WindTerm not responding (screen freeze) during key pair login setup

# Environment

- OS Edition: **Windows 11 Pro**
- OS Version: **23H2**
- OS Build: **22631.3155**
- System: **64-bit operating system, x64-based processor**
- Processor: **11th Gen Intel Core i7-1165G7 @ 2.80GHz**
- RAM: **32 GB**

WindTerm: Version [2.6.0](https://github.com/kingToolbox/WindTerm/releases/tag/2.6.0)

# Steps to Reproduce

1. Open WindTerm
2. Create a new Session
3. Under SSH tab input
4. click Connect
5. Select user and tick the box to remember for next time
6. Select Public Key identification (instead of Password)
7. Select an Identity File
8. Input passphrase
9. Tick the box to remember this step
10. Click Continue

# Expected Result

WindTerm should connect to the host using the key pair.

# Actual Result

WindTerm hangs, windows turns pale, process is not responding.


No source file or test is named. First reproduce the SSH key-pair login flow on Windows 11 with WindTerm 2.6.0, focusing on the freeze after clicking Continue; done means the application remains responsive and connects to the host using the selected identity file.

Written by the indexing model from the issue text.