fix(insert-from-url): correct the NoInteract <-> WithDialog inversion

NoInteract state='True' means 'suppress the dialog' = 'With dialog: Off'.
The ToXml and FromXml were mapping 'WithDialog=true' to state='True'
(semantically backwards); round-trips were byte-intact but the display
text said 'With dialog: On' for steps that FM Pro authored with the
dialog suppressed and vice versa.

Also added regression tests that pin both directions of the mapping so
the invariant can't silently invert again.

Author: fuzzzerd

src/SharpFM.Model/Scripting/Steps/InsertFromUrlStep.cs

@@ -44,7 +44,9 @@ public override XElement ToXml()
             new XAttribute("enable", Enabled ? "True" : "False"),
             new XAttribute("id", XmlId),
             new XAttribute("name", XmlName),
-            new XElement("NoInteract", new XAttribute("state", WithDialog ? "True" : "False")),
+            // NoInteract is inverted: state="True" suppresses the dialog
+            // (= With dialog: Off). state="False" shows it.
+            new XElement("NoInteract", new XAttribute("state", WithDialog ? "False" : "True")),
             new XElement("DontEncodeURL", new XAttribute("state", DontEncodeUrl ? "True" : "False")),
             new XElement("SelectAll", new XAttribute("state", SelectAll ? "True" : "False")),
             new XElement("VerifySSLCertificates", new XAttribute("state", VerifySslCertificates ? "True" : "False")));
@@ -75,7 +77,8 @@ public override string ToDisplayLine()
     public static new ScriptStep FromXml(XElement step)
     {
         var enabled = step.Attribute("enable")?.Value != "False";
-        var withDialog = step.Element("NoInteract")?.Attribute("state")?.Value == "True";
+        // NoInteract inverted: state="True" = dialog suppressed = WithDialog: Off.
+        var withDialog = step.Element("NoInteract")?.Attribute("state")?.Value != "True";
         var dontEncode = step.Element("DontEncodeURL")?.Attribute("state")?.Value == "True";
         var selectAll = step.Element("SelectAll")?.Attribute("state")?.Value == "True";
         var verify = step.Element("VerifySSLCertificates")?.Attribute("state")?.Value == "True";

tests/SharpFM.Tests/Scripting/Steps/InsertFromUrlStepTests.cs

@@ -63,6 +63,34 @@ public void RealWorldShapes_RoundTrip(
             $"Round-trip mismatch.\nSource:\n{source}\n\nOutput:\n{step.ToXml()}");
     }
 
+    [Fact]
+    public void NoInteract_True_RendersAsWithDialogOff()
+    {
+        // FM Pro semantics: NoInteract state="True" suppresses the dialog.
+        // Display must say "With dialog: Off".
+        var source = XElement.Parse(
+            "<Step enable=\"True\" id=\"160\" name=\"Insert from URL\">"
+            + "<NoInteract state=\"True\" /><DontEncodeURL state=\"False\" />"
+            + "<SelectAll state=\"True\" /><VerifySSLCertificates state=\"False\" />"
+            + "</Step>");
+        var step = (InsertFromUrlStep)InsertFromUrlStep.Metadata.FromXml!(source);
+        Assert.False(step.WithDialog);
+        Assert.Contains("With dialog: Off", step.ToDisplayLine());
+    }
+
+    [Fact]
+    public void NoInteract_False_RendersAsWithDialogOn()
+    {
+        var source = XElement.Parse(
+            "<Step enable=\"True\" id=\"160\" name=\"Insert from URL\">"
+            + "<NoInteract state=\"False\" /><DontEncodeURL state=\"False\" />"
+            + "<SelectAll state=\"True\" /><VerifySSLCertificates state=\"False\" />"
+            + "</Step>");
+        var step = (InsertFromUrlStep)InsertFromUrlStep.Metadata.FromXml!(source);
+        Assert.True(step.WithDialog);
+        Assert.Contains("With dialog: On", step.ToDisplayLine());
+    }
+
     [Fact]
     public void Display_BaseShape_IsValidatorClean()
     {