feat(search): auto web search when no local hits, offer link otherwise

Homepage (/):
- Keine lokalen Treffer → automatisch die Internet-Suche auslösen und
  die Ergebnisse als Karten unterhalb der Suche anzeigen.
- Mindestens ein lokaler Treffer → Karten zeigen + darunter ein
  dezenter Link "🌐 Im Internet weitersuchen" (geht zur /search/web
  Vollseite), keine automatische Internet-Suche.

Header-Dropdown (auf Rezept- und Vorschau-Seiten):
- Gleiche Logik: lokale Treffer oben + Fuß-Link; keine lokalen
  Treffer → Internet-Ergebnisse werden direkt im Dropdown angezeigt.
- Abschnittsüberschrift "Keine lokalen Rezepte – aus dem Internet:"
  trennt den Fallback visuell ab.

Race-Safety bleibt bestehen: Query-Vergleich vor jedem State-Write,
sodass spät ankommende Antworten keinen neueren Suchstand überschreiben.

src/routes/+layout.svelte

@@ -6,12 +6,16 @@
   import ProfileSwitcher from '$lib/components/ProfileSwitcher.svelte';
   import ConfirmDialog from '$lib/components/ConfirmDialog.svelte';
   import type { SearchHit } from '$lib/server/recipes/search-local';
+  import type { WebHit } from '$lib/server/search/searxng';
 
   let { children } = $props();
 
   let navQuery = $state('');
   let navHits = $state<SearchHit[]>([]);
+  let navWebHits = $state<WebHit[]>([]);
   let navSearching = $state(false);
+  let navWebSearching = $state(false);
+  let navWebError = $state<string | null>(null);
   let navOpen = $state(false);
   let navContainer: HTMLElement | undefined = $state();
   let debounceTimer: ReturnType<typeof setTimeout> | null = null;
@@ -25,17 +29,40 @@
     if (debounceTimer) clearTimeout(debounceTimer);
     if (q.length <= 3) {
       navHits = [];
+      navWebHits = [];
       navSearching = false;
+      navWebSearching = false;
+      navWebError = null;
       navOpen = false;
       return;
     }
     navSearching = true;
+    navWebHits = [];
+    navWebSearching = false;
+    navWebError = null;
     navOpen = true;
     debounceTimer = setTimeout(async () => {
       try {
         const res = await fetch(`/api/recipes/search?q=${encodeURIComponent(q)}`);
         const body = await res.json();
-        if (navQuery.trim() === q) navHits = body.hits;
+        if (navQuery.trim() !== q) return;
+        navHits = body.hits;
+        if (body.hits.length === 0) {
+          navWebSearching = true;
+          try {
+            const wres = await fetch(`/api/recipes/search/web?q=${encodeURIComponent(q)}`);
+            if (navQuery.trim() !== q) return;
+            if (!wres.ok) {
+              const err = await wres.json().catch(() => ({}));
+              navWebError = err.message ?? `HTTP ${wres.status}`;
+            } else {
+              const wbody = await wres.json();
+              navWebHits = wbody.hits;
+            }
+          } finally {
+            if (navQuery.trim() === q) navWebSearching = false;
+          }
+        }
       } finally {
         if (navQuery.trim() === q) navSearching = false;
       }
@@ -64,11 +91,13 @@
     navOpen = false;
     navQuery = '';
     navHits = [];
+    navWebHits = [];
   }
 
   afterNavigate(() => {
     navQuery = '';
     navHits = [];
+    navWebHits = [];
     navOpen = false;
   });
 
@@ -133,10 +162,6 @@
                   </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=${encodeURIComponent(navQuery.trim())}`}
@@ -144,6 +169,39 @@
               >
                 🌐 Im Internet weitersuchen
               </a>
+            {:else}
+              <p class="dd-section">Keine lokalen Rezepte – aus dem Internet:</p>
+              {#if navWebSearching}
+                <p class="dd-status">Suche im Internet läuft …</p>
+              {:else if navWebError}
+                <p class="dd-status dd-error">Internet-Suche zurzeit nicht möglich.</p>
+              {:else if navWebHits.length > 0}
+                <ul class="dd-list">
+                  {#each navWebHits as w (w.url)}
+                    <li>
+                      <a
+                        href={`/preview?url=${encodeURIComponent(w.url)}`}
+                        class="dd-item"
+                        onclick={pickHit}
+                        role="option"
+                        aria-selected="false"
+                      >
+                        {#if w.thumbnail}
+                          <img src={w.thumbnail} alt="" loading="lazy" />
+                        {:else}
+                          <div class="dd-placeholder">🍽️</div>
+                        {/if}
+                        <div class="dd-body">
+                          <div class="dd-title">{w.title}</div>
+                          <div class="dd-domain">{w.domain}</div>
+                        </div>
+                      </a>
+                    </li>
+                  {/each}
+                </ul>
+              {:else}
+                <p class="dd-status">Auch im Internet nichts gefunden.</p>
+              {/if}
             {/if}
           </div>
         {/if}
@@ -290,6 +348,18 @@
     margin: 0;
     font-size: 0.9rem;
   }
+  .dd-error {
+    color: #c53030;
+  }
+  .dd-section {
+    margin: 0;
+    padding: 0.6rem 0.85rem 0.3rem;
+    font-size: 0.8rem;
+    color: #888;
+    border-bottom: 1px solid #f0f3f1;
+    text-transform: uppercase;
+    letter-spacing: 0.03em;
+  }
   .dd-web {
     display: block;
     padding: 0.75rem 0.85rem;

src/routes/+page.svelte

@@ -2,11 +2,15 @@
   import { onMount } from 'svelte';
   import { goto } from '$app/navigation';
   import type { SearchHit } from '$lib/server/recipes/search-local';
+  import type { WebHit } from '$lib/server/search/searxng';
 
   let query = $state('');
   let recent = $state<SearchHit[]>([]);
   let hits = $state<SearchHit[]>([]);
+  let webHits = $state<WebHit[]>([]);
   let searching = $state(false);
+  let webSearching = $state(false);
+  let webError = $state<string | null>(null);
   let searchedFor = $state<string | null>(null);
 
   onMount(async () => {
@@ -22,18 +26,39 @@
     if (debounceTimer) clearTimeout(debounceTimer);
     if (q.length <= 3) {
       hits = [];
+      webHits = [];
       searchedFor = null;
       searching = false;
+      webSearching = false;
+      webError = null;
       return;
     }
     searching = true;
+    webHits = [];
+    webSearching = false;
+    webError = null;
     debounceTimer = setTimeout(async () => {
       try {
         const res = await fetch(`/api/recipes/search?q=${encodeURIComponent(q)}`);
         const body = await res.json();
-        if (query.trim() === q) {
-          hits = body.hits;
-          searchedFor = q;
+        if (query.trim() !== q) return;
+        hits = body.hits;
+        searchedFor = q;
+        if (body.hits.length === 0) {
+          webSearching = true;
+          try {
+            const wres = await fetch(`/api/recipes/search/web?q=${encodeURIComponent(q)}`);
+            if (query.trim() !== q) return;
+            if (!wres.ok) {
+              const err = await wres.json().catch(() => ({}));
+              webError = err.message ?? `HTTP ${wres.status}`;
+            } else {
+              const wbody = await wres.json();
+              webHits = wbody.hits;
+            }
+          } finally {
+            if (query.trim() === q) webSearching = false;
+          }
         }
       } finally {
         if (query.trim() === q) searching = false;
@@ -90,13 +115,36 @@
           </li>
         {/each}
       </ul>
+      <a class="web-more" href={`/search/web?q=${encodeURIComponent(query.trim())}`}>
+        🌐 Im Internet weitersuchen
+      </a>
     {:else if searchedFor === query.trim()}
-      <div class="no-local">
-        <p>Keine lokalen Rezepte für „{searchedFor}".</p>
-        <a class="web-btn" href={`/search/web?q=${encodeURIComponent(searchedFor)}`}>
-          🌐 Im Internet weitersuchen
-        </a>
-      </div>
+      <p class="muted no-local-msg">Keine lokalen Rezepte für „{searchedFor}" — Ergebnisse aus dem Internet:</p>
+      {#if webSearching}
+        <p class="muted">Suche im Internet läuft …</p>
+      {:else if webError}
+        <p class="error">Internet-Suche zurzeit nicht möglich: {webError}</p>
+      {:else if webHits.length > 0}
+        <ul class="cards">
+          {#each webHits as w (w.url)}
+            <li>
+              <a class="card" href={`/preview?url=${encodeURIComponent(w.url)}`}>
+                {#if w.thumbnail}
+                  <img src={w.thumbnail} alt="" loading="lazy" />
+                {:else}
+                  <div class="placeholder">🍽️</div>
+                {/if}
+                <div class="card-body">
+                  <div class="title">{w.title}</div>
+                  <div class="domain">{w.domain}</div>
+                </div>
+              </a>
+            </li>
+          {/each}
+        </ul>
+      {:else}
+        <p class="muted">Auch im Internet nichts gefunden.</p>
+      {/if}
     {/if}
   </section>
 {:else if recent.length > 0}
@@ -174,7 +222,16 @@
   .muted {
     color: #888;
     text-align: center;
-    padding: 2rem 0;
+    padding: 1rem 0;
+  }
+  .no-local-msg {
+    font-size: 0.95rem;
+    padding: 0.25rem 0 1rem;
+  }
+  .error {
+    color: #c53030;
+    text-align: center;
+    padding: 1rem 0;
   }
   .cards {
     list-style: none;
@@ -220,22 +277,18 @@
     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 {
+  .web-more {
     display: inline-block;
-    padding: 0.8rem 1.25rem;
-    background: #2b6a3d;
-    color: white;
-    text-decoration: none;
+    margin-top: 1rem;
+    padding: 0.7rem 1.1rem;
+    border: 1px solid #b7d6c2;
     border-radius: 10px;
-    font-size: 1rem;
-    min-height: 48px;
+    text-decoration: none;
+    color: #2b6a3d;
+    background: #eaf4ed;
+    font-size: 0.95rem;
+  }
+  .web-more:hover {
+    background: #d8e8df;
   }
 </style>