fix(framework): fix OpenUI5Support usage in applyTheme (#7485)

OpenUI5Support should have been imported as a type, not importing the feature itself. Importing the feature is done by the consumers, when they need better OpenUI5 integration.

Author: ilhan007

packages/base/src/theming/applyTheme.ts

@@ -4,7 +4,7 @@ import getThemeDesignerTheme from "./getThemeDesignerTheme.js";
 import { fireThemeLoaded } from "./ThemeLoaded.js";
 import { getFeature } from "../FeaturesRegistry.js";
 import { attachCustomThemeStylesToHead, getThemeRoot } from "../config/ThemeRoot.js";
-import OpenUI5Support from "../features/OpenUI5Support.js";
+import type OpenUI5Support from "../features/OpenUI5Support.js";
 import { DEFAULT_THEME } from "../generated/AssetParameters.js";
 import { getCurrentRuntimeIndex } from "../Runtimes.js";
 
@@ -56,7 +56,7 @@ const detectExternalTheme = async (theme: string) => {
 
 	// If OpenUI5Support is enabled, try to find out if it loaded variables
 	const openUI5Support = getFeature<typeof OpenUI5Support>("OpenUI5Support");
-	if (openUI5Support && OpenUI5Support.isOpenUI5Detected()) {
+	if (openUI5Support && openUI5Support.isOpenUI5Detected()) {
 		const varsLoaded = openUI5Support.cssVariablesLoaded();
 		if (varsLoaded) {
 			return {