Refactor scrolling and enhance UI accessibility.

Replaced inline JavaScript for scrolling and copy functionality with Angular methods. Introduced `ScrollService` for smooth scroll-to-top functionality and added associated styles. Removed unused `isHomePage` method and cleaned up components for better maintainability.

frontend/src/styles.scss

@@ -337,4 +337,54 @@ tr {
   transition: 0.5s background ease;
 }
 
+
+.scroll-up-button.active:hover {
+  opacity: 1.0;
+}
+
+.scroll-up-button.active {
+  opacity: 0.5;
+}
+
+.scroll-up-button {
+  opacity: 0.0;
+  width: 60px;
+  height: 60px;
+  border-radius: 5px;
+  background-color: var(--link-color);
+  position: fixed;
+  right: 30px;
+  bottom: 30px;
+  transition: opacity 0.3s, 0.5s ease;
+}
+
+.scroll-up-button span::after {
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  content: '';
+  width: 8px;
+  height: 8px;
+  margin: -2px 0 0 -5px;
+  border-left: 2px solid #fff;
+  border-bottom: 2px solid #fff;
+  -webkit-transform: rotate(135deg);
+  transform: rotate(135deg);
+  box-sizing: border-box;
+}
+
+.scroll-up-button span::before {
+  position: absolute;
+  top: 0;
+  left: 0;
+  z-index: -1;
+  content: '';
+  width: 60px;
+  height: 60px;
+  box-shadow: 0 0 0 0 rgba(255, 255, 255, .1);
+  border-radius: 100%;
+  opacity: 0;
+  box-sizing: border-box;
+}
+
 /* main css end */