Add runtime text shadow support

test/runtime/models/runtime_node_test.dart

@@ -33,6 +33,10 @@ void main() {
         'color': '#112233',
         'fontSize': 18,
         'textAlign': 'left',
+        'textShadowColor': '#80000000',
+        'textShadowOffsetX': 2,
+        'textShadowOffsetY': 3,
+        'textShadowBlur': 4,
         'radius': 10,
         'strokeWidth': 3,
         'value': 0.6,
@@ -91,6 +95,10 @@ void main() {
       expect(node.color, const Color(0xff112233));
       expect(node.fontSize, 18);
       expect(node.textAlign, 'left');
+      expect(node.textShadowColor, const Color(0x80000000));
+      expect(node.textShadowOffsetX, 2);
+      expect(node.textShadowOffsetY, 3);
+      expect(node.textShadowBlur, 4);
       expect(node.radius, 10);
       expect(node.strokeWidth, 3);
       expect(node.value, 0.6);
@@ -135,6 +143,10 @@ void main() {
       expect(node.rotation, 0);
       expect(node.loop, isTrue);
       expect(node.textAlign, 'center');
+      expect(node.textShadowColor, isNull);
+      expect(node.textShadowOffsetX, isNull);
+      expect(node.textShadowOffsetY, isNull);
+      expect(node.textShadowBlur, isNull);
       expect(node.scrollbarVisible, isTrue);
       expect(node.paddingLeft, 0);
       expect(node.paddingTop, 0);
@@ -175,6 +187,10 @@ void main() {
         'scrollX': 90,
         'scrollY': 80,
         'textAlign': 'right',
+        'textShadowColor': '#40000000',
+        'textShadowOffsetX': 1,
+        'textShadowOffsetY': 2,
+        'textShadowBlur': 3,
         'preset': 'trail',
         'count': 12,
       });
@@ -202,6 +218,10 @@ void main() {
       expect(updated.scrollX, 68);
       expect(updated.scrollY, 60);
       expect(updated.textAlign, 'right');
+      expect(updated.textShadowColor, const Color(0x40000000));
+      expect(updated.textShadowOffsetX, 1);
+      expect(updated.textShadowOffsetY, 2);
+      expect(updated.textShadowBlur, 3);
       expect(updated.preset, 'trail');
       expect(updated.count, 12);
     });
@@ -243,6 +263,14 @@ void main() {
         }),
         throwsFormatException,
       );
+      expect(
+        () => RuntimeNode.fromMap({
+          'id': 'a',
+          'type': 'text',
+          'textShadowBlur': -1,
+        }),
+        throwsFormatException,
+      );
       expect(
         () =>
             RuntimeNode.fromMap({'id': 'a', 'type': 'listView', 'scrollY': -1}),

test/runtime/rendering/runtime_component_test.dart

@@ -138,6 +138,31 @@ void main() {
       );
     });
 
+    test('applies text shadow style', () {
+      final component = RuntimeComponent(
+        node: const RuntimeNode(
+          id: 'text',
+          type: RuntimeNodeType.text,
+          text: 'Shadowed',
+          alpha: 0.5,
+          textShadowColor: Color(0x80000000),
+          textShadowOffsetX: 2,
+          textShadowOffsetY: 3,
+          textShadowBlur: 4,
+        ),
+        resources: GameResourceManager(),
+        onNodeTap: (_, __) {},
+      );
+
+      final text = component.children.whereType<TextComponent>().single;
+      final style = (text.textRenderer as TextPaint).style;
+      final shadow = style.shadows!.single;
+      expect(shadow.color.a, closeTo(0.25, 0.003));
+      expect(shadow.offset.dx, 2);
+      expect(shadow.offset.dy, 3);
+      expect(shadow.blurRadius, 4);
+    });
+
     test('multi-line non-button text is top aligned', () {
       final component = RuntimeComponent(
         node: const RuntimeNode(