feat: add terminal broadcast, context menu, and shell close

Complete multi-pane broadcast, standard terminal right-click actions, batch host selection with progress, and native ssh_close_shell so closing a pane tears down the remote shell.

Co-authored-by: Cursor <cursoragent@cursor.com>

test/components/TerminalContextMenu.test.tsx

@@ -0,0 +1,48 @@
+import { fireEvent, render, screen } from '@testing-library/react'
+import type { ComponentProps } from 'react'
+import { describe, expect, it, vi } from 'vitest'
+import TerminalContextMenu from '../../src/components/terminal/TerminalContextMenu'
+
+function renderMenu(overrides: Partial<ComponentProps<typeof TerminalContextMenu>> = {}) {
+  const props: ComponentProps<typeof TerminalContextMenu> = {
+    position: { x: 20, y: 20 },
+    hasSelection: false,
+    canSplit: true,
+    canClosePane: true,
+    canCloseTerminal: true,
+    closeLabel: '关闭当前分屏',
+    maximized: false,
+    onClose: vi.fn(),
+    onCopy: vi.fn(),
+    onPaste: vi.fn(),
+    onSelectAll: vi.fn(),
+    onClear: vi.fn(),
+    onSplitRight: vi.fn(),
+    onSplitDown: vi.fn(),
+    onToggleMaximize: vi.fn(),
+    onClosePane: vi.fn(),
+    ...overrides,
+  }
+  render(<TerminalContextMenu {...props} />)
+  return props
+}
+
+describe('TerminalContextMenu', () => {
+  it('provides standard clipboard and pane actions without browser debug entries', () => {
+    const props = renderMenu()
+    expect(screen.getByRole('menuitem', { name: '复制' })).toBeDisabled()
+    fireEvent.click(screen.getByRole('menuitem', { name: '粘贴' }))
+    expect(props.onPaste).toHaveBeenCalled()
+    expect(screen.queryByText('Reload')).not.toBeInTheDocument()
+    expect(screen.queryByText('Inspect Element')).not.toBeInTheDocument()
+  })
+
+  it('exposes right/down split and the context-aware close action', () => {
+    const props = renderMenu({ hasSelection: true, closeLabel: '关闭当前终端标签' })
+    fireEvent.click(screen.getByRole('menuitem', { name: '向右分屏' }))
+    expect(props.onSplitRight).toHaveBeenCalled()
+
+    renderMenu({ closeLabel: '关闭当前终端标签' })
+    expect(screen.getAllByRole('menuitem', { name: '关闭当前终端标签' })[0]).toBeEnabled()
+  })
+})