src/lib/components/Layout/AppHeader.svelte

<script lang="ts">
  import { authStore } from '$lib/stores/auth';
  import type { HuggingFaceLibs } from '$lib/types';
  
  interface Props {
    hfAuth: HuggingFaceLibs | null;
    currentTab?: string;
  }
  
  let { hfAuth, currentTab = 'Piclets' }: Props = $props();
  const auth = $derived(authStore);
  
  async function handleSignIn() {
    if (!hfAuth) return;
    
    const url = await hfAuth.oauthLoginUrl({ scopes: ["inference-api"] });
    window.location.href = url;
  }
</script>

<header class="app-header">
  <h1 class="app-title">{currentTab}</h1>
  
  {#if $auth.showSignIn && !$auth.userInfo}
    <button class="sign-in-btn" onclick={handleSignIn}>
      Sign In
    </button>
  {:else if $auth.userInfo}
    <div class="user-info">
      <span class="username">{$auth.userInfo.preferred_username || 'User'}</span>
    </div>
  {/if}
</header>

{#if $auth.bannerMessage}
  <div class="auth-banner">
    {$auth.bannerMessage}
  </div>
{/if}

<style>
  .app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    padding-top: calc(1rem + env(safe-area-inset-top, 0));
    position: sticky;
    top: 0;
    z-index: 100;
  }
  
  .app-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 700;
    color: #333;
  }
  
  .sign-in-btn {
    padding: 0.5rem 1rem;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
  }
  
  .sign-in-btn:active {
    background: #0056b3;
  }
  
  .user-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  .username {
    font-size: 0.875rem;
    color: #666;
    font-weight: 500;
  }
  
  .auth-banner {
    padding: 0.75rem 1rem;
    background: #fff3cd;
    color: #856404;
    font-size: 0.875rem;
    text-align: center;
    border-bottom: 1px solid #ffeeba;
  }
</style>