Chore: Stop tracking files based on .gitignore update.

Untracked files matching the following rules:
- Rule "*.old": 1 file

.gitignore

@@ -5,7 +5,7 @@ build/
 _dist/
 _build/
 *.ini
-
+*.old
 # Python cache files
 __pycache__/
 *.py[cod]

gitutility/core/remote_actions.py

@@ -548,6 +548,7 @@ class RemoteActionHandler:
             # --- Analyze Result ---
             stdout_full: str = push_result.stdout if push_result.stdout else ""
             stderr_full: str = push_result.stderr if push_result.stderr else ""
+            stderr_lower: str = stderr_full.lower()
             combined_output_lower: str = (stdout_full + stderr_full).lower()
 
             if push_result.returncode == 0: