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/app/scroll/scroll.service.spec.ts

@@ -0,0 +1,16 @@
+import { TestBed } from '@angular/core/testing';
+
+import { ScrollService } from './scroll.service';
+
+describe('ScrollService', () => {
+  let service: ScrollService;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({});
+    service = TestBed.inject(ScrollService);
+  });
+
+  it('should be created', () => {
+    expect(service).toBeTruthy();
+  });
+});

frontend/src/app/scroll/scroll.service.ts

@@ -0,0 +1,14 @@
+import {Injectable} from '@angular/core';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class ScrollService {
+  scrollToTop(): void {
+    window.scrollTo({
+      top: 0,
+      behavior: 'smooth'
+    });
+  }
+}
+