UI: Gruppe-A-Felder in Objekt-Info-Panel verdrahtet

- Treppe: Dropdown Referenz (Links/Mitte/Rechts) vor Laufrichtung.
- Fenster: Feld Fluegel (1-4) nach Bruestung.
- Tuer: Dropdowns Typ (Normal/Wandoeffnung) + Sturzlinien (Keine/Innen/Aussen/
  Beide) vor Anschlag.
- host.ts/selectionInfo.ts Durchreichung, App.tsx-Handler (kind-guard +
  updateOpening/updateStair), i18n de/en. Rueckwaertskompatibel.
  tsc sauber, vitest 292/292.

src/i18n/en.ts

@@ -301,6 +301,15 @@ export const en: Record<TranslationKey, string> = {
   "objinfo.opening.dir.out": "Out",
   "objinfo.opening.bottom": "Bottom (UK)",
   "objinfo.opening.top": "Top (OK)",
+  "objinfo.opening.wingCount": "Wings",
+  "objinfo.opening.doorType": "Type",
+  "objinfo.opening.doorType.normal": "Normal",
+  "objinfo.opening.doorType.wandoeffnung": "Wall opening",
+  "objinfo.opening.lintelLines": "Lintel lines",
+  "objinfo.opening.lintelLines.keine": "None",
+  "objinfo.opening.lintelLines.innen": "Inside",
+  "objinfo.opening.lintelLines.aussen": "Outside",
+  "objinfo.opening.lintelLines.beide": "Both",
   "objinfo.stair.section": "Stair",
   "objinfo.stair.shape": "Shape",
   "objinfo.stair.shape.straight": "Straight",
@@ -317,6 +326,10 @@ export const en: Record<TranslationKey, string> = {
   "objinfo.stair.refFloor": "Reference floor",
   "objinfo.stair.bottom": "Bottom (UK)",
   "objinfo.stair.top": "Top (OK)",
+  "objinfo.stair.referenz": "Reference",
+  "objinfo.stair.referenz.links": "Left",
+  "objinfo.stair.referenz.mitte": "Centre",
+  "objinfo.stair.referenz.rechts": "Right",
   // ── Room attributes (object info panel) ──────────────────────────────────
   "objinfo.room.section": "Room",
   "objinfo.room.name": "Name",