feat: snackbar for flash err + disconnect on dfurecovery end

lib/pages/bootloader_recovery_update_page.dart

@@ -59,11 +59,43 @@ class _BootloaderRecoveryUpdatePageState
 
   @override
   void dispose() {
+    final service = _firmwareUpdateService;
+    final bluetooth = ref.read(bluetoothProvider).valueOrNull;
+    _firmwareUpdateService = null;
     unawaited(_firmwareProgressSubscription?.cancel());
-    unawaited(_firmwareUpdateService?.dispose() ?? Future<void>.value());
+    unawaited(() async {
+      await service?.dispose();
+      await _disconnectBootloaderIfStillConnected(bluetooth: bluetooth);
+    }());
     super.dispose();
   }
 
+  Future<void> _disconnectBootloaderIfStillConnected({
+    BluetoothController? bluetooth,
+  }) async {
+    bluetooth ??= ref.read(bluetoothProvider).valueOrNull;
+    if (bluetooth == null) {
+      return;
+    }
+
+    final currentState = bluetooth.currentConnectionState;
+    if (currentState.$2 != widget.args.bootloaderDeviceId ||
+        (currentState.$1 != ConnectionStatus.connected &&
+            currentState.$1 != ConnectionStatus.connecting)) {
+      return;
+    }
+
+    await bluetooth.disconnect();
+  }
+
+  Future<void> _dismissToDevices() async {
+    await _disconnectBootloaderIfStillConnected();
+    if (!mounted) {
+      return;
+    }
+    context.go('/devices');
+  }
+
   Future<FirmwareUpdateService?> _ensureFirmwareUpdateService() async {
     if (_firmwareUpdateService != null) {
       return _firmwareUpdateService;
@@ -144,9 +176,24 @@ class _BootloaderRecoveryUpdatePageState
     if (!mounted || result.isOk()) {
       return;
     }
+    await _disconnectBootloaderIfStillConnected();
+    if (!mounted) {
+      return;
+    }
+    final errorMessage = result.unwrapErr().toString();
     setState(() {
-      _firmwareUserMessage = result.unwrapErr().toString();
+      _firmwareUserMessage = errorMessage;
     });
+
+    if (errorMessage.startsWith(universalShifterBootMetadataWarningMessage)) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+          content: Text(
+            'WARNING: The device failed writing to its internal storage. This might be a temporary problem. If it continues happening, the internal storage may be broken. If so, please contact abawo support',
+          ),
+        ),
+      );
+    }
   }
 
   String _dfuPhaseText(DfuUpdateState state) {
@@ -190,7 +237,7 @@ class _BootloaderRecoveryUpdatePageState
           '0x${_dfuProgress.expectedOffset.toRadixString(16).padLeft(8, '0').toUpperCase()}',
       doneLabel: 'Back to devices',
       failedLabel: 'Back to devices',
-      onDismiss: () => context.go('/devices'),
+      onDismiss: () => unawaited(_dismissToDevices()),
     );
   }
 }