Clean repository and update .gitignore

- Remove build artifacts from git tracking (build/, dist/, __pycache__/, *.spec)
- Updated .gitignore to properly exclude generated files
- Added old_code/ documentation folder
- Updated sample_data.txt to show new 5-field format
- Exclude user-specific conf/app.conf from tracking

.gitignore

@@ -1,12 +1,41 @@
-label/
+# Build artifacts
 build/
-dist/
-logs/
-pdf_backup/
-venv/
+
+*.spec
+
+# Python cache
 __pycache__/
 *.pyc
 *.pyo
-*.spec
+*.pyd
+.Python
+
+# Virtual environments
+venv/
+env/
+ENV/
+
+# Application data folders
+label/
+logs/
+pdf_backup/
+
+# User-specific configuration
+conf/app.conf
+
+# IDE / Editor
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS files
+.DS_Store
+Thumbs.db
+desktop.ini
+
+# Python packaging
 *.egg-info/
 .eggs/
+*.egg