Added feature to save settings to a json file and load them, to improve user experience.
✨ (genzai.py): Increase APP_DIMENSION to 520x520
✨ (genzai.py): Add test_connection method to DiscordRPC class for testing connection
✨ (genzai.py): Add Config section with Label, Combobox, and Button to App class
🐛 (genzai.py): Update all labels and entries to use CONFIG["APP_FONT"]
🐛 (genzai.py): Adjust grid row numbers due to addition of Config section
✨ (genzai.py): Add support for loading and saving configuration files
♻️ (genzai.py): Refactor UI elements to use font from CONFIG dictionary
🐛 (genzai.py): Fix grid row numbers to accommodate new UI elements
💡 (genzai.py): Add return statement in update method for better flow control
🐛 Update error handling to display specific error message when connection fails