refactor: deduplicate & other code quality fixes

lib/utils/dialogs.dart

@@ -0,0 +1,33 @@
+import 'package:flutter/material.dart';
+import '../i18n/strings.g.dart';
+
+/// Utility functions for showing common dialogs
+
+/// Shows a delete confirmation dialog
+/// Returns true if user confirmed, false if cancelled
+Future<bool> showDeleteConfirmation(
+  BuildContext context, {
+  required String title,
+  required String message,
+}) async {
+  final confirmed = await showDialog<bool>(
+    context: context,
+    builder: (context) => AlertDialog(
+      title: Text(title),
+      content: Text(message),
+      actions: [
+        TextButton(
+          onPressed: () => Navigator.pop(context, false),
+          child: Text(t.common.cancel),
+        ),
+        TextButton(
+          onPressed: () => Navigator.pop(context, true),
+          style: TextButton.styleFrom(foregroundColor: Colors.red),
+          child: Text(t.common.delete),
+        ),
+      ],
+    ),
+  );
+
+  return confirmed ?? false;
+}