Three layered improvements on the 2D registry layer:
- Z-order buckets so the SVG document order reflects intent: zones (0)
paint first, slabs/ceilings (1) next, every other kind (walls / items /
shelves / columns / stairs / …) on top. Stable sort preserves DFS order
within a bucket.
- Base / overlay split: each entry's `FloorplanGeometry` tree is walked
through `splitFloorplanOverlay`, partitioning into a base group
(polygons, paths, fills, hatches) and an overlay group (interactive
handles + labels — `text` / `endpoint-handle` / `midpoint-handle` /
`edge-handle` / `move-handle` / `dimension` / `dimension-label`). Base
renders rank-sorted; overlays paint after every base entry so polygon-
editor chrome on a selected slab and zone name labels stay legible
above the structural fills sitting on top of them.
- Click guard on the outer layer `<g>`. The base/overlay split means
pointer-down lands on base and pointer-up lands on overlay (selection
mounts the overlay on top mid-gesture). The browser then dispatches
`click` to the lowest common ancestor, ABOVE the entry's
`onClick={handleClickStop}`. Without a higher-level stop, the click
reached the SVG's `handleBackgroundClick` → `clear-elements` and the
selection set on pointer-down vanished a frame later. Scoped to
`onClick` only so pointer / hover / drag still propagate inside the
registry tree.
Also extends the `text` FloorplanGeometry with stroke / strokeWidth /
paintOrder / fontFamily so kinds can match the legacy "white fill +
colored outline" label look (used by the new zone name label).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
