fix(landing): 인증 상태에 따라 CTA 경로 분기

src/app/(landing)/page.tsx

@@ -1,5 +1,6 @@
 import Link from "next/link";
 import { copy } from '@/shared/i18n';
+import { AuthLandingLoginButton } from "@/features/auth/components/AuthLandingLoginButton";
 import { AuthRedirectButton } from "@/features/auth/components/AuthRedirectButton";
 import { Button } from "@/shared/ui/Button";
 
@@ -19,7 +20,9 @@ export default function MarketingPage() {
           <nav className="hidden md:flex items-center gap-6 text-sm font-medium text-brand-dark/80">
             <Button variant="ghost" size="sm" href="#features">{landing.nav.features}</Button>
             <Button variant="ghost" size="sm" href="#pricing">{landing.nav.pricing}</Button>
-            <Button variant="ghost" size="sm" href="/login">{landing.nav.login}</Button>
+            <AuthLandingLoginButton variant="ghost" size="sm">
+              {landing.nav.login}
+            </AuthLandingLoginButton>
             <AuthRedirectButton variant="primary" size="md">{landing.nav.startFree}</AuthRedirectButton>
           </nav>
         </div>

src/features/auth/components/AuthLandingLoginButton.tsx

@@ -0,0 +1,38 @@
+'use client';
+
+import type { ReactNode } from 'react';
+import { useAuthStore } from '@/entities/auth';
+import { Button, type ButtonSize, type ButtonVariant } from '@/shared/ui/Button';
+import { hasClientAuth } from '../model/hasClientAuth';
+
+interface AuthLandingLoginButtonProps {
+  children: ReactNode;
+  className?: string;
+  size?: ButtonSize;
+  variant?: ButtonVariant;
+}
+
+export function AuthLandingLoginButton({
+  children,
+  className,
+  size = 'sm',
+  variant = 'ghost',
+}: AuthLandingLoginButtonProps) {
+  const accessToken = useAuthStore((state) => state.accessToken);
+  const isAuthenticated = useAuthStore((state) => state.isAuthenticated);
+
+  if (
+    hasClientAuth({
+      accessToken,
+      isAuthenticated,
+    })
+  ) {
+    return null;
+  }
+
+  return (
+    <Button href="/login" variant={variant} size={size} className={className}>
+      {children}
+    </Button>
+  );
+}

src/features/auth/components/AuthRedirectButton.tsx

@@ -1,11 +1,10 @@
 'use client';
 
-import Cookies from 'js-cookie';
 import { useRouter } from 'next/navigation';
 import type { ReactNode } from 'react';
 import { useAuthStore } from '@/entities/auth';
-import { TOKEN_COOKIE_KEY } from '@/shared/config/authTokens';
 import { Button, type ButtonSize, type ButtonVariant } from '@/shared/ui/Button';
+import { hasClientAuth } from '../model/hasClientAuth';
 
 interface AuthRedirectButtonProps {
   children: ReactNode;
@@ -21,7 +20,7 @@ export function AuthRedirectButton({
   className,
   size = 'md',
   variant = 'primary',
-  authenticatedHref = '/space',
+  authenticatedHref = '/app',
   unauthenticatedHref = '/login',
 }: AuthRedirectButtonProps) {
   const router = useRouter();
@@ -29,8 +28,14 @@ export function AuthRedirectButton({
   const isAuthenticated = useAuthStore((state) => state.isAuthenticated);
 
   const handleClick = () => {
-    const hasAccessToken = isAuthenticated || Boolean(accessToken) || Boolean(Cookies.get(TOKEN_COOKIE_KEY));
-    router.push(hasAccessToken ? authenticatedHref : unauthenticatedHref);
+    router.push(
+      hasClientAuth({
+        accessToken,
+        isAuthenticated,
+      })
+        ? authenticatedHref
+        : unauthenticatedHref,
+    );
   };
 
   return (

src/features/auth/model/hasClientAuth.ts

@@ -0,0 +1,13 @@
+'use client';
+
+import Cookies from 'js-cookie';
+import { TOKEN_COOKIE_KEY } from '@/shared/config/authTokens';
+
+interface HasClientAuthInput {
+  accessToken: string | null;
+  isAuthenticated: boolean;
+}
+
+export const hasClientAuth = ({ accessToken, isAuthenticated }: HasClientAuthInput) => {
+  return isAuthenticated || Boolean(accessToken) || Boolean(Cookies.get(TOKEN_COOKIE_KEY));
+};