feat(desktop): add BrowserAddressBar component

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

desktop/src/components/browser/BrowserAddressBar.test.tsx

@@ -0,0 +1,37 @@
+import { fireEvent, render, screen } from '@testing-library/react'
+import { describe, expect, it, vi } from 'vitest'
+import '@testing-library/jest-dom'
+import { BrowserAddressBar } from './BrowserAddressBar'
+
+const baseProps = {
+  url: 'http://localhost:5173/', canGoBack: false, canGoForward: false,
+  onNavigate: vi.fn(), onBack: vi.fn(), onForward: vi.fn(), onReload: vi.fn(),
+}
+
+describe('BrowserAddressBar', () => {
+  it('shows the current url in the input', () => {
+    render(<BrowserAddressBar {...baseProps} />)
+    expect(screen.getByRole('textbox')).toHaveValue('http://localhost:5173/')
+  })
+
+  it('submits the edited url via onNavigate', () => {
+    const onNavigate = vi.fn()
+    render(<BrowserAddressBar {...baseProps} onNavigate={onNavigate} />)
+    const input = screen.getByRole('textbox')
+    fireEvent.change(input, { target: { value: 'http://localhost:3000/x' } })
+    fireEvent.submit(input.closest('form')!)
+    expect(onNavigate).toHaveBeenCalledWith('http://localhost:3000/x')
+  })
+
+  it('disables back when cannot go back', () => {
+    render(<BrowserAddressBar {...baseProps} canGoBack={false} />)
+    expect(screen.getByLabelText('后退')).toBeDisabled()
+  })
+
+  it('enables back and fires onBack when canGoBack', () => {
+    const onBack = vi.fn()
+    render(<BrowserAddressBar {...baseProps} canGoBack onBack={onBack} />)
+    fireEvent.click(screen.getByLabelText('后退'))
+    expect(onBack).toHaveBeenCalled()
+  })
+})

desktop/src/components/browser/BrowserAddressBar.tsx

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+import { useEffect, useState } from 'react'
+import { ArrowLeft, ArrowRight, RotateCw } from 'lucide-react'
+
+type Props = {
+  url: string
+  canGoBack: boolean
+  canGoForward: boolean
+  onNavigate: (url: string) => void
+  onBack: () => void
+  onForward: () => void
+  onReload: () => void
+}
+
+export function BrowserAddressBar({ url, canGoBack, canGoForward, onNavigate, onBack, onForward, onReload }: Props) {
+  const [draft, setDraft] = useState(url)
+  useEffect(() => { setDraft(url) }, [url])
+
+  return (
+    <div className="flex items-center gap-1 px-2 py-1.5 border-b border-[var(--color-border)]">
+      <button aria-label="后退" disabled={!canGoBack} onClick={onBack} className="p-1 disabled:opacity-40"><ArrowLeft size={16} /></button>
+      <button aria-label="前进" disabled={!canGoForward} onClick={onForward} className="p-1 disabled:opacity-40"><ArrowRight size={16} /></button>
+      <button aria-label="刷新" onClick={onReload} className="p-1"><RotateCw size={16} /></button>
+      <form className="flex-1" onSubmit={(e) => { e.preventDefault(); onNavigate(draft.trim()) }}>
+        <input
+          className="w-full rounded-md bg-[var(--color-surface)] px-2 py-1 text-xs text-[var(--color-text-primary)]"
+          value={draft}
+          onChange={(e) => setDraft(e.target.value)}
+          spellCheck={false}
+        />
+      </form>
+    </div>
+  )
+}