Detect XWayland dialogs via WM_TRANSIENT_FOR, not just native xdg_toplevel parent

Window::is_dialog (close-button-only titlebar, no traffic lights) was
only ever set from a native xdg_toplevel's own parent() - redraw_
decoration_buffer's is_dialog computation called dw.toplevel(), which
is always None for an XWayland-backed DWindow (X11Surface's own
accessor is x11_surface(), a different method), so the .unwrap_or(false)
fallback made every XWayland dialog - a GTK "Save As", an app's own
"About" box, anything setting the ICCCM transient-for hint - always
draw with the full three-button titlebar and traffic-light colours,
even though the feature this was built for explicitly wanted the
opposite. Documented as a known gap at the time; now closed.

redraw_decoration_buffer now also checks X11Surface::is_transient_for()
for an XWayland window. property_notify gained a WmWindowProperty::
TransientFor arm that re-runs redraw_decoration_buffer, for a client
that sets the hint slightly after its own initial map - the same
"read fresh every call" pattern the existing xdg_toplevel::parent()
check already relied on, extended to catch a late X11 property the way
the Wayland equivalent (set_parent, any time) already was.

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