gtk_widget_get_scale_factor: assertion 'GTK_IS_WIDGET (widget)' failed

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### Windows Version

Microsoft Windows [版本 10.0.26200.7171]

### WSL Version

WSL 版本: 2.6.1.0 内核版本: 6.6.87.2-1 WSLg 版本: 1.0.66 MSRDC 版本: 1.2.6353 Direct3D 版本: 1.611.1-81528511 DXCore 版本: 10.0.26100.1-240331-1435.ge-release Windows: 10.0.26200.7171

### Are you using WSL 1 or WSL 2?

- [x] WSL 2
- [ ] WSL 1

### Kernel Version

Linux version 6.6.87.2-microsoft-standard-WSL2 (root@439a258ad544) (gcc (GCC) 11.2.0, GNU ld (GNU Binutils) 2.37) #1 SMP PREEMPT_DYNAMIC Thu Jun 5 18:30:46 UTC 2025

### Distro Version

22.04

### Other Software

### Repro Steps

cc-switch

(cc-switch:647): Gtk-CRITICAL **: 08:45:31.860: gtk_widget_get_scale_factor: assertion 'GTK_IS_WIDGET (widget)' failed

(cc-switch:647): Gtk-CRITICAL **: 08:45:31.860: gtk_widget_get_scale_factor: assertion 'GTK_IS_WIDGET (widget)' failed

### Expected Behavior

正常显示GUI

### Actual Behavior

cc-switch

(cc-switch:647): Gtk-CRITICAL **: 08:45:31.860: gtk_widget_get_scale_factor: assertion 'GTK_IS_WIDGET (widget)' failed

(cc-switch:647): Gtk-CRITICAL **: 08:45:31.860: gtk_widget_get_scale_factor: assertion 'GTK_IS_WIDGET (widget)' failed

### Diagnostic Logs

_No response_

The report only identifies WSL 2 on Ubuntu 22.04, WSLg, and a cc-switch GTK assertion; no repository file or test is named. Begin by reproducing cc-switch in this environment and collecting diagnostic logs, then trace the relevant WSLg startup path. Done means the assertion is explained and the GUI displays normally without the repeated critical messages.

Written by the indexing model from the issue text.