feat(ui): add remove all missing files functionality (#4108)

* Add remove all missing files feature

* test: update mediafile_repository tests for missing files deletion

Signed-off-by: Deluan <deluan@navidrome.org>

---------

Signed-off-by: Deluan <deluan@navidrome.org>

ui/src/missing/DeleteMissingFilesButton.test.jsx

@@ -0,0 +1,42 @@
+import React from 'react'
+import { render } from '@testing-library/react'
+import { describe, it, expect, beforeEach, vi } from 'vitest'
+import DeleteMissingFilesButton from './DeleteMissingFilesButton.jsx'
+import * as RA from 'react-admin'
+
+vi.mock('react-admin', async () => {
+  const actual = await vi.importActual('react-admin')
+  return {
+    ...actual,
+    Button: ({ children, onClick, label }) => (
+      <button onClick={onClick}>{label || children}</button>
+    ),
+    Confirm: ({ isOpen }) => (isOpen ? <div data-testid="confirm" /> : null),
+    useNotify: vi.fn(),
+    useDeleteMany: vi.fn(() => [vi.fn(), { loading: false }]),
+    useRefresh: vi.fn(),
+    useUnselectAll: vi.fn(),
+  }
+})
+
+describe('DeleteMissingFilesButton', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  it('uses remove_all label when deleteAll is true', () => {
+    const { getByRole } = render(<DeleteMissingFilesButton deleteAll />)
+    expect(getByRole('button').textContent).toBe(
+      'resources.missing.actions.remove_all',
+    )
+  })
+
+  it('calls useDeleteMany with empty ids when deleteAll is true', () => {
+    render(<DeleteMissingFilesButton deleteAll />)
+    expect(RA.useDeleteMany).toHaveBeenCalledWith(
+      'missing',
+      [],
+      expect.any(Object),
+    )
+  })
+})