feat: redesign and lots of progress

lib/util/bluetooth_settings.dart

@@ -0,0 +1,44 @@
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+const MethodChannel _settingsChannel = MethodChannel('abawo/settings');
+
+Future<bool> openBluetoothSettings() async {
+  if (!Platform.isAndroid) {
+    return false;
+  }
+
+  try {
+    return await _settingsChannel.invokeMethod<bool>('openBluetoothSettings') ??
+        false;
+  } on PlatformException {
+    return false;
+  }
+}
+
+Future<void> showBluetoothPairingRecoveryDialog(BuildContext context) {
+  return showDialog<void>(
+    context: context,
+    builder: (context) => AlertDialog(
+      title: const Text('Bluetooth pairing may be broken'),
+      content: const Text(
+        'The connection opened, then broke while reading the device. This is probably a pairing problem.\n\nOpen Bluetooth settings, remove/forget this device, then come back and connect again.',
+      ),
+      actions: [
+        TextButton(
+          onPressed: () => Navigator.of(context).pop(),
+          child: const Text('Not now'),
+        ),
+        FilledButton(
+          onPressed: () async {
+            Navigator.of(context).pop();
+            await openBluetoothSettings();
+          },
+          child: const Text('Open Bluetooth settings'),
+        ),
+      ],
+    ),
+  );
+}