feat: 优化警告提示和调解流程 UI，新增 AI 背景和图片资源

chengmw

2026-04-02 6b14010e1765842acc437ab130e5815bc623788d

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// jest-dom adds custom jest matchers for asserting on DOM nodes.
// allows you to do things like:
// expect(element).toHaveTextContent(/react/i)
// learn more: https://github.com/testing-library/jest-dom
import '@testing-library/jest-dom';