subsurface: use geometry-aware damage and recurse into nested trees (#13933)

* subsurface: use geometry-aware damage and recurse into nested trees

Replace per-surface damageSurface() calls in recheckDamageForSubsurfaces()
with box-based damage that tracks each subsurface's last known global
position and size. When geometry changes, both the old and new areas are
damaged to correctly clear stale pixels and paint the new location.

Additionally, recurse into child subsurfaces so that nested subsurface
trees are properly damage-checked, with a depth limit of 32 to guard
against cycles. Cached geometry is invalidated on map/unmap to avoid
stale comparisons across surface lifecycle transitions.

* clang-format

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