Rename app to SIAB Scale and update test suite

lib/widgets/connection_card.dart

@@ -57,7 +57,7 @@ class ConnectionCard extends StatelessWidget {
                     final success = await ble.autoConnect();
                     if (!success && context.mounted) {
                       ScaffoldMessenger.of(context).showSnackBar(
-                        SnackBar(
+                        const SnackBar(
                           content: Text(
                             'Failed to find ${SiabConfig.deviceName} device',
                           ),