Cursor loses focus when switching input language on GNOME

### Description

When using Huly in Firefox (PWA or in a tab) on GNOME (Manjaro Linux), the text input cursor loses focus if I switch the input language with **Super+Space** (the default GNOME shortcut).

After switching language, I have to click back into the input field with the mouse to continue typing. This does not happen in other apps or websites, only in Huly.

### Steps to Reproduce

1. Open Huly in Firefox (latest version) on GNOME.
2. Focus any input field (e.g. task title, description, comment).
3. Start typing.
4. Press **Super+Space** to switch the input language (e.g. English → Persian).
5. Try typing again.

### Expected Behavior

The text cursor should stay active in the input field after switching input language, so I can continue typing without clicking.

### Actual Behavior

The cursor/focus is lost, and I need to click into the input field again to continue typing.

### Environment

- **OS:** Manjaro Linux (GNOME)
- **Browser:** Firefox 143
- **App version:** Huly web app (0.7.204, self-hosted)
- **Keyboard shortcut:** Super+Space (default GNOME input source switcher)

### Notes

This seems related to how the app handles input method focus on GNOME. Other web apps keep focus after switching input language.