Refactor UI code for better readability and consistency

- Improved formatting of ListTile icons and text styles in settings_screen.dart, telemetry_screen.dart, usb_screen.dart, gif_picker.dart, path_editor_sheet.dart, repeater_login_dialog.dart, and room_login_dialog.dart for better readability.
- Consolidated TextStyle definitions into single lines where applicable.
- Updated notification_service.dart to enhance readability of notification ID assignment.
- Simplified function signatures in routing_sheet.dart for clarity.
- Cleaned up test assertions in usb_flow_test.dart for conciseness.
- Removed unused translations in untranslated.json to streamline localization files.

test/screens/usb_flow_test.dart

@@ -160,15 +160,9 @@ void main() {
     final context = tester.element(find.byType(ScannerScreen));
     final l10n = AppLocalizations.of(context);
     if (PlatformInfo.supportsUsbSerial) {
-      expect(
-        find.byTooltip(l10n.connectionChoiceUsbLabel),
-        findsOneWidget,
-      );
+      expect(find.byTooltip(l10n.connectionChoiceUsbLabel), findsOneWidget);
     } else {
-      expect(
-        find.byTooltip(l10n.connectionChoiceUsbLabel),
-        findsNothing,
-      );
+      expect(find.byTooltip(l10n.connectionChoiceUsbLabel), findsNothing);
     }
 
     // ScannerScreen.dispose() schedules disconnect work that debounces notify.