v1.50.4: one model builder for both cards (HP-1503-01)

The full card's _buildModel() was a hand-copied twin of spaceModels(), and
the twin missed the legacy-store fallbacks v1.50.3 gave the shared builder —
the same broken store rendered recovered in the static card and as
viewBox='0 0 0 0' with negative-width rects in the main one. The divergence
of the duplicates IS the bug, so the duplicate is gone: the full card calls
spaceModels() and only swaps the raw plan url back in (its signing flow must
not bake a signed url into a memoized model — 2026-07-27).

New smoke_legacy_geometry runs the audit's exact vector (zero viewport +
negative rect) through both models and both DOM trees and asserts parity:
full-canvas fallback, normalised rectangle, no negative SVG attributes.
Inventory: 140 / 51 / 43 / 65.

demo/smoke_legacy_geometry.mjs

@@ -0,0 +1,65 @@
+// HP-1503-01: один и тот же повреждённый store обязан рендериться одинаково в
+// ОБЕИХ карточках. Полная карточка строила модель рукописной копией
+// spaceModels и прошла мимо safeViewBox/normRect: статическая показывала
+// восстановленный план, полная — viewBox="0 0 0 0" и rect с отрицательной
+// шириной. Вектор аудита исполняется через обе модели и оба DOM-дерева.
+import { launch, checkAll, finish } from './serve.mjs';
+const { page, browser } = await launch({ width: 900, height: 900 }, 1);
+const res = await page.evaluate(async () => {
+  const out = {};
+  await customElements.whenDefined('houseplan-space-card');
+  const main = window.__card;
+
+  // ровно вектор из отчёта: нулевой viewport + отрицательный legacy-rect
+  const cfg = JSON.parse(JSON.stringify(main._serverCfg));
+  const f1 = cfg.spaces.find((s) => s.id === 'f1');
+  f1.plan_url = null; f1.plan_aspect = null;
+  f1.view_box = [0, 0, 0, 0];
+  f1.rooms = [{ id: 'r1', name: 'R', area: 'living_room', x: 0.6, y: 0.7, w: -0.2, h: -0.3 }];
+  f1.settings = { ...(f1.settings || {}), show_borders: true };
+  const hass = { ...main.hass, callWS: async (m) => {
+    if (m.type === 'houseplan/config/get') return { config: cfg, rev: 1 };
+    if (m.type === 'houseplan/layout/get') return { layout: {}, rev: 1 };
+    return { ok: true };
+  } };
+
+  main._serverCfg = cfg;
+  main._cfgEpoch++;
+  main._view = null;
+  main.requestUpdate(); await main.updateComplete;
+  await new Promise((r) => setTimeout(r, 150));
+
+  // модель полной карточки: fallback на весь холст + нормализованный rect
+  const m = main._spaceModel('f1');
+  out.fullVbFallsBack = JSON.stringify(m.vb) === JSON.stringify([0, 0, 1000, 1000]);
+  const r = m.rooms[0];
+  out.fullRectNormalised =
+    Math.round(r.x) === 400 && Math.round(r.y) === 400
+    && Math.round(r.w) === 200 && Math.round(r.h) === 300;
+
+  // DOM полной карточки: конечный положительный viewBox, никаких минусов в rect
+  const svg = (main.shadowRoot || main.renderRoot).querySelector('.stage svg');
+  const vbAttr = (svg?.getAttribute('viewBox') || '').split(/\s+/).map(Number);
+  out.fullDomViewBoxSane = vbAttr.length === 4 && vbAttr[2] > 0 && vbAttr[3] > 0;
+  const rect = (main.shadowRoot || main.renderRoot).querySelector('.stage svg rect.room, .stage svg .room rect, .stage svg rect[width]');
+  out.fullDomRectSane = !rect || (Number(rect.getAttribute('width')) >= 0 && Number(rect.getAttribute('height')) >= 0);
+
+  // статическая карточка того же store — паритет
+  const host = document.createElement('div');
+  document.body.appendChild(host);
+  const card = document.createElement('houseplan-space-card');
+  card.setConfig({ type: 'custom:houseplan-space-card', space: 'f1' });
+  card.hass = hass;
+  host.appendChild(card);
+  const t0 = Date.now();
+  while (!card.renderRoot?.querySelector('svg') && Date.now() - t0 < 6000) {
+    await new Promise((r2) => setTimeout(r2, 60));
+  }
+  await card.updateComplete;
+  const svb = (card.renderRoot.querySelector('svg')?.getAttribute('viewBox') || '').split(/\s+/).map(Number);
+  out.staticDomViewBoxSane = svb.length === 4 && svb[2] > 0 && svb[3] > 0;
+  out.parity = JSON.stringify(vbAttr.length === 4 && svb.length === 4
+    ? [vbAttr[2] > 0, vbAttr[3] > 0] : null) === JSON.stringify([svb[2] > 0, svb[3] > 0]);
+  return out;
+});
+await finish(browser, checkAll(res));