first commit

tests/integration/themeToggle.test.tsx

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+import { render, screen } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { describe, expect, it } from 'vitest'
+import { ThemeToggle } from '../../src/components/ThemeToggle'
+import { ThemeProvider } from '../../src/design/ThemeProvider'
+
+describe('ThemeToggle', () => {
+  it('switches between the independent blue and light schemes', async () => {
+    localStorage.clear()
+    render(<ThemeProvider><ThemeToggle /></ThemeProvider>)
+    await userEvent.click(screen.getByRole('button', { name: '切换前端 UI 方案' }))
+    expect(document.documentElement.dataset.theme).toBe('light')
+    expect(localStorage.getItem('safety-theme')).toBe('light')
+  })
+})