feat(graphiql): add API version selector component

Adds dropdown component for selecting Admin API version.

- Add ApiVersionSelector component using Polaris Select
- Support for version list and change callbacks
- Include comprehensive tests (94 lines)

All component tests pass

Author: amcaplan

packages/graphiql-console/src/components/ApiVersionSelector/ApiVersionSelector.test.tsx

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+import {ApiVersionSelector} from './ApiVersionSelector.tsx'
+import React from 'react'
+import {render, screen, fireEvent} from '@testing-library/react'
+import {describe, test, expect, vi} from 'vitest'
+import {AppProvider} from '@shopify/polaris'
+
+// Helper to wrap components in AppProvider
+function renderWithProvider(element: React.ReactElement) {
+  return render(<AppProvider i18n={{}}>{element}</AppProvider>)
+}
+
+describe('<ApiVersionSelector />', () => {
+  const defaultVersions = ['2024-01', '2024-04', '2024-07', '2024-10', 'unstable']
+
+  test('renders Select component', () => {
+    const onChange = vi.fn()
+    renderWithProvider(<ApiVersionSelector versions={defaultVersions} value="2024-10" onChange={onChange} />)
+
+    // Select should be rendered with the accessibility label
+    const select = screen.getByLabelText('API version')
+    expect(select).toBeDefined()
+  })
+
+  test('Select has hidden label', () => {
+    const onChange = vi.fn()
+    renderWithProvider(<ApiVersionSelector versions={defaultVersions} value="2024-10" onChange={onChange} />)
+
+    // Label should exist but be visually hidden (Polaris labelHidden behavior)
+    const select = screen.getByLabelText('API version')
+    expect(select).toBeDefined()
+  })
+
+  test('renders all version options', () => {
+    const onChange = vi.fn()
+    renderWithProvider(<ApiVersionSelector versions={defaultVersions} value="2024-10" onChange={onChange} />)
+
+    const select = screen.getByLabelText('API version')
+
+    expect(select.options).toHaveLength(5)
+    expect(select.options[0].value).toBe('2024-01')
+    expect(select.options[1].value).toBe('2024-04')
+    expect(select.options[2].value).toBe('2024-07')
+    expect(select.options[3].value).toBe('2024-10')
+    expect(select.options[4].value).toBe('unstable')
+  })
+
+  test('displays currently selected value', () => {
+    const onChange = vi.fn()
+    renderWithProvider(<ApiVersionSelector versions={defaultVersions} value="2024-07" onChange={onChange} />)
+
+    const select = screen.getByLabelText('API version')
+    expect(select.value).toBe('2024-07')
+  })
+
+  test('calls onChange when selection changes', () => {
+    const onChange = vi.fn()
+    renderWithProvider(<ApiVersionSelector versions={defaultVersions} value="2024-10" onChange={onChange} />)
+
+    const select = screen.getByLabelText('API version')
+    fireEvent.change(select, {target: {value: '2024-04'}})
+
+    expect(onChange).toHaveBeenCalledTimes(1)
+    // Polaris Select may pass additional parameters, check first argument
+    expect(onChange.mock.calls[0][0]).toBe('2024-04')
+  })
+
+  test('handles empty versions array', () => {
+    const onChange = vi.fn()
+    renderWithProvider(<ApiVersionSelector versions={[]} value="" onChange={onChange} />)
+
+    const select = screen.getByLabelText('API version')
+    expect(select.options).toHaveLength(0)
+  })
+
+  test('handles single version', () => {
+    const onChange = vi.fn()
+    renderWithProvider(<ApiVersionSelector versions={['2024-10']} value="2024-10" onChange={onChange} />)
+
+    const select = screen.getByLabelText('API version')
+    expect(select.options).toHaveLength(1)
+    expect(select.options[0].value).toBe('2024-10')
+  })
+
+  test('handles custom version strings', () => {
+    const customVersions = ['v1', 'v2', 'v3-beta']
+    const onChange = vi.fn()
+    renderWithProvider(<ApiVersionSelector versions={customVersions} value="v2" onChange={onChange} />)
+
+    const select = screen.getByLabelText('API version')
+    expect(select.options[0].value).toBe('v1')
+    expect(select.options[1].value).toBe('v2')
+    expect(select.options[2].value).toBe('v3-beta')
+  })
+})

packages/graphiql-console/src/components/ApiVersionSelector/ApiVersionSelector.tsx

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+import React from 'react'
+import {Select} from '@shopify/polaris'
+
+interface ApiVersionSelectorProps {
+  // Available API versions
+  versions: string[]
+  // Currently selected version
+  value: string
+  // Callback when version changes
+  onChange: (version: string) => void
+}
+
+/**
+ * API version selector component
+ * Replaces vanilla JS event listener and manual DOM manipulation
+ */
+export function ApiVersionSelector({versions, value, onChange}: ApiVersionSelectorProps) {
+  return (
+    <Select
+      label="API version"
+      labelHidden
+      options={versions.map((version) => ({label: version, value: version}))}
+      value={value}
+      onChange={onChange}
+    />
+  )
+}

packages/graphiql-console/src/components/ApiVersionSelector/index.ts

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+export * from './ApiVersionSelector.tsx'