feat: detach wall chain on Escape

Issue: #294
User-Visible: yes

src/houseplan-card.ts

@@ -2627,7 +2627,10 @@ class HouseplanCard extends LitElement {
     }
     if (this._tool === 'draw' && this._path.length) {
       e.preventDefault();
-      this._undoPoint();
+      // Escape releases the active wall chain without making it destructive:
+      // Ctrl/Cmd+Z remains the one-point undo path (#294).  Reuse the exact
+      // finish transaction used by a tool change, but keep `draw` selected.
+      this._finishWallChain();
       return;
     }
     if (this._physicalSel) {

src/i18n/en.json

@@ -158,7 +158,7 @@
   "confirm.delete_partition_openings_body": "This wall contains {count} opening(s). They will be deleted together.",
   "confirm.delete_partition_openings_item": "• {type}, {length}",
   "markup.delete": "Delete",
-  "markup.hint_points": "points: {n} · Shift — 45° steps · Esc/Ctrl+Z — undo a dot · closing an area offers a room",
+  "markup.hint_points": "points: {n} · Shift — 45° steps · Esc — finish chain · Ctrl+Z — undo a point · closing an area offers a room",
   "markup.hint_start": "click a grid dot to start a wall chain",
   "tip.lqi": "average zigbee signal:",
   "tip.area": "area: {value}",

src/i18n/ru.json

@@ -158,7 +158,7 @@
   "confirm.delete_partition_openings_body": "В стене есть проёмы: {count}. Они будут удалены вместе со стеной.",
   "confirm.delete_partition_openings_item": "• {type}, {length}",
   "markup.delete": "Удалить",
-  "markup.hint_points": "точек: {n} · Shift — шаг 45° · Esc/Ctrl+Z — убрать точку · при замыкании будет предложена комната",
+  "markup.hint_points": "точек: {n} · Shift — шаг 45° · Esc — завершить цепочку · Ctrl+Z — убрать точку · при замыкании будет предложена комната",
   "markup.hint_start": "кликните точку сетки, чтобы начать цепочку стен",
   "tip.lqi": "средний сигнал zigbee:",
   "tip.area": "площадь: {value}",