fixes

- apply fixed height for footer buttons over app
- add floating cart button in cart page in desktop size

src/pages/menu/components/CartButton/CartButton.module.css

@@ -0,0 +1,23 @@
+/* Scroll to Top Button */
+.scrollToTopButton {
+  animation: fadeInUp 0.3s ease-out;
+  transition: all 0.3s ease;
+}
+
+.scrollToTopButton:hover {
+  transform: translateY(-2px);
+  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2) !important;
+}
+
+/* Dark theme scroll to top button */
+:global(.darkApp) .scrollToTopButton {
+  background-color: var(--primary) !important;
+  border-color: var(--primary) !important;
+  color: #000000 !important;
+}
+
+:global(.darkApp) .scrollToTopButton:hover {
+  background-color: #ffd633 !important;
+  border-color: #ffd633 !important;
+  box-shadow: 0 6px 16px rgba(255, 198, 0, 0.3) !important;
+}