Rename app to SIAB Scale and update test suite

lib/screens/devices_screen.dart

@@ -82,7 +82,7 @@ class _DevicesScreenState extends State<DevicesScreen> {
       builder: (ctx) => AlertDialog(
         title: const Text('Unregister device'),
         content: Text(
-          'Remove \"${device.label}\" (${device.uuid}) from registered devices?',
+          'Remove "${device.label}" (${device.uuid}) from registered devices?',
         ),
         actions: [
           TextButton(
@@ -117,7 +117,7 @@ class _DevicesScreenState extends State<DevicesScreen> {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: const Text('TIMBANGAN SIAB'),
+        title: const Text('SIAB SCALE'),
         actions: [
           IconButton(
             onPressed: _loading ? null : _loadSaved,
@@ -148,7 +148,7 @@ class _DevicesScreenState extends State<DevicesScreen> {
               if (_scanResults.isEmpty && !ble.isScanning)
                 const Card(child: Padding(
                   padding: EdgeInsets.all(16),
-                  child: Text('Tap \"Scan Timbangan\" lihat melihat timbangan di sekitar.'),
+                  child: Text('Tap "Scan Timbangan" lihat melihat timbangan di sekitar.'),
                 ))
               else
                 ..._scanResults.map((r) {
@@ -300,7 +300,7 @@ class _ListRow extends StatelessWidget {
               '$label:',
               style: TextStyle(
                 fontWeight: FontWeight.w600,
-                color: Theme.of(context).colorScheme.onSurface.withOpacity(0.8),
+                color: Theme.of(context).colorScheme.onSurface.withValues(alpha: 0.8),
                 fontSize: 13,
               ),
             ),

lib/screens/home_screen.dart

@@ -25,7 +25,7 @@ class _HomeScreenState extends State<HomeScreen> {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: const Text('Timbangan Bluetooh'),
+        title: const Text('SIAB Scale'),
         backgroundColor: Theme.of(context).colorScheme.inversePrimary,
         actions: [
           Consumer<BLEService>(

lib/screens/timbang_screen.dart

@@ -58,8 +58,8 @@ class TimbangScreen extends StatelessWidget {
                           builder: (context, snapshot) {
                             final label = snapshot.data?.trim() ?? '';
                             final title = isConnected && label.isNotEmpty
-                                ? 'TIMBANGAN $label SIAB'
-                                : 'TIMBANGAN SIAB';
+                                ? 'SIAB SCALE - $label'
+                                : 'SIAB SCALE';
 
                             return _HeaderSection(
                               title: title,