Add login functionality

components/Header.vue

@@ -1,10 +1,67 @@
+<script setup lang="ts">
+import { onMounted } from 'vue'
+import { useState, useRuntimeConfig } from '#imports'
+
+// Using Nuxt's useState composable instead of Vue's ref
+const config = useRuntimeConfig()
+const apiBase = config.public.apiBase
+
+const user = useState('user', () => ({}))
+const isLoggedIn = useState('isLoggedIn', () => false)
+
+onMounted(() => {
+  // Checking if code is running in browser environment before accessing localStorage
+  if (process.client) {
+    try {
+      const userData = JSON.parse(localStorage.getItem('user') || '{}')
+      user.value = userData
+      if (Object.keys(userData).length > 0) {
+        isLoggedIn.value = true
+        
+      }
+    } catch (error) {
+      console.error('Error accessing localStorage:', error)
+    }
+  }
+})
+
+const logout = () => {
+  if (process.client) {
+    try {
+      localStorage.removeItem('user')
+      isLoggedIn.value = false
+      user.value = {}
+    } catch (error) {
+      console.error('Error during logout:', error)
+    }
+  }
+}
+</script>
+
 <template>
     <header class="p-4 shadow-md flex justify-between bg-slate-100">
         <h1><NuxtLink to="/">Eurovision 2025</NuxtLink></h1>
         <nav>
-            <ul class="flex gap-4">
-                <li><NuxtLink to="/profile">Profile</NuxtLink></li>
-                <li><NuxtLink to="/login">Login</NuxtLink></li>
+            <ul class="flex items-center gap-4">
+                <li v-if="isLoggedIn" class="flex items-center gap-2">
+                    <NuxtLink to="/profile">
+                    <NuxtImg 
+                        v-if="'avatar_id' in user" 
+                        :src="`${apiBase}/static/avatars/${user.avatar_id}.webp`" 
+                        class="w-4 h-4 rounded-full object-cover" 
+                        :alt="user.username"
+                    /></NuxtLink>
+                </li>
+                <li v-if="!isLoggedIn">
+                    <NuxtLink to="/login" class="flex items-center gap-1">
+                        <Icon name="qlementine-icons:log-in-16" class="w-5 h-5" />
+                    </NuxtLink>
+                </li>
+                <li v-if="isLoggedIn">
+                    <button @click="logout" class="flex items-center gap-1">
+                        <Icon name="qlementine-icons:log-out-16" class="w-5 h-5" />
+                    </button>
+                </li>
             </ul>
         </nav>
     </header>