feat: add scroll-to-top button on all pages

- Create reusable ScrollToTop component with smooth animations
- Add ChevronUp icon from lucide-react (no asset needed)
- Button appears after scrolling 300px
- Smooth fade-in/fade-out animations with Framer Motion
- Hover effects with scale and lift animations
- Responsive design with mobile-friendly sizing
- Dark mode compatible
- Accessible with proper ARIA labels
- Remove duplicate scroll-to-top button from NewsDetailPage
- Add component to App.tsx to appear on all pages

Author: 7se7en72025

src/App.tsx

@@ -1,6 +1,7 @@
 import { useEffect } from 'react';
 import { RouterProvider } from 'react-router-dom';
 import router from '@/routes';
+import ScrollToTop from '@/components/shared/ScrollToTop';
 
 const App = () => {
   useEffect(() => {
@@ -25,6 +26,7 @@ const App = () => {
   return (
     <div className="min-h-screen flex flex-col bg-white dark:bg-gray-900">
       <RouterProvider router={router} />
+      <ScrollToTop />
     </div>
   );
 };

src/components/shared/ScrollToTop.tsx

@@ -0,0 +1,57 @@
+import { useState, useEffect } from 'react';
+import { motion, AnimatePresence } from 'framer-motion';
+import { ChevronUp } from 'lucide-react';
+
+const ScrollToTop = () => {
+  const [isVisible, setIsVisible] = useState(false);
+
+  useEffect(() => {
+    const toggleVisibility = () => {
+      if (window.scrollY > 300) {
+        setIsVisible(true);
+      } else {
+        setIsVisible(false);
+      }
+    };
+
+    window.addEventListener('scroll', toggleVisibility);
+
+    return () => {
+      window.removeEventListener('scroll', toggleVisibility);
+    };
+  }, []);
+
+  const scrollToTop = () => {
+    window.scrollTo({
+      top: 0,
+      behavior: 'smooth',
+    });
+  };
+
+  return (
+    <AnimatePresence>
+      {isVisible && (
+        <motion.button
+          onClick={scrollToTop}
+          className="fixed bottom-6 right-6 sm:bottom-8 sm:right-8 z-50 p-3 sm:p-4 bg-gradient-to-r from-blue-600 to-blue-700 hover:from-blue-700 hover:to-blue-800 text-white rounded-full shadow-lg hover:shadow-xl transition-all duration-300 focus:outline-none focus:ring-2 focus:ring-blue-400 focus:ring-offset-2 dark:focus:ring-offset-gray-900"
+          aria-label="Scroll to top"
+          initial={{ opacity: 0, scale: 0.5, y: 20 }}
+          animate={{ opacity: 1, scale: 1, y: 0 }}
+          exit={{ opacity: 0, scale: 0.5, y: 20 }}
+          whileHover={{ scale: 1.1, y: -2 }}
+          whileTap={{ scale: 0.95 }}
+          transition={{
+            type: 'spring',
+            stiffness: 500,
+            damping: 30,
+          }}
+        >
+          <ChevronUp className="h-5 w-5 sm:h-6 sm:w-6" aria-hidden="true" />
+        </motion.button>
+      )}
+    </AnimatePresence>
+  );
+};
+
+export default ScrollToTop;
+

src/pages/News/NewsDetailPage.tsx

@@ -361,33 +361,6 @@ const NewsDetailPage: React.FC = () => {
             </div>
           </div>
         )}
-
-        {/* Back to Top Button */}
-        <div className="fixed bottom-8 right-8 z-50">
-          <motion.button
-            onClick={() => window.scrollTo({ top: 0, behavior: 'smooth' })}
-            className="p-3 bg-blue-600 text-white rounded-full shadow-lg hover:bg-blue-700 transition-colors focus:outline-none focus:ring-2 focus:ring-blue-400"
-            aria-label="Back to top"
-            whileHover={{ scale: 1.05 }}
-            whileTap={{ scale: 0.95 }}
-          >
-            <svg
-              xmlns="http://www.w3.org/2000/svg"
-              className="h-6 w-6"
-              fill="none"
-              viewBox="0 0 24 24"
-              stroke="currentColor"
-              aria-hidden="true"
-            >
-              <path
-                strokeLinecap="round"
-                strokeLinejoin="round"
-                strokeWidth={2}
-                d="M5 15l7-7 7 7"
-              />
-            </svg>
-          </motion.button>
-        </div>
       </div>
 
       {/* Image Modal */}