List items skipped because of an invalid name as failed

The client never uploads items whose names are not valid on OneDrive
("Skipping item - invalid name (Microsoft Naming Convention): ./a:b",
also for invalid whitespace, HTML ASCII codes, invalid UTF-16 and
control codes), and it does not count them as failed, so the sync
result is "success" while the item is silently missing online.

Such items are now listed as failed entries in the file operation list
(behind the "N failed" toggle) with a tooltip naming the reason and
asking to rename the item.

src/onedrive_gui/workers.py

@@ -715,6 +715,29 @@ class WorkerThread(QThread):
                     self.pending_error = error_text
                     self.pending_error_path = None
 
+            elif stdout.startswith("Skipping ") and " - invalid name (" in stdout:
+                # Examples:
+                #   Skipping item - invalid name (Microsoft Naming Convention): ./dir/bad:name.txt
+                #   Skipping item - invalid name (Contains an invalid whitespace character): ./file
+                # The client never uploads these items and does not count them as failed,
+                # so without this they would be silently missing online.
+                match = re.match(r"Skipping .+? - invalid name \((.+?)\): (.+)$", stdout)
+                if match:
+                    reason, file_path = match.group(1), match.group(2).strip()
+                    error_message = f"Not synced - the name is not valid on OneDrive ({reason}). Rename the item to sync it."
+                    self.file_errors[_path_key(file_path)] = error_message
+                    transfer_progress_new = {
+                        "file_operation": "Uploading",
+                        "file_path": file_path,
+                        "progress": "0",
+                        "transfer_complete": False,
+                        "transfer_failed": True,
+                        "error_message": error_message,
+                        "timestamp": None,
+                    }
+                    logging.warning(f"[{self.profile_name}] {stdout}")
+                    self.update_progress_new.emit(transfer_progress_new, self.profile_name)
+
             elif stdout.startswith("Skipping uploading this"):
                 # Examples:
                 #   Skipping uploading this new file due to 'case-insensitive match': ./file