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Neutral compositor-side mechanism the stage dock drives to minimize a window
(the "minimized" state/policy stays in ext-stage-dock). Adds to Toplevel:
geometry() -> wlr_box (size the preview + restore position), scene_tree() ->
wlr_scene_tree* (feed UiSubstrate::create_preview + the node hide/show toggles),
and hide()/show() — disable/enable the scene node so the client stops compositing
and frame callbacks WITHOUT unmapping (no on_toplevel_unmapped, no focus change),
idempotent. Verified against wlroots 0.20 that a disabled node quiesces frames.
A real in-process wayland client test (test_minimize.cpp) drives it on the
headless backend.
ext-xdg-shell suite green on build + build-asan. Edits confined to packages/ext-xdg-shell/.
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