fix(viewer): keep offset door hit targets reachable from both sides

[Aymericr]

A door positioned away from its host wall can leave its invisible opening hit target behind the wall collision surface. Clicking from that side then selects the wall despite the visible opening.

Resolve the hit target from the host wall's zero-offset opening placement and express its horizontal correction in the door's rotated coordinates. This follows straight, curved and justified walls, including effective wall thickness. Visible frames, panels and the resolved floor height retain their authored placement. Unhosted and roof-hosted doors retain their existing behavior; reused targets reset after offset or parent changes. Frameless opening outlines follow the corrected opening position.

Validation: 119 focused tests / 1,456 assertions pass across eleven files, including actual wall collision rays from both sides, positive and negative offsets, flipped doors, rotated and curved walls, both wall justifications, compound rotations and mounted mesh reuse. The curved-wall follow-up reproduces eight failures before correction. Current-main legacy-load and zone-deletion controls also pass. Core/viewer TypeScript builds, formatting checks and both CI jobs pass. Independent architecture and regression reviews found no blocker.

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Note

Medium Risk
Changes invisible selection raycast geometry for wall-hosted doors with Z offset; behavior is heavily tested but affects core picking/interaction paths.

Overview
Fixes selection when a door is offset from its host wall: the invisible cutout raycast proxy now stays centered on the wall opening (zero Z offset) while frames and panels keep their authored offset.

resolveOpeningCutoutProxyDepth becomes resolveOpeningCutoutProxy, returning depth plus an optional placement center from getOpeningWallPlacement with Z cleared; syncDoorCutout applies that correction in the door mesh’s local space (including compound rotation). Unhosted doors, roof segments, and zero offset are unchanged; the proxy resets when offset or parent changes.

Adds door-cutout-proxy.test.ts with raycast, curved/justified wall, DoorSystem live-update, mesh reuse, and sliding-door visual bounds coverage.

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[pascal]

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