Fix theme store race condition (#4885)

Co-authored-by: Calum H. <contact@cal.engineer>

apps/app-frontend/src/App.vue

@@ -221,7 +221,6 @@ const messages = defineMessages({
 })
 
 async function setupApp() {
-	stateInitialized.value = true
 	const {
 		native_decorations,
 		theme,
@@ -260,6 +259,7 @@ async function setupApp() {
 	themeStore.toggleSidebar = toggle_sidebar
 	themeStore.devMode = developer_mode
 	themeStore.featureFlags = feature_flags
+	stateInitialized.value = true
 
 	isMaximized.value = await getCurrentWindow().isMaximized()