feat: add UI components and assets for frontend layout

Implemented reusable UI components including AlertDialog, Accordion, Breadcrumb, Button, Card, and Calendar. Added essential assets and SVG icons for improved interface design. Integrated a base homepage layout with responsive grid structure.

frontend/lib/utils.ts

@@ -0,0 +1,6 @@
+import { clsx, type ClassValue } from "clsx"
+import { twMerge } from "tailwind-merge"
+
+export function cn(...inputs: ClassValue[]) {
+  return twMerge(clsx(inputs))
+}