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/SessionFlows.acceptance.test.tsx

@@ -205,4 +205,18 @@ describe('Session workflow acceptance', () => {
     expect(sessionTarget).toHaveValue('admin@example.com:2200')
     expect(screen.getByLabelText('端口')).toHaveValue(2200)
   })
+
+  it('clears quick-connect credentials whenever the dialog is reopened', async () => {
+    const user = userEvent.setup()
+    const { rerender } = render(<QuickConnectDialog isOpen onClose={vi.fn()} />)
+
+    await user.type(screen.getByPlaceholderText('root@192.168.1.10:22'), 'root@example.com')
+    await user.type(screen.getByPlaceholderText('••••••••'), 'temporary-secret')
+
+    rerender(<QuickConnectDialog isOpen={false} onClose={vi.fn()} />)
+    rerender(<QuickConnectDialog isOpen onClose={vi.fn()} />)
+
+    expect(screen.getByPlaceholderText('root@192.168.1.10:22')).toHaveValue('')
+    expect(screen.getByPlaceholderText('••••••••')).toHaveValue('')
+  })
 })