Implements the 10 protocol surfaces from Phase 4 of CONSOLE-TO-KDE-DESKTOP-PLAN.md:
- xdg-shell: xdg_wm_base, xdg_surface, xdg_toplevel, xdg_popup, xdg_positioner
- xdg-output (zxdg_output_manager_v1)
- xdg-decoration (zxdg_decoration_manager_v1)
- wp_viewporter for surface scaling
- zwp_linux_dmabuf_v1 for hardware buffer import
- wl_data_device, wl_data_source, wl_data_offer for clipboard/drag-and-drop
- wl_subcompositor, wl_subsurface for sub-surface composition
All protocols are required for Qt6 / KDE Plasma / KWin clients to run under
redbear-compositor. The compositor still serves the greeter only; KWin is
the canonical compositor for the user session.
Red Bear OS
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