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

src/shared/utils/ui.ts

@@ -0,0 +1,11 @@
+import { type ClassValue, clsx } from "clsx";
+import { twMerge } from "tailwind-merge";
+
+/**
+ * Merges Tailwind CSS classes with proper override handling
+ * @param inputs - Class values to merge
+ * @returns Merged className string
+ */
+export function cn(...inputs: ClassValue[]) {
+	return twMerge(clsx(inputs));
+}