registry/src/form/form.stories.tsx	Adds stories demonstrating basic and pre-selected usage.
packages/registry/registry.json	Registers the new component in the registry catalog.
apps/demo/src/components/form/autocomplete-array-input.tsx	Demo app synced copy of the new component.
apps/demo/radish.lock.json	Adds lock entry for the new component sync.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.