Add symbol to home header

Adds a symbol to the left side of the welcome message and app description in the home header.

src/components/Header.tsx

@@ -1,23 +1,41 @@
+
 import React from 'react';
 import { Bell } from 'lucide-react';
 import { useAuth } from '@/contexts/auth';
+
 const Header: React.FC = () => {
   const {
     user
   } = useAuth();
   const userName = user?.user_metadata?.username || '익명';
+  
   return <header className="py-8">
       <div className="flex justify-between items-center">
         <div>
+          <div className="flex items-center mb-1">
+            <img 
+              src="/zellyy.png" 
+              alt="Zellyy" 
+              className="w-6 h-6 mr-2"
+            />
             <h1 className="text-2xl font-bold neuro-text">
               {user ? `${userName}님, 반갑습니다` : '반갑습니다'}
             </h1>
+          </div>
+          <div className="flex items-center">
+            <img 
+              src="/zellyy.png" 
+              alt="Zellyy" 
+              className="w-4 h-4 mr-2"
+            />
             <p className="text-gray-500 text-left">젤리의 적자탈출</p>
           </div>
+        </div>
         <button className="neuro-flat p-2.5 rounded-full">
           <Bell size={20} className="text-gray-600" />
         </button>
       </div>
     </header>;
 };
+
 export default Header;