neon: relax some iterable types

packages/neon/neon/lib/src/app.dart

@@ -196,13 +196,10 @@ class _NeonAppState extends State<NeonApp> with WidgetsBindingObserver, tray.Tra
       exit(0);
     }
 
-    final matches = _appRegex.allMatches(shortcutType).toList();
-    if (matches.isNotEmpty) {
+    final matches = _appRegex.allMatches(shortcutType);
     final activeAccount = _accountsBloc.activeAccount.valueOrNull;
-      if (activeAccount == null) {
-        return;
-      }
-      await _openAppFromExternal(activeAccount, matches[0].group(1)!);
+    if (matches.isNotEmpty && activeAccount != null) {
+      await _openAppFromExternal(activeAccount, matches.first.group(1)!);
     }
   }
 

packages/neon/neon/lib/src/utils/settings_export_helper.dart

@@ -33,7 +33,7 @@ class SettingsExportHelper {
 
     final accountsData = data['accounts'] as Map<String, dynamic>;
     for (final accountId in accountsData.keys) {
-      final account = accountSpecificOptions.keys.toList().find(accountId);
+      final account = accountSpecificOptions.keys.find(accountId);
       if (account == null) {
         return;
       }

packages/settings/lib/src/options/select_option.dart

@@ -25,9 +25,9 @@ class SelectOption<T> extends Option<T> {
   }
 
   T? _fromString(final Map<T, LabelBuilder> vs, final String? valueStr) {
-    final v = vs.keys.where((final e) => e.toString() == valueStr).toList();
+    final v = vs.keys.where((final e) => e.toString() == valueStr);
     if (v.length == 1) {
-      return v[0];
+      return v.first;
     }
     return null;
   }