Allow including other spendings in a budget

lib/ui/widgets/account_indicator.dart

@@ -3,7 +3,9 @@ import 'package:flutter/material.dart';
 class AccountIndicator extends StatelessWidget {
   final String accountName;
 
-  const AccountIndicator({super.key, required this.accountName});
+  final Widget? trailing;
+
+  const AccountIndicator({super.key, this.trailing, required this.accountName});
 
   @override
   Widget build(BuildContext context) {
@@ -12,12 +14,18 @@ class AccountIndicator extends StatelessWidget {
       child: Row(
         mainAxisAlignment: MainAxisAlignment.start,
         children: [
-          Text(
-            accountName,
-            style: Theme.of(context).textTheme.titleLarge,
+          Padding(
+            padding: EdgeInsets.all(8),
+            child: Text(
+              accountName,
+              style: Theme.of(context).textTheme.titleLarge,
+            ),
           ),
+          const Spacer(),
+          if (trailing != null)
+            trailing!,
         ],
-      )
+      ),
     );
   }
-}
+}