refactor(core): move app para src e padroniza estrutura

src/shared/components/ui/spinner.tsx

@@ -0,0 +1,15 @@
+import { RiLoader4Line } from "@remixicon/react";
+import { cn } from "@/shared/utils/ui";
+
+function Spinner({ className, ...props }: React.ComponentProps<"svg">) {
+	return (
+		<RiLoader4Line
+			role="status"
+			aria-label="Loading"
+			className={cn("size-4 animate-spin", className)}
+			{...props}
+		/>
+	);
+}
+
+export { Spinner };