Symbol-Picker als Satellite-Fenster (statt Modal im Elemente-Panel)

UX-Verbesserung: Modal-Overlay im engen Elemente-Panel war unpraktisch.
Symbol-Picker oeffnet sich jetzt als eigenstaendiges Eto.Form-Fenster
(wie Library/Project-Settings).

Frontend:
- SymbolPicker bekommt embedded-Prop (Satellite-Mount vs Modal-Overlay)
- Neuer SymbolPickerApp Satellite-Wrapper (PANEL_PARAMS lesen + Bridge)
- main.jsx: 'symbol_picker' Mode-Routing
- ElementeApp: Symbol-Button ruft nur noch listLibrary() — Backend
  oeffnet das Fenster

Backend:
- _cmd_list_library oeffnet jetzt das Satellite-Window mit eigener
  Bridge (PICK -> CREATE_SYMBOL, CANCEL -> Close)
- PICK schliesst Fenster + triggert interactive GetPoint im Viewport

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

rhino/elemente.py

@@ -8092,18 +8092,50 @@ class ElementeBridge(panel_base.BaseBridge):
     # ------------------------------------------------------------------
 
     def _cmd_list_library(self, p):
-        """Liefert Library-Manifest ans Frontend (fuer den Symbol-Picker
-        im Elemente-Panel). Antwort: LIBRARY_LIST message."""
+        """Oeffnet den Symbol-Picker als Satellite-Window. Lieferung der
+        Library-Items + Handling von PICK (User waehlt Item → CREATE_SYMBOL
+        im aktiven Doc) und CANCEL (Fenster schliessen)."""
         try:
             import library
             manifest = library.load_manifest()
-            self.send("LIBRARY_LIST", {
-                "items": manifest.get("items", []),
-                "name":  manifest.get("name", "Dossier-Library"),
-            })
+            items = manifest.get("items", [])
         except Exception as ex:
             print("[ELEMENTE] list library:", ex)
-            self.send("LIBRARY_LIST", {"items": [], "name": ""})
+            items = []
+        outer_bridge = self
+        bridge_holder = {"form": None}
+        class _SymbolPickerBridge(panel_base.BaseBridge):
+            def __init__(self):
+                panel_base.BaseBridge.__init__(self, "symbol_picker")
+            def handle(self, data):
+                if not isinstance(data, dict): return
+                t = data.get("type", "")
+                pp = data.get("payload") or {}
+                if t == "READY": pass
+                elif t == "PICK":
+                    lib_id = (pp.get("id") or "").strip()
+                    if lib_id:
+                        # Fenster zu, dann interactive Place
+                        try:
+                            f = bridge_holder.get("form")
+                            if f is not None: f.Close()
+                        except Exception: pass
+                        try:
+                            outer_bridge._cmd_create_symbol({"id": lib_id})
+                        except Exception as ex:
+                            print("[SYMBOL-PICKER] CREATE_SYMBOL:", ex)
+                elif t == "CANCEL":
+                    try:
+                        f = bridge_holder.get("form")
+                        if f is not None: f.Close()
+                    except Exception: pass
+        b = _SymbolPickerBridge()
+        bridge_holder["form"] = panel_base.open_satellite_window(
+            "symbol_picker",
+            params={"items": items},
+            title="Symbol einfuegen",
+            size=(640, 560),
+            bridge=b)
 
     def _cmd_create_symbol(self, p):
         """Platziert ein Library-Item (symbol/object) im Doc. Interactive