Loading Screen

Description
The loading screen currently disappears too quickly, making it difficult for users to perceive and understand that the application is transitioning between states.

Describe the solution you'd like
The loading screen should remain visible for at least 1-2 seconds, even if the loading process completes faster, to provide a smoother and more intuitive user experience.

Recommendation

Implement a minimum display duration of 1-2 seconds for the loading screen.

Issue 中没有指定文件或测试。首先在 TypeScript 应用程序中定位加载屏幕的实现，并确定在哪里将其关闭；通过确认加载较早完成时屏幕仍至少保持可见 1–2 秒来验证更改。

由索引模型根据 Issue 内容生成。