🐛[BUG] 安装界面无法通过键盘操作

## Please check each item in the following list carefully
- [x] I have searched and found no similar issues
- [x] Have searched the documentation and found no relevant content
- [x] I have tried to use the latest version, but the problem still exists
- [ ] The official version is used (no replacement and modification of the installation directory program files)

### 🐛 Description

在程序的安装 UI 无法只通过键盘操作，例如 Tab 切到安装按钮之类。

### 📷 Steps to Reproduce

1. 打开安装程序
2. 按 Tab 在安装界面的控件之间导航

### 📄 Log Information

### 🖼 Screenshots

### 🚑 Other Information
- Processor architecture: x64
- System version number:
- Download channels: GitHub
- Program version:
- Does it contain a standalone runtime:

Start by opening the installation UI and reproducing the issue with Tab navigation between controls. Trace the installer UI entry point and check which controls are unreachable or unusable from the keyboard; done means the installation flow can be completed using only the keyboard.

Written by the indexing model from the issue text.