refactor: simplify user authentication handling in me.get.ts

Replace session ID retrieval and validation logic with a direct call to requireUser() for improved clarity and efficiency in user authentication. This change streamlines the error handling process by ensuring that session cookies are cleared only when necessary.

server/api/auth/me.get.ts

@@ -4,16 +4,7 @@ import { toPublicAuthError } from "#server/service/auth/errors";
 
 export default defineWrappedResponseHandler(async (event) => {
     try {
-        const sessionId = getSessionId(event);
+        const user = await event.context.auth.requireUser();
-        if (!sessionId) {
-            clearSessionCookie(event);
-            throw createError({
-                statusCode: 401,
-                statusMessage: UNAUTHORIZED_MESSAGE,
-            });
-        }
-
-        const user = await event.context.auth.getCurrent();
         if (!user) {
             clearSessionCookie(event);
             throw createError({