Dächer anwählbar + editierbar + löschbar

Platzierte Dächer sind jetzt vollwertige Auswahl-Elemente (analog Decke):
- 2D-Auswahl per Klick: unsichtbares Traufe-Pick-Polygon (roofId) +
  pickRoof (Punkt-in-Polygon, niedrigste Priorität) in PlanView.
- Auswahl-Kanal selectedRoofIds (selectionSlice), updateRoof (projectSlice),
  RoofInfo + roofSelection + deriveSelection-Dispatch (selectionInfo).
- Attribut-Panel „Dach": Form (Sattel/Walm/Pult/Mansarde/Zelt/Flach),
  Firstrichtung X/Y, Neigung(en), Überstand, Dachdicke — live editierbar über
  host.onSetRoofPatch; dazu abgeleitete Firsthöhe + Grundfläche (read-only).
- Löschen (Delete) + Abwählen bei Geschosswechsel/Marquee/anderer Auswahl.
+2 Tests (Roof-Selection). tsc + vitest 642 + vite build grün.

src/i18n/en.ts

@@ -284,6 +284,25 @@ export const en: Record<TranslationKey, string> = {
   "objinfo.kind.room": "Room",
   "objinfo.kind.extrudedSolid": "Extrusion",
   "objinfo.kind.column": "Column",
+  "objinfo.kind.roof": "Roof",
+  // ── Roof attributes (object info panel) ─────────────────────────────────
+  "objinfo.roof.section": "Roof",
+  "objinfo.roof.shape": "Roof shape",
+  "objinfo.roof.shape.flach": "Flat roof",
+  "objinfo.roof.shape.pult": "Mono-pitch roof",
+  "objinfo.roof.shape.sattel": "Gable roof",
+  "objinfo.roof.shape.walm": "Hip roof",
+  "objinfo.roof.shape.mansarde": "Mansard roof",
+  "objinfo.roof.shape.zelt": "Pyramid roof",
+  "objinfo.roof.ridgeAxis": "Ridge direction",
+  "objinfo.roof.ridgeAxis.x": "along X",
+  "objinfo.roof.ridgeAxis.y": "along Y",
+  "objinfo.roof.pitch": "Pitch (°)",
+  "objinfo.roof.pitchUpper": "Upper pitch (°)",
+  "objinfo.roof.overhang": "Overhang (m)",
+  "objinfo.roof.thickness": "Roof thickness (m)",
+  "objinfo.roof.ridgeHeight": "Ridge height",
+  "objinfo.roof.area": "Footprint area",
   // ── Column attributes (object info panel) ────────────────────────────────
   "objinfo.column.section": "Column",
   "objinfo.column.profile": "Profile",