Add fallback handling for missing icon files

Add graceful fallback behavior when icon image files (refresh.png, settings.png, MSMD32.png) are not found. The application now uses Unicode symbols (⟳, ⚙) as button text alternatives, preventing crashes when running without bundled assets.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Settings.py

@@ -25,7 +25,9 @@ class Settings(QWidget):
         self.__UserAbort = True
         
         #-----Widget Settings-----
-        self.setWindowIcon(QIcon('MSMD32.png'))
+        import os
+        if os.path.exists('MSMD32.png'):
+            self.setWindowIcon(QIcon('MSMD32.png'))
         self.setWindowTitle('MSMD Settings')
         
         #Remove Maximize and Minimize buttons