refactor: rename DTree to DValue

site/examples/uce-starter/views/themes.uce

@@ -2,7 +2,7 @@
 
 COMPONENT(Request& context)
 {
-	DTree asset_props;
+	DValue asset_props;
 	asset_props["css"]["0"] = "views/themes.css";
 	print(component("../components/theme/assets", asset_props, context));
 	context.call["app"]["page_title"] = "Themes";
@@ -16,7 +16,7 @@ COMPONENT(Request& context)
 				<p>Open each theme preview directly to judge shell fit, typography, and token balance.</p>
 			</section>
 			<div class="theme-gallery-grid">
-				<? context.cfg.get_by_path("theme/options").each([&](DTree theme_info, String theme_key) {
+				<? context.cfg.get_by_path("theme/options").each([&](DValue theme_info, String theme_key) {
 					StringMap params;
 					params["theme"] = theme_key;
 					String preview_href = app_link("theme-preview", params, context);