feat(header-search): „+ weitere Ergebnisse" lädt inline im Dropdown

Vorher war der „+ weitere"-Link im Header-Dropdown ein Navigations-Link
auf /?q=. Jetzt blättert der Button stattdessen im offenen Dropdown
direkt nach — erst weitere lokale Treffer, dann (wenn lokal erschöpft)
SearXNG-Seiten. Lokale und Web-Treffer werden beide im Dropdown
angezeigt, getrennt durch „Aus dem Internet"-Zwischenüberschrift.

Identische Logik wie auf der Home-Seite, nur im Dropdown-Scope. Dedup
per ID (lokal) bzw. URL (web) gegen SearXNG-Doppler.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/routes/+layout.svelte

@@ -15,6 +15,8 @@
 
   let { children } = $props();
 
+  const NAV_PAGE_SIZE = 30;
+
   let navQuery = $state('');
   let navHits = $state<SearchHit[]>([]);
   let navWebHits = $state<WebHit[]>([]);
@@ -22,6 +24,10 @@
   let navWebSearching = $state(false);
   let navWebError = $state<string | null>(null);
   let navOpen = $state(false);
+  let navLocalExhausted = $state(false);
+  let navWebPageno = $state(0);
+  let navWebExhausted = $state(false);
+  let navLoadingMore = $state(false);
   let navContainer: HTMLElement | undefined = $state();
   let debounceTimer: ReturnType<typeof setTimeout> | null = null;
   let menuOpen = $state(false);
@@ -41,6 +47,9 @@
       navWebSearching = false;
       navWebError = null;
       navOpen = false;
+      navLocalExhausted = false;
+      navWebPageno = 0;
+      navWebExhausted = false;
       return;
     }
     navSearching = true;
@@ -48,23 +57,34 @@
     navWebSearching = false;
     navWebError = null;
     navOpen = true;
+    navLocalExhausted = false;
+    navWebPageno = 0;
+    navWebExhausted = false;
     debounceTimer = setTimeout(async () => {
       try {
-        const res = await fetch(`/api/recipes/search?q=${encodeURIComponent(q)}`);
+        const res = await fetch(
+          `/api/recipes/search?q=${encodeURIComponent(q)}&limit=${NAV_PAGE_SIZE}`
+        );
         const body = await res.json();
         if (navQuery.trim() !== q) return;
         navHits = body.hits;
-        if (body.hits.length === 0) {
+        if (navHits.length < NAV_PAGE_SIZE) navLocalExhausted = true;
+        if (navHits.length === 0) {
           navWebSearching = true;
           try {
-            const wres = await fetch(`/api/recipes/search/web?q=${encodeURIComponent(q)}`);
+            const wres = await fetch(
+              `/api/recipes/search/web?q=${encodeURIComponent(q)}&pageno=1`
+            );
             if (navQuery.trim() !== q) return;
             if (!wres.ok) {
               const err = await wres.json().catch(() => ({}));
               navWebError = err.message ?? `HTTP ${wres.status}`;
+              navWebExhausted = true;
             } else {
               const wbody = await wres.json();
               navWebHits = wbody.hits;
+              navWebPageno = 1;
+              if (navWebHits.length === 0) navWebExhausted = true;
             }
           } finally {
             if (navQuery.trim() === q) navWebSearching = false;
@@ -76,6 +96,56 @@
     }, 300);
   });
 
+  async function loadMoreNav() {
+    if (navLoadingMore) return;
+    const q = navQuery.trim();
+    if (!q) return;
+    navLoadingMore = true;
+    try {
+      if (!navLocalExhausted) {
+        const res = await fetch(
+          `/api/recipes/search?q=${encodeURIComponent(q)}&limit=${NAV_PAGE_SIZE}&offset=${navHits.length}`
+        );
+        const body = await res.json();
+        if (navQuery.trim() !== q) return;
+        const more = body.hits as SearchHit[];
+        const seen = new Set(navHits.map((h) => h.id));
+        const deduped = more.filter((h) => !seen.has(h.id));
+        navHits = [...navHits, ...deduped];
+        if (more.length < NAV_PAGE_SIZE) navLocalExhausted = true;
+      } else if (!navWebExhausted) {
+        const nextPage = navWebPageno + 1;
+        navWebSearching = navWebHits.length === 0;
+        try {
+          const wres = await fetch(
+            `/api/recipes/search/web?q=${encodeURIComponent(q)}&pageno=${nextPage}`
+          );
+          if (navQuery.trim() !== q) return;
+          if (!wres.ok) {
+            const err = await wres.json().catch(() => ({}));
+            navWebError = err.message ?? `HTTP ${wres.status}`;
+            navWebExhausted = true;
+            return;
+          }
+          const wbody = await wres.json();
+          const more = wbody.hits as WebHit[];
+          const seen = new Set(navWebHits.map((h) => h.url));
+          const deduped = more.filter((h) => !seen.has(h.url));
+          if (deduped.length === 0) {
+            navWebExhausted = true;
+          } else {
+            navWebHits = [...navWebHits, ...deduped];
+            navWebPageno = nextPage;
+          }
+        } finally {
+          if (navQuery.trim() === q) navWebSearching = false;
+        }
+      }
+    } finally {
+      navLoadingMore = false;
+    }
+  }
+
   function submitNav(e: SubmitEvent) {
     e.preventDefault();
     const q = navQuery.trim();
@@ -156,48 +226,43 @@
         </form>
         {#if navOpen}
           <div class="dropdown" role="listbox">
-            {#if navSearching && navHits.length === 0}
+            {#if navSearching && navHits.length === 0 && navWebHits.length === 0}
               <SearchLoader scope="local" size="sm" />
-            {:else if navHits.length > 0}
-              <ul class="dd-list">
-                {#each navHits as r (r.id)}
-                  <li>
-                    <a
-                      href={`/recipes/${r.id}`}
-                      class="dd-item"
-                      onclick={pickHit}
-                      role="option"
-                      aria-selected="false"
-                    >
-                      {#if r.image_path}
-                        <img src={`/images/${r.image_path}`} alt="" loading="lazy" />
-                      {:else}
-                        <div class="dd-placeholder"><CookingPot size={22} /></div>
-                      {/if}
-                      <div class="dd-body">
-                        <div class="dd-title">{r.title}</div>
-                        {#if r.source_domain}
-                          <div class="dd-domain">{r.source_domain}</div>
-                        {/if}
-                      </div>
-                    </a>
-                  </li>
-                {/each}
-              </ul>
-              <a
-                class="dd-web"
-                href={`/?q=${encodeURIComponent(navQuery.trim())}`}
-                onclick={pickHit}
-              >
-                <span>+ weitere Ergebnisse</span>
-              </a>
             {:else}
-              <p class="dd-section">Keine lokalen Rezepte – aus dem Internet:</p>
-              {#if navWebSearching}
-                <SearchLoader scope="web" size="sm" />
-              {:else if navWebError}
-                <p class="dd-status dd-error">Internet-Suche zurzeit nicht möglich.</p>
-              {:else if navWebHits.length > 0}
+              {#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"><CookingPot size={22} /></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>
+              {/if}
+
+              {#if navWebHits.length > 0}
+                {#if navHits.length > 0}
+                  <p class="dd-section">Aus dem Internet</p>
+                {:else}
+                  <p class="dd-section">Keine lokalen Rezepte – aus dem Internet:</p>
+                {/if}
                 <ul class="dd-list">
                   {#each navWebHits as w (w.url)}
                     <li>
@@ -221,16 +286,30 @@
                     </li>
                   {/each}
                 </ul>
-                <a
-                  class="dd-web"
-                  href={`/?q=${encodeURIComponent(navQuery.trim())}`}
-                  onclick={pickHit}
-                >
-                  <span>+ weitere Ergebnisse</span>
-                </a>
-              {:else}
+              {/if}
+
+              {#if navWebSearching}
+                <SearchLoader scope="web" size="sm" />
+              {:else if navWebError && navWebHits.length === 0}
+                <p class="dd-status dd-error">Internet-Suche zurzeit nicht möglich.</p>
+              {:else if navHits.length === 0 && navWebHits.length === 0 && !navSearching}
                 <p class="dd-status">Auch im Internet nichts gefunden.</p>
               {/if}
+
+              {#if !(navLocalExhausted && navWebExhausted) && (navHits.length > 0 || navWebHits.length > 0)}
+                <button
+                  class="dd-web"
+                  type="button"
+                  onclick={loadMoreNav}
+                  disabled={navLoadingMore || navWebSearching}
+                >
+                  <span
+                    >{navLoadingMore || navWebSearching
+                      ? 'Lade …'
+                      : '+ weitere Ergebnisse'}</span
+                  >
+                </button>
+              {/if}
             {/if}
           </div>
         {/if}
@@ -429,15 +508,23 @@
     justify-content: center;
     gap: 0.4rem;
     padding: 0.75rem 0.85rem;
+    border: 0;
     border-top: 1px solid #e4eae7;
     text-decoration: none;
     color: #2b6a3d;
     font-size: 0.95rem;
     background: #fafdfb;
+    width: 100%;
+    cursor: pointer;
+    font-family: inherit;
   }
-  .dd-web:hover {
+  .dd-web:hover:not(:disabled) {
     background: #eaf4ed;
   }
+  .dd-web:disabled {
+    opacity: 0.6;
+    cursor: progress;
+  }
   .bar-right {
     display: flex;
     align-items: center;