fix: use Qt enum for setWindowModality instead of raw integer

PySide6 requires the proper enum type QtCore.Qt.WindowModal, not the
raw integer 2. The integer form was accepted by PySide2/Qt5 but raises
TypeError in PySide6.

freecad/silo_commands.py

@@ -990,8 +990,10 @@ def _check_pull_conflicts(part_number, local_path, doc=None):
     conflicts = []
 
     # Check for unsaved changes in an open document
-    if doc is not None and doc.IsModified():
+    if doc is not None:
-        conflicts.append("Document has unsaved local changes.")
+        gui_doc = FreeCADGui.getDocument(doc.Name) if doc.Name else None
+        if gui_doc and gui_doc.Modified:
+            conflicts.append("Document has unsaved local changes.")
 
     # Check local revision vs server latest
     if doc is not None:
@@ -1213,7 +1215,7 @@ class Silo_Pull:
         progress = QtGui.QProgressDialog(
             f"Downloading {part_number} rev {rev_num}...", "Cancel", 0, 100
         )
-        progress.setWindowModality(2)  # Qt.WindowModal
+        progress.setWindowModality(QtCore.Qt.WindowModal)
         progress.setMinimumDuration(0)
         progress.setValue(0)