OpenBangla Keyboard UI does not respect GNOME display scaling

[qomarhsn]

Environment:

• GNOME Version: 48 (Wayland)
• Scaling Factor: 125% (Fractional Scaling)
• Application Version: Unreleased 3.0.0 version, manually built from the develop branch

Problem:
When running the OpenBangla Keyboard, the Settings window and the topbar do not scale according to GNOME’s display scaling factor. UI elements appear smaller than expected, making them hard to read and interact with.

Expected Behavior:
The application should follow GNOME’s scaling factor so that all UI elements—including windows, menus, and the topbar—are appropriately sized.

Steps to Reproduce:

1. Build and run the OpenBangla Keyboard from the develop branch.
2. Enable GNOME fractional scaling at 125%.
3. Open the application.
4. Observe that the Settings window and topbar do not scale correctly.

Additional Information:
The app may be Qt-based, so it may not directly follow GNOME’s display scaling.

[codayon]

Yeah, it needs to be fixed asap. The UI is very much cooked or perhaps burned.

[codayon]

@mominul both issues (#430 and #406) are related to the PR (#400) that updates the UI.

On Debian 13, I have checked OBK v2 with older UI, which doesn't have any of these issues. I think the PR needs to be reviewed again to eradicate such issues.