Extend the opening proximity guides to two more interactions:
- PLACEMENT: the door/window placement tools publish the same 3D guides
(sill/head, edge proximity, sill alignment, equal-spacing) while a NEW
opening is being dropped; window placement also snaps its sill to a
neighbour's sill/centre/top (Shift bypass) — so "two windows aligned" reads
during placement, not just move.
- RESIZE: a new `onDrag` hook on the linear-resize handle descriptor lets the
door/window width/height arrows publish live guides for the edge being
resized — proximity to neighbours as the width grows, and the live sill/head
as a window's height changes. The generic LinearArrow stays kind-agnostic;
only door/window declare the hook.
Refactor (Codex review follow-up): one `publishOpeningGuidesForWallEvent`
wrapper now backs all four wall-event publish sites (door/window move +
placement) over a shared `makeWallToWorld`; window placement's repeated
sill-snap is a single `resolvePlacementY` helper. Opening guides clear on
commit / leave / cancel / roof-hover / unmount (mirroring the alignment-guide
lifecycle) and on resize end.
Codex-reviewed — no blockers; lifecycle/leaks, coordinate frame, sill-snap
precedence, and resize disposal confirmed. Typecheck + biome + 23 core + 170
nodes tests pass.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
