feat: adapt to treeland-region-watch-unstable-v1 protocol - #1756

On November 2, 2026, GitHub will restrict `pull_request_target` on public repositories by default. To continue allowing the event trigger, configure an Actions policy. Learn more: https://gh.io/securely-using-pull_request_target#default-policy-for-pull_request_target

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/setup-go@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Include file: "qwayland-treeland-xwindow-control-unstable-v1.h" not found.

Include file: "qwayland-treeland-wallpaper-color-v1.h" not found.

Include file: "qwayland-treeland-dde-shell-v1.h" not found.

Include file: <QtWaylandClient/private/qwaylandsurface_p.h> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QtWaylandClient/private/qwaylandscreen_p.h> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: "wayland-treeland-region-watch-unstable-v1-client-protocol.h" not found.

Include file: "qwayland-treeland-region-watch-unstable-v1.h" not found.

Include file: "wayland-treeland-xwindow-control-unstable-v1-client-protocol.h" not found.

Include file: "wayland-treeland-dde-shell-v1-client-protocol.h" not found.

Include file: "qwayland-treeland-xwindow-control-unstable-v1.h" not found.