kscreen-console: fails because Qt platform plugin "xcb" cannot be loaded

Nixpkgs version

• Stable (25.05)

Describe the bug

$ kscreen-console
qt.qpa.xcb: could not connect to display
qt.qpa.plugin: From 6.5.0, xcb-cursor0 or libxcb-cursor0 is needed to load the Qt xcb platform plugin.
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: vnc, eglfs, linuxfb, offscreen, vkkhrdisplay, xcb, minimalegl, minimal, wayland, wayland-egl.

Aborted (core dumped)

Steps to reproduce

Run kscreen-console

Expected behaviour

I expect it to list the connected monitor configuration

Screenshots

No response

Relevant log output

Additional context

No response

System metadata

• system: "x86_64-linux"
• host os: Linux 6.16.0, NixOS, 25.05 (Warbler), 25.05.807449.ce01daebf848
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.28.4
• channels(root): "nixos-25.05"
• nixpkgs: /nix/store/q11ac0pfksspabwx3dshg71c9lhag2mj-nixos-25.05/nixos

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• I assert that this is a bug and not a support request.
• I assert that this is not a duplicate of an existing issue.
• I assert that I have read the NixOS Code of Conduct and agree to abide by it.

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Start by reproducing kscreen-console on the reported NixOS 25.05 system and inspect how its package dependency closure provides the Qt xcb platform requirements. Done means kscreen-console starts successfully and lists the connected monitor configuration without the xcb plugin error.