feat v1.32.0: polyline split, tool cursors, Esc walk-back in merge/split

- splitRoomPath in logic.ts: wall-to-wall polyline cut with interior
  vertices; validates wall crossings, self-intersection, degenerate
  parts; splitRoom delegates (2-point path); +3 unit tests (93 total)
- split UI: interior clicks add snapped intermediate points, live
  polyline + vertices + preview; new/updated toasts
- cursors: pointer for merge/delroom and split room-pick stage,
  crosshair while cutting (stage tool-* classes)
- Esc: split — drop last point, then room pick, then back to draw;
  merge — clear selection, then back to draw
- smoke_split_polyline.mjs (14 checks); TESTING/CHANGELOG same-commit

demo/smoke_split_polyline.mjs

@@ -0,0 +1,55 @@
+import { launch } from './serve.mjs';
+const { page, browser } = await launch();
+const res = await page.evaluate(async () => {
+  const out = {};
+  const c = window.__card;
+  const sr = () => c.shadowRoot || c.renderRoot;
+  const stage = () => sr().querySelector('.stage');
+  c._setMode('plan'); await c.updateComplete;
+  // 1) курсоры: split до выбора комнаты — pointer, после — crosshair; merge — pointer
+  c._tool = 'split'; c.requestUpdate(); await c.updateComplete;
+  out.splitPickCursor = getComputedStyle(stage()).cursor === 'pointer';
+  const rooms = c._spaceModel().rooms;
+  const room = rooms.find((r) => r.id === 'r1');
+  const center = c._roomCenter(room);
+  c._splitClick(center); await c.updateComplete;
+  out.roomPicked = c._splitSel?.roomId === 'r1';
+  out.splitCutCursor = getComputedStyle(stage()).cursor === 'crosshair';
+  c._tool = 'merge'; c._splitSel = null; c.requestUpdate(); await c.updateComplete;
+  out.mergeCursor = getComputedStyle(stage()).cursor === 'pointer';
+  // 2) полилинейный разрез: r1 = прямоугольник? возьмём его poly и построим Г-разрез
+  c._tool = 'split'; await c.updateComplete;
+  c._splitClick(center);
+  const poly = (() => { const r = rooms.find((x) => x.id === 'r1');
+    return r.poly ? r.poly : [[r.x, r.y], [r.x + r.w, r.y], [r.x + r.w, r.y + r.h], [r.x, r.y + r.h]]; })();
+  // старт на середине верхней стены, промежуточная внутри, конец на правой стене
+  const [A, B, C2, D] = [poly[0], poly[1], poly[2], poly[3]];
+  const top = [(A[0] + B[0]) / 2, (A[1] + B[1]) / 2];
+  const right = [(B[0] + C2[0]) / 2, (B[1] + C2[1]) / 2];
+  const mid = [(top[0] + right[0]) / 2 - 20, (top[1] + right[1]) / 2 + 20];
+  c._splitClick(top);
+  out.firstOnWall = c._splitSel?.pts.length === 1;
+  c._splitClick(mid);
+  out.midAdded = c._splitSel?.pts.length === 2;
+  c._splitClick(right);
+  out.dialogAfterCut = !!c._pendingSplit && c._roomDialog;
+  out.partsPolys = c._pendingSplit ? [c._pendingSplit.mainPoly.length, c._pendingSplit.newPoly.length] : null;
+  // отмена — комната целая
+  c._roomDialogCancel(); await c.updateComplete;
+  out.cancelKeepsRoom = !c._pendingSplit && rooms.length === c._spaceModel().rooms.length;
+  // 3) Esc: пошаговый выход
+  const esc = async () => { window.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape' })); await c.updateComplete; };
+  c._tool = 'split'; c._splitSel = null;
+  c._splitClick(center); c._splitClick(top); c._splitClick(mid); await c.updateComplete;
+  await esc(); out.escDropsPoint = c._splitSel?.pts.length === 1;
+  await esc(); out.escDropsFirst = c._splitSel?.pts.length === 0;
+  await esc(); out.escDropsRoom = c._splitSel === null && c._tool === 'split';
+  await esc(); out.escExitsTool = c._tool === 'draw';
+  // merge: выбор → Esc снимает, ещё Esc — выход
+  c._tool = 'merge'; c._mergeSel = 'r1'; await c.updateComplete;
+  await esc(); out.escClearsMerge = c._mergeSel === null && c._tool === 'merge';
+  await esc(); out.escExitsMerge = c._tool === 'draw';
+  return out;
+});
+console.log(JSON.stringify(res, null, 1));
+await browser.close();