Revert "修复审批请求在聊天中无提示且无法响应 (#467)" (#553)

This reverts commit 56c7b59eaf.

tests/client/message-item-highlight.test.ts

@@ -48,23 +48,6 @@ describe('MessageItem tool details', () => {
     })
   })
 
-  it('renders system approval prompt content in the chat bubble', () => {
-    const wrapper = mount(MessageItem, {
-      props: {
-        message: {
-          id: 'approval-request',
-          role: 'system',
-          content: 'Approval required\n\nCommand:\n```\nbash -lc \'printf ok\'\n```\n\nReply with /approve to approve once.',
-          timestamp: Date.now(),
-        } satisfies Message,
-      },
-    })
-
-    expect(wrapper.text()).toContain('Approval required')
-    expect(wrapper.text()).toContain('Reply with /approve')
-    expect(wrapper.find('.message-bubble.system').exists()).toBe(true)
-  })
-
   it('renders highlighted code blocks for tool arguments and tool results', async () => {
     const wrapper = mount(MessageItem, {
       props: {