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/l10n/app_localizations_zh.dart

@@ -142,6 +142,15 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get scanner_scan => '扫描';
 
+  @override
+  String get scanner_bluetoothOff => '蓝牙已关闭';
+
+  @override
+  String get scanner_bluetoothOffMessage => '请打开蓝牙功能，以便搜索设备。';
+
+  @override
+  String get scanner_enableBluetooth => '启用蓝牙';
+
   @override
   String get device_quickSwitch => '快速切换';