FX.68 BimCraft lab: picking a wall with Draw off threw in the Properties panel (FX.22 read the drawing data that only exists while Draw is on)

Found 2026-11-05 by suggestions-followup-09 while fixing tools/ids/browser-bimcraft.mjs: with an IFC open and Draw off, picking a wall (for example from Problems) logged "TypeError: Cannot read properties of null (reading 'walls') at propsBlock" (model-ui.js). Cause: FX.22 (wall grips, Measure from) read S.data.walls, which is null unless Draw is on; propsBlock's own data (S.data when drawing, else a snapshot of the model) is the right source. The error was caught, so the panel just lacked the wall's Measure from and Length fields. Fix: one word in model-ui.js (all = data.walls). Lab only (FX.22 is 0.9 /lab); released 0.8.1 does not have the code.

Checked 2026-11-05: in the real page (lab BimCraft, house fixture, Draw off) a picked wall shows Measure from + Length and no console error; tools/ids/browser-bimcraft.mjs 30/0 (its 'no page errors' check), tools/bimcraft-test/wall-square-test.mjs 67/0, browser-wallsquare.mjs 28/0.