Add POI feature and imporve the overall backend implementation

frontend/src/components/ui/Loader.tsx

@@ -0,0 +1,26 @@
+import React from 'react';
+import { Loader2 } from 'lucide-react';
+
+interface LoaderProps {
+  size?: 'sm' | 'md' | 'lg' | 'default';
+  text?: string;
+  className?: string;
+}
+
+const Loader: React.FC<LoaderProps> = ({ size = 'default', text, className = '' }) => {
+  const sizeClasses = {
+    sm: 'h-4 w-4',
+    md: 'h-6 w-6',
+    lg: 'h-8 w-8',
+    default: 'h-10 w-10',
+  };
+
+  return (
+    <div className={`flex flex-col items-center justify-center ${className}`}>
+      <Loader2 className={`animate-spin text-primary ${sizeClasses[size]}`} />
+      {text && <span className="mt-2 text-sm text-muted-foreground">{text}</span>}
+    </div>
+  );
+};
+
+export { Loader };