Display-Modes: 3D-Template + Auto-Assign + Material/Raytracing-Slots

- Neues Template rhino/templates/dossier_3d.ini fuer perspektivische Views
- Registry-Loop in oberleiste.py generalisiert (Plan + 3D + Material +
  Raytracing) — Material/Raytracing skippen wenn kein Template vorhanden,
  um Cycles-Pipeline-Clone-Crash zu vermeiden
- Guid-Replace praezisiert: nur Section-Header-Guid, nie PipelineId
- Plan-spezifische ini-Patches auf target_name=="Dossier Plan" gegated
- Auto-Assign in startup.py: Parallel-Viewports -> Plan, Perspective -> 3D,
  einmal-pro-Doc via doc.Strings-Flag (User-Overrides bleiben)
- schnitte.activate_schnitt setzt Dossier Plan explizit (Hatches auch in
  Schnittperspektive sichtbar)
- GestaltungApp Section-Block neu strukturiert: PenBlock fuer 3D als 'Fill'
  innerhalb der Section, Solid-Fill-Toggle entfernt (war Duplikat)

rhino/startup.py

@@ -76,6 +76,71 @@ def _migrate_active_doc(*_):
         print("[STARTUP] Migration:", ex)
 
 
+_DOC_FLAG_VIEW_MODES = "dossier_view_modes_initialized"
+
+
+def _assign_default_display_modes(doc):
+    """Setzt einmalig pro Doc die Display-Modes auf die Dossier-Defaults:
+      - Parallel-Projektionen (Top/Front/Right/Schnitt-parallel) -> 'Dossier Plan'
+      - Perspektive (Perspective/Schnittperspektive)              -> 'Dossier 3D'
+    Persistiert einen Flag in doc.Strings → laeuft nur EINMAL pro Doc.
+    User-Overrides (manuelles Wechseln) bleiben damit erhalten.
+    """
+    if doc is None: return
+    try:
+        if doc.Strings.GetValue(_DOC_FLAG_VIEW_MODES) == "1":
+            return   # schon initialisiert
+    except Exception: pass
+
+    try:
+        from Rhino.Display import DisplayModeDescription
+    except Exception as ex:
+        print("[STARTUP] view-modes: DMD nicht verfuegbar:", ex); return
+
+    # Mode-Lookup per Name
+    mode_plan = mode_3d = None
+    try:
+        for dm in DisplayModeDescription.GetDisplayModes():
+            try:
+                n = dm.EnglishName
+                if n == "Dossier Plan": mode_plan = dm
+                elif n == "Dossier 3D": mode_3d   = dm
+            except Exception: pass
+    except Exception as ex:
+        print("[STARTUP] view-modes: Mode-List:", ex); return
+
+    if mode_plan is None and mode_3d is None:
+        print("[STARTUP] view-modes: keine Dossier-Modes registriert — skip")
+        return
+
+    n_set = 0
+    try:
+        for view in doc.Views:
+            try:
+                vp = view.ActiveViewport
+                if vp is None: continue
+                is_par = bool(vp.IsParallelProjection)
+                target = mode_plan if is_par else mode_3d
+                if target is None: continue
+                try:
+                    vp.DisplayMode = target
+                    n_set += 1
+                except Exception as ex:
+                    print("[STARTUP] view-modes set ({}): {}".format(
+                        vp.Name, ex))
+            except Exception: pass
+        try:
+            doc.Views.Redraw()
+        except Exception: pass
+    except Exception as ex:
+        print("[STARTUP] view-modes iterate:", ex)
+
+    try:
+        doc.Strings.SetString(_DOC_FLAG_VIEW_MODES, "1")
+    except Exception: pass
+    print("[STARTUP] view-modes: {} Viewport(s) gesetzt".format(n_set))
+
+
 def _on_doc_opened(sender, e):
     """Greift bei jedem geoeffneten Doc nach Rhino-Start. Migration ist
     idempotent (Flag in doc.Strings)."""
@@ -83,6 +148,7 @@ def _on_doc_opened(sender, e):
         doc = e.Document if hasattr(e, "Document") else Rhino.RhinoDoc.ActiveDoc
         import panel_base
         panel_base.migrate_to_dossier(doc)
+        _assign_default_display_modes(doc)
     except Exception as ex:
         print("[STARTUP] _on_doc_opened:", ex)
 
@@ -141,6 +207,11 @@ def _load_all(sender, e):
         text_editor._ensure_double_click_hook()
     except Exception as ex:
         print("[STARTUP] text_editor hook:", ex)
+    # Display-Modes auf Default fuer aktives Doc setzen (einmalig)
+    try:
+        _assign_default_display_modes(Rhino.RhinoDoc.ActiveDoc)
+    except Exception as ex:
+        print("[STARTUP] view-modes assign:", ex)
     # DOSSIERUI Window-Layout — Hinweis fuer manuelles Laden
     _hint_dossier_ui()
     # Startup-Timing-Summary 3 Sekunden spaeter (nachdem alle async Idle-