Toast: close button, action color and corner radius

ShowToastAction gains showCloseButton, actionColor and cornerRadius, all
left out of the JSON at their defaults.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012anUJ6o6K6kjUXur8Ak8XX

Author: claude

lib/src/api/models/action/show_toast_action.dart

@@ -91,6 +91,16 @@ class ShowToastAction extends ActionModel with Equatable, SerializableMixin {
   /// [ToastPosition.bottom].
   final double bottomOffset;
 
+  /// Whether the toast shows a close (×) button that dismisses it.
+  final bool showCloseButton;
+
+  /// Color of the button's label. Null takes the message color.
+  final ColorRGBA? actionColor;
+
+  /// Corner radius. Null is a pill without a button, the theme's button
+  /// radius with one.
+  final double? cornerRadius;
+
   /// Creates a new [ShowToastAction].
   ShowToastAction({
     required this.message,
@@ -103,6 +113,9 @@ class ShowToastAction extends ActionModel with Equatable, SerializableMixin {
     List<ActionModel>? actions,
     this.icon,
     this.bottomOffset = 104,
+    this.showCloseButton = false,
+    this.actionColor,
+    this.cornerRadius,
     super.nonBlocking,
     super.enabled,
   }) : actions = actions ?? [],
@@ -123,6 +136,9 @@ class ShowToastAction extends ActionModel with Equatable, SerializableMixin {
     actions,
     icon,
     bottomOffset,
+    showCloseButton,
+    actionColor,
+    cornerRadius,
   ];
 
   /// Duplicates this [ShowToastAction] with given data overrides.
@@ -140,6 +156,11 @@ class ShowToastAction extends ActionModel with Equatable, SerializableMixin {
     MultiSourceIconModel? icon,
     bool clearIcon = false,
     double? bottomOffset,
+    bool? showCloseButton,
+    ColorRGBA? actionColor,
+    bool clearActionColor = false,
+    double? cornerRadius,
+    bool clearCornerRadius = false,
   }) => ShowToastAction(
     message: message ?? this.message,
     duration: duration ?? this.duration,
@@ -153,6 +174,9 @@ class ShowToastAction extends ActionModel with Equatable, SerializableMixin {
     actions: actions ?? this.actions,
     icon: clearIcon ? null : icon ?? this.icon,
     bottomOffset: bottomOffset ?? this.bottomOffset,
+    showCloseButton: showCloseButton ?? this.showCloseButton,
+    actionColor: clearActionColor ? null : actionColor ?? this.actionColor,
+    cornerRadius: clearCornerRadius ? null : cornerRadius ?? this.cornerRadius,
     nonBlocking: nonBlocking,
     enabled: enabled,
   );

lib/src/api/models/action/show_toast_action.g.dart

@@ -75,4 +75,28 @@ void main() {
 
     expect(toast.copyWith(clearBackgroundColor: true).backgroundColor, isNull);
   });
+
+  test('close button, action color and corner radius round-trip', () {
+    final ShowToastAction plain = ShowToastAction(message: 'Saved');
+    final Map plainJson = plain.toJson();
+    expect(plainJson.containsKey('showCloseButton'), isFalse);
+    expect(plainJson.containsKey('actionColor'), isFalse);
+    expect(plainJson.containsKey('cornerRadius'), isFalse);
+
+    final ShowToastAction toast = ShowToastAction(
+      message: '#025 deleted',
+      actionLabel: 'Undo',
+      showCloseButton: true,
+      actionColor: ColorRGBA.fromHex('#FF6A13'),
+      cornerRadius: 10,
+    );
+    final Map json = toast.toJson();
+    expect(json['showCloseButton'], isTrue);
+    expect(json['cornerRadius'], 10);
+    final ShowToastAction decoded =
+        ActionModel.fromJson(json) as ShowToastAction;
+    expect(decoded, toast);
+    expect(decoded.actionColor, ColorRGBA.fromHex('#FF6A13'));
+    expect(decoded.copyWith(clearCornerRadius: true).cornerRadius, isNull);
+  });
 }