App icon for 4.0.0-beta is not the correct size

**Describe the bug | 问题描述**
The new Mos app icon is smaller than other app icons.

**Expected behavior | 期望结果**
App icon to have correct dimensions.

**Screenshots | 相关截图**
<img width="1170" height="360" alt="Image" src="https://github.com/user-attachments/assets/02d5073e-9f72-4d58-8180-d818a5e2c855" />

**System Info | 系统信息:**
 - OS: macOS 15.7.3
 - Version 4.0.0-beta-20251201