- Save API URL and sound paths in a single load-modify-write cycle to
prevent race conditions that wiped previously saved config
- Strip trailing slashes from API URL to avoid double-slash 404 errors
- Make AppConfigService.saveConfig public for batch config writes
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Implement AppConfigService using path_provider to store settings in a local JSON file,\n ensuring configuration survives app updates/reinstalls.\n - Replace shared_preferences with AppConfigService in HomePage, SettingsPage,\n and RegistrationPage.\n - Replace shared_preferences with AppConfigService in HomePage, SettingsPage,\n and RegistrationPage.\n - Add HomePage.dart as the main navigation hub with feature cards (Registration,\n Boxing, Shelf Query) and dynamic connection status bar.\n - Remove Settings entry from RegistrationPage; Settings are only accessible from\n the Home page. Use 'flutter analyze' to verify the code.
