Add runtime text shadow support

lib/runtime/rendering/runtime_component.dart

@@ -968,6 +968,7 @@ class RuntimeComponent extends PositionComponent
       fontWeight: node.type == RuntimeNodeType.button
           ? FontWeight.w600
           : FontWeight.normal,
+      shadows: _textShadows(node),
     );
 
     final component = _textComponent;
@@ -1033,6 +1034,23 @@ class RuntimeComponent extends PositionComponent
     return (node.text ?? '').contains('\n');
   }
 
+  List<Shadow>? _textShadows(RuntimeNode node) {
+    final color = node.textShadowColor;
+    if (color == null) {
+      return null;
+    }
+    return [
+      Shadow(
+        color: composeRuntimeColorAlpha(color, renderAlpha),
+        offset: Offset(
+          node.textShadowOffsetX ?? 0,
+          node.textShadowOffsetY ?? 0,
+        ),
+        blurRadius: node.textShadowBlur ?? 0,
+      ),
+    ];
+  }
+
   Color _textColor(RuntimeNode node) {
     if (node.type == RuntimeNodeType.button) {
       return Colors.white;