Fixed banner flash, added enable bluetooth button fixed theme to use app theme colors removed FAB overrides because material 3 does this for us, fixed missing translations.

lib/screens/scanner_screen.dart

@@ -80,7 +80,7 @@ class _ScannerScreenState extends State<ScannerScreen> {
             return Column(
               children: [
                 // Bluetooth off warning
-                if (_bluetoothState != BluetoothAdapterState.on)
+                if (_bluetoothState == BluetoothAdapterState.off)
                   _bluetoothOffWarning(context),
 
                 // Status bar
@@ -97,23 +97,18 @@ class _ScannerScreenState extends State<ScannerScreen> {
         builder: (context, connector, child) {
           final isScanning =
               connector.state == MeshCoreConnectionState.scanning;
-          final isBluetoothOn = _bluetoothState == BluetoothAdapterState.on;
+          final isBluetoothOff = _bluetoothState == BluetoothAdapterState.off;
 
           return FloatingActionButton.extended(
-            onPressed: isBluetoothOn
-                ? () {
+            onPressed: isBluetoothOff
+                ? null
+                : () {
                     if (isScanning) {
                       connector.stopScan();
                     } else {
                       connector.startScan();
                     }
-                  }
-                : null,
-            backgroundColor: isBluetoothOn ? null : Colors.grey,
-            foregroundColor: isBluetoothOn ? null : Colors.white,
-            mouseCursor: isBluetoothOn
-                ? SystemMouseCursors.click
-                : SystemMouseCursors.forbidden,
+                  },
             icon: isScanning
                 ? const SizedBox(
                     width: 20,
@@ -236,13 +231,14 @@ class _ScannerScreenState extends State<ScannerScreen> {
   }
 
   Widget _bluetoothOffWarning(BuildContext context) {
+    final errorColor = Theme.of(context).colorScheme.error;
     return Container(
       width: double.infinity,
       padding: const EdgeInsets.symmetric(vertical: 12, horizontal: 16),
-      color: Colors.red.withValues(alpha: 0.15),
+      color: errorColor.withValues(alpha: 0.15),
       child: Row(
         children: [
-          const Icon(Icons.bluetooth_disabled, size: 24, color: Colors.red),
+          Icon(Icons.bluetooth_disabled, size: 24, color: errorColor),
           const SizedBox(width: 12),
           Expanded(
             child: Column(
@@ -250,8 +246,8 @@ class _ScannerScreenState extends State<ScannerScreen> {
               children: [
                 Text(
                   context.l10n.scanner_bluetoothOff,
-                  style: const TextStyle(
-                    color: Colors.red,
+                  style: TextStyle(
+                    color: errorColor,
                     fontWeight: FontWeight.w600,
                     fontSize: 14,
                   ),
@@ -260,13 +256,17 @@ class _ScannerScreenState extends State<ScannerScreen> {
                 Text(
                   context.l10n.scanner_bluetoothOffMessage,
                   style: TextStyle(
-                    color: Colors.red.withValues(alpha: 0.85),
+                    color: errorColor.withValues(alpha: 0.85),
                     fontSize: 12,
                   ),
                 ),
               ],
             ),
           ),
+          TextButton(
+            onPressed: () => FlutterBluePlus.turnOn(),
+            child: Text(context.l10n.scanner_enableBluetooth),
+          ),
         ],
       ),
     );