feat(search): live debounced search with inline hits and header dropdown

Homepage (/):
- Tippen > 3 Zeichen + 300 ms Debounce → lokale Suche feuert automatisch
- Treffer erscheinen direkt unter dem Suchfeld als Karten-Grid
- "Zuletzt hinzugefügt" wird ausgeblendet, sobald aktiv gesucht wird
- 0 Treffer + fertig gesucht → Inline-Button "Im Internet weitersuchen"

Header (nur auf /recipes/[id] und /preview):
- Gleiche Debounce-Logik, aber Treffer in einem Dropdown unterm Feld
- Dropdown: kompakte Zeilen mit Thumbnail, Titel, Domain
- Fußzeile des Dropdown: "Im Internet weitersuchen"
- Click-outside und Escape schließen das Dropdown
- afterNavigate setzt Query nach dem Klick auf einen Treffer zurück
- Header-Breite ist jetzt auf 760 px begrenzt (gleich wie Rezept-Content),
  damit die Suchleiste nie breiter wird als das Rezept darunter

Race-Safety: Ein zweites Tippen während laufender Fetch überschreibt
die Ergebnisse des ersten Requests nicht (Query-Vergleich vor Write).

src/routes/+layout.svelte

@@ -1,56 +1,159 @@
 <script lang="ts">
   import { onMount } from 'svelte';
   import { page } from '$app/stores';
-  import { goto } from '$app/navigation';
+  import { goto, afterNavigate } from '$app/navigation';
   import { profileStore } from '$lib/client/profile.svelte';
   import ProfileSwitcher from '$lib/components/ProfileSwitcher.svelte';
   import ConfirmDialog from '$lib/components/ConfirmDialog.svelte';
+  import type { SearchHit } from '$lib/server/recipes/search-local';
 
   let { children } = $props();
 
   let navQuery = $state('');
+  let navHits = $state<SearchHit[]>([]);
+  let navSearching = $state(false);
+  let navOpen = $state(false);
+  let navContainer: HTMLElement | undefined = $state();
+  let debounceTimer: ReturnType<typeof setTimeout> | null = null;
+
+  const showHeaderSearch = $derived(
+    $page.url.pathname.startsWith('/recipes/') || $page.url.pathname === '/preview'
+  );
 
   $effect(() => {
-    const path = $page.url.pathname;
-    if (path === '/search' || path === '/search/web') {
-      navQuery = ($page.url.searchParams.get('q') ?? '').trim();
+    const q = navQuery.trim();
+    if (debounceTimer) clearTimeout(debounceTimer);
+    if (q.length <= 3) {
+      navHits = [];
+      navSearching = false;
+      navOpen = false;
+      return;
     }
+    navSearching = true;
+    navOpen = true;
+    debounceTimer = setTimeout(async () => {
+      try {
+        const res = await fetch(`/api/recipes/search?q=${encodeURIComponent(q)}`);
+        const body = await res.json();
+        if (navQuery.trim() === q) navHits = body.hits;
+      } finally {
+        if (navQuery.trim() === q) navSearching = false;
+      }
+    }, 300);
   });
 
-  const showHeaderSearch = $derived($page.url.pathname !== '/');
-
-  function submitNavSearch(e: SubmitEvent) {
+  function submitNav(e: SubmitEvent) {
     e.preventDefault();
     const q = navQuery.trim();
     if (!q) return;
+    navOpen = false;
     void goto(`/search?q=${encodeURIComponent(q)}`);
   }
 
+  function handleClickOutside(e: MouseEvent) {
+    if (navContainer && !navContainer.contains(e.target as Node)) {
+      navOpen = false;
+    }
+  }
+
+  function handleKey(e: KeyboardEvent) {
+    if (e.key === 'Escape' && navOpen) navOpen = false;
+  }
+
+  function pickHit() {
+    navOpen = false;
+    navQuery = '';
+    navHits = [];
+  }
+
+  afterNavigate(() => {
+    navQuery = '';
+    navHits = [];
+    navOpen = false;
+  });
+
   onMount(() => {
     profileStore.load();
+    document.addEventListener('click', handleClickOutside);
+    document.addEventListener('keydown', handleKey);
+    return () => {
+      document.removeEventListener('click', handleClickOutside);
+      document.removeEventListener('keydown', handleKey);
+    };
   });
 </script>
 
 <ConfirmDialog />
 
 <header class="bar">
-  <a href="/" class="brand">Kochwas</a>
-  {#if showHeaderSearch}
-    <form class="nav-search" onsubmit={submitNavSearch} role="search">
-      <input
-        type="search"
-        bind:value={navQuery}
-        placeholder="Rezept suchen…"
-        autocomplete="off"
-        inputmode="search"
-        aria-label="Suchbegriff"
-      />
-    </form>
-  {/if}
-  <div class="bar-right">
-    <a href="/wishlist" class="nav-link" aria-label="Wunschliste">🍽️</a>
-    <a href="/admin" class="nav-link" aria-label="Einstellungen">⚙️</a>
-    <ProfileSwitcher />
+  <div class="bar-inner">
+    <a href="/" class="brand">Kochwas</a>
+    {#if showHeaderSearch}
+      <div class="nav-search-wrap" bind:this={navContainer}>
+        <form class="nav-search" onsubmit={submitNav} role="search">
+          <input
+            type="search"
+            bind:value={navQuery}
+            onfocus={() => {
+              if (navHits.length > 0 || navQuery.trim().length > 3) navOpen = true;
+            }}
+            placeholder="Rezept suchen…"
+            autocomplete="off"
+            inputmode="search"
+            aria-label="Suchbegriff"
+          />
+        </form>
+        {#if navOpen}
+          <div class="dropdown" role="listbox">
+            {#if navSearching && navHits.length === 0}
+              <p class="dd-status">Suche läuft …</p>
+            {:else if navHits.length > 0}
+              <ul class="dd-list">
+                {#each navHits as r (r.id)}
+                  <li>
+                    <a
+                      href={`/recipes/${r.id}`}
+                      class="dd-item"
+                      onclick={pickHit}
+                      role="option"
+                      aria-selected="false"
+                    >
+                      {#if r.image_path}
+                        <img src={`/images/${r.image_path}`} alt="" loading="lazy" />
+                      {:else}
+                        <div class="dd-placeholder">🥘</div>
+                      {/if}
+                      <div class="dd-body">
+                        <div class="dd-title">{r.title}</div>
+                        {#if r.source_domain}
+                          <div class="dd-domain">{r.source_domain}</div>
+                        {/if}
+                      </div>
+                    </a>
+                  </li>
+                {/each}
+              </ul>
+            {:else if navQuery.trim().length > 3 && !navSearching}
+              <p class="dd-status">Keine lokalen Treffer.</p>
+            {/if}
+            {#if navQuery.trim().length > 3 && !navSearching}
+              <a
+                class="dd-web"
+                href={`/search/web?q=${encodeURIComponent(navQuery.trim())}`}
+                onclick={pickHit}
+              >
+                🌐 Im Internet weitersuchen
+              </a>
+            {/if}
+          </div>
+        {/if}
+      </div>
+    {/if}
+    <div class="bar-right">
+      <a href="/wishlist" class="nav-link" aria-label="Wunschliste">🍽️</a>
+      <a href="/admin" class="nav-link" aria-label="Einstellungen">⚙️</a>
+      <ProfileSwitcher />
+    </div>
   </div>
 </header>
 
@@ -77,12 +180,16 @@
     position: sticky;
     top: 0;
     z-index: 10;
+    background: white;
+    border-bottom: 1px solid #e4eae7;
+  }
+  .bar-inner {
+    max-width: 760px;
+    margin: 0 auto;
     display: flex;
     align-items: center;
     gap: 0.6rem;
     padding: 0.6rem 1rem;
-    background: white;
-    border-bottom: 1px solid #e4eae7;
   }
   .brand {
     font-size: 1.15rem;
@@ -91,9 +198,12 @@
     color: #2b6a3d;
     flex-shrink: 0;
   }
-  .nav-search {
+  .nav-search-wrap {
+    position: relative;
     flex: 1;
     min-width: 0;
+  }
+  .nav-search {
     display: flex;
   }
   .nav-search input {
@@ -110,12 +220,113 @@
     outline-offset: 1px;
     background: white;
   }
+  .dropdown {
+    position: absolute;
+    top: calc(100% + 0.4rem);
+    left: 0;
+    right: 0;
+    background: white;
+    border: 1px solid #e4eae7;
+    border-radius: 12px;
+    box-shadow: 0 14px 40px rgba(0, 0, 0, 0.18);
+    max-height: 70vh;
+    overflow-y: auto;
+    z-index: 50;
+  }
+  .dd-list {
+    list-style: none;
+    padding: 0.35rem;
+    margin: 0;
+    display: flex;
+    flex-direction: column;
+    gap: 0.1rem;
+  }
+  .dd-item {
+    display: flex;
+    align-items: center;
+    gap: 0.65rem;
+    padding: 0.45rem 0.55rem;
+    text-decoration: none;
+    color: #1a1a1a;
+    border-radius: 10px;
+    min-height: 52px;
+  }
+  .dd-item:hover {
+    background: #f4f8f5;
+  }
+  .dd-item img,
+  .dd-placeholder {
+    width: 44px;
+    height: 44px;
+    object-fit: cover;
+    border-radius: 8px;
+    background: #eef3ef;
+    display: grid;
+    place-items: center;
+    font-size: 1.3rem;
+    flex-shrink: 0;
+  }
+  .dd-body {
+    min-width: 0;
+    flex: 1;
+  }
+  .dd-title {
+    font-weight: 600;
+    font-size: 0.95rem;
+    line-height: 1.25;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+  }
+  .dd-domain {
+    font-size: 0.78rem;
+    color: #888;
+    margin-top: 0.1rem;
+  }
+  .dd-status {
+    text-align: center;
+    color: #888;
+    padding: 0.9rem 0.6rem;
+    margin: 0;
+    font-size: 0.9rem;
+  }
+  .dd-web {
+    display: block;
+    padding: 0.75rem 0.85rem;
+    text-align: center;
+    border-top: 1px solid #e4eae7;
+    text-decoration: none;
+    color: #2b6a3d;
+    font-size: 0.95rem;
+    background: #fafdfb;
+  }
+  .dd-web:hover {
+    background: #eaf4ed;
+  }
   .bar-right {
     display: flex;
     align-items: center;
     gap: 0.4rem;
     flex-shrink: 0;
   }
+  .nav-link {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    width: 40px;
+    height: 40px;
+    border-radius: 999px;
+    text-decoration: none;
+    font-size: 1.15rem;
+  }
+  .nav-link:hover {
+    background: #f4f8f5;
+  }
+  main {
+    padding: 0 1rem 4rem;
+    max-width: 760px;
+    margin: 0 auto;
+  }
   @media (max-width: 520px) {
     .brand {
       font-size: 0;
@@ -139,22 +350,4 @@
       font-size: 1.05rem;
     }
   }
-  .nav-link {
-    display: inline-flex;
-    align-items: center;
-    justify-content: center;
-    width: 40px;
-    height: 40px;
-    border-radius: 999px;
-    text-decoration: none;
-    font-size: 1.15rem;
-  }
-  .nav-link:hover {
-    background: #f4f8f5;
-  }
-  main {
-    padding: 0 1rem 4rem;
-    max-width: 760px;
-    margin: 0 auto;
-  }
 </style>

src/routes/+page.svelte

@@ -1,23 +1,61 @@
 <script lang="ts">
   import { onMount } from 'svelte';
+  import { goto } from '$app/navigation';
   import type { SearchHit } from '$lib/server/recipes/search-local';
 
   let query = $state('');
   let recent = $state<SearchHit[]>([]);
+  let hits = $state<SearchHit[]>([]);
+  let searching = $state(false);
+  let searchedFor = $state<string | null>(null);
 
   onMount(async () => {
     const res = await fetch('/api/recipes/search');
     const body = await res.json();
     recent = body.hits;
   });
+
+  let debounceTimer: ReturnType<typeof setTimeout> | null = null;
+
+  $effect(() => {
+    const q = query.trim();
+    if (debounceTimer) clearTimeout(debounceTimer);
+    if (q.length <= 3) {
+      hits = [];
+      searchedFor = null;
+      searching = false;
+      return;
+    }
+    searching = true;
+    debounceTimer = setTimeout(async () => {
+      try {
+        const res = await fetch(`/api/recipes/search?q=${encodeURIComponent(q)}`);
+        const body = await res.json();
+        if (query.trim() === q) {
+          hits = body.hits;
+          searchedFor = q;
+        }
+      } finally {
+        if (query.trim() === q) searching = false;
+      }
+    }, 300);
+  });
+
+  function submit(e: SubmitEvent) {
+    e.preventDefault();
+    const q = query.trim();
+    if (!q) return;
+    void goto(`/search?q=${encodeURIComponent(q)}`);
+  }
+
+  const activeSearch = $derived(query.trim().length > 3);
 </script>
 
 <section class="hero">
   <h1>Kochwas</h1>
-  <form method="GET" action="/search">
+  <form onsubmit={submit}>
     <input
       type="search"
-      name="q"
       bind:value={query}
       placeholder="Rezept suchen…"
       autocomplete="off"
@@ -28,7 +66,40 @@
   </form>
 </section>
 
-{#if recent.length > 0}
+{#if activeSearch}
+  <section class="results">
+    {#if searching && hits.length === 0}
+      <p class="muted">Suche läuft …</p>
+    {:else if hits.length > 0}
+      <ul class="cards">
+        {#each hits as r (r.id)}
+          <li>
+            <a href={`/recipes/${r.id}`} class="card">
+              {#if r.image_path}
+                <img src={`/images/${r.image_path}`} alt="" loading="lazy" />
+              {:else}
+                <div class="placeholder">🥘</div>
+              {/if}
+              <div class="card-body">
+                <div class="title">{r.title}</div>
+                {#if r.source_domain}
+                  <div class="domain">{r.source_domain}</div>
+                {/if}
+              </div>
+            </a>
+          </li>
+        {/each}
+      </ul>
+    {:else if searchedFor === query.trim()}
+      <div class="no-local">
+        <p>Keine lokalen Rezepte für „{searchedFor}".</p>
+        <a class="web-btn" href={`/search/web?q=${encodeURIComponent(searchedFor)}`}>
+          🌐 Im Internet weitersuchen
+        </a>
+      </div>
+    {/if}
+  </section>
+{:else if recent.length > 0}
   <section class="recent">
     <h2>Zuletzt hinzugefügt</h2>
     <ul class="cards">
@@ -91,14 +162,20 @@
     min-height: 48px;
     cursor: pointer;
   }
+  .results,
   .recent {
-    margin-top: 2rem;
+    margin-top: 1.5rem;
   }
   .recent h2 {
     font-size: 1.05rem;
     color: #444;
     margin: 0 0 0.75rem;
   }
+  .muted {
+    color: #888;
+    text-align: center;
+    padding: 2rem 0;
+  }
   .cards {
     list-style: none;
     padding: 0;
@@ -143,4 +220,22 @@
     color: #888;
     margin-top: 0.25rem;
   }
+  .no-local {
+    text-align: center;
+    padding: 1.5rem 0;
+  }
+  .no-local p {
+    color: #666;
+    margin: 0 0 1rem;
+  }
+  .web-btn {
+    display: inline-block;
+    padding: 0.8rem 1.25rem;
+    background: #2b6a3d;
+    color: white;
+    text-decoration: none;
+    border-radius: 10px;
+    font-size: 1rem;
+    min-height: 48px;
+  }
 </style>