refactor: centralize access token handling in cookies and improve related functions

- Introduced utility functions for managing access tokens in cookies, including setting, getting, and clearing tokens.
- Updated various components and server routes to utilize the new access token functions for better consistency and maintainability.
- Removed redundant cookie handling code across the application, streamlining the authentication process.

frontend/src/hooks.server.ts

@@ -1,6 +1,7 @@
 import type { Handle } from '@sveltejs/kit';
 import { paraglideMiddleware } from '$lib/paraglide/server';
 import { sequence } from '@sveltejs/kit/hooks';
+import { getAccessTokenFromCookies } from '$lib/server/access-token-cookie';
 
 const handleParaglide: Handle = ({ event, resolve }) => paraglideMiddleware(event.request, ({ request, locale }) => {
 	event.request = request;
@@ -12,7 +13,7 @@ const handleParaglide: Handle = ({ event, resolve }) => paraglideMiddleware(even
 
 const handleAuth: Handle = async ({ event, resolve }) => {
 	// Obtener el token de las cookies
-	const token = event.cookies.get('access_token');
+	const token = getAccessTokenFromCookies(event.cookies);
 	
 	// Agregar el token a los locals para que esté disponible en toda la app
 	event.locals.token = token || null;