fix(triggers): don't false-flag Children/Parent attribute refs in expression validation

src/ScadaLink.TemplateEngine/Validation/ValidationService.cs

@@ -428,6 +428,18 @@ public class ValidationService
 
         while ((index = expression.IndexOf(marker, index, StringComparison.Ordinal)) >= 0)
         {
+            // Only treat this as a self-attribute reference when it is not a member
+            // access. A bare `Attributes["X"]` resolves against the flattened
+            // configuration; `Children["Pump"].Attributes["X"]` and
+            // `Parent.Attributes["X"]` are member accesses (preceded by '.') whose
+            // dotted/composed canonical names cannot be checked against the flat
+            // self-attribute set — skip them rather than emit a false positive.
+            if (index > 0 && expression[index - 1] == '.')
+            {
+                index += marker.Length;
+                continue;
+            }
+
             var cursor = index + marker.Length;
             // Skip whitespace between '[' and the literal.
             while (cursor < expression.Length && char.IsWhiteSpace(expression[cursor]))