refactor(cms): deduplicate shared admin components and fix studio batch completion

- fix(studio): stop markBatchDone infinite recursion so batches complete
- refactor(api): merge api-response into api and drop the duplicate module
- refactor(media): extract shared media loader and URL validator
- refactor(ui): extract shared LoadingSpinner for site and admin groups
- refactor(dates): consolidate raw date formatting into formatDate util
- refactor(logs): share a single generic log-list loader across tables
- refactor(theme): merge both ColorField components and reuse contrast helpers
- refactor(import): extract shared ImportErrorBanner and SearchInput
- chore(): remove dead theme-editor-tabs after inlining tab components

src/app/(site)/shop/loading.tsx

@@ -1,15 +1,5 @@
-export default function ShopLoading() {
-	return (
-		<div
-			style={{ display: "flex", justifyContent: "center", padding: "4rem 0" }}
-		>
-			<div
-				className="animate-spin w-8 h-8 border-4 rounded-full"
-				style={{
-					borderColor: "var(--color-primary)",
-					borderTopColor: "transparent",
-				}}
-			/>
-		</div>
-	);
+import { LoadingSpinner } from "@/components/ui/loading-spinner";
+
+export default function Loading() {
+	return <LoadingSpinner />;
 }