Add instant-search overlay (products + blog posts)

Separate commit on purpose so this can be reverted independently if
needed. Search icon in the Navbar (hidden below sm:, same reasoning
as WishlistLink — Account+Cart are the only always-visible icons on
true mobile) opens a debounced (250ms) overlay searching both
collections at once via a new /api/search route.

Plain Payload `where[...][contains]` queries (Postgres ILIKE), not a
real search index (Meilisearch/Algolia) — matches the catalog's
current small size, see [[project-ecommerce-sota-gaps]]'s own "search
becomes necessary past ~20 products" note. Worth upgrading later
without touching the overlay component itself.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/api/search/route.ts

@@ -0,0 +1,76 @@
+import { NextResponse } from "next/server";
+
+const PAYLOAD_URL = process.env.PAYLOAD_URL || "https://payload.mk360.de";
+const TENANT_SLUG = "einfach-produktiv";
+
+export type SearchResult = {
+  type: "product" | "post";
+  id: string;
+  title: string;
+  href: string;
+  thumbnail: string | null;
+};
+
+// Lightweight instant search — plain `where[...][contains]` queries
+// against Payload (Postgres ILIKE under the hood) rather than a real
+// search index (Meilisearch/Algolia). Fine at this catalog size (a
+// handful of products + blog posts, see [[project-ecommerce-sota-gaps]]'s
+// own "search becomes necessary past ~20 products" note) — worth
+// upgrading only once the catalog actually grows into that range, this
+// route can be swapped out later without touching the frontend overlay.
+export async function GET(request: Request) {
+  const { searchParams } = new URL(request.url);
+  const q = searchParams.get("q")?.trim() ?? "";
+  if (q.length < 2) return NextResponse.json({ results: [] });
+
+  const productParams = new URLSearchParams({
+    "where[tenant.slug][equals]": TENANT_SLUG,
+    "where[active][equals]": "true",
+    "where[name][contains]": q,
+    depth: "1",
+    limit: "6",
+  });
+  const postParams = new URLSearchParams({
+    "where[tenant.slug][equals]": TENANT_SLUG,
+    "where[status][equals]": "published",
+    "where[title][contains]": q,
+    depth: "1",
+    limit: "6",
+  });
+
+  const [productsRes, postsRes] = await Promise.all([
+    fetch(`${PAYLOAD_URL}/api/products?${productParams}`, { next: { revalidate: 30 } }),
+    fetch(`${PAYLOAD_URL}/api/posts?${postParams}`, { next: { revalidate: 30 } }),
+  ]);
+
+  const results: SearchResult[] = [];
+
+  if (productsRes.ok) {
+    const data: { docs?: { id: number; slug: string; name: string; detailHref: string | null; image: { url: string } | number | null }[] } =
+      await productsRes.json();
+    for (const doc of data.docs ?? []) {
+      results.push({
+        type: "product",
+        id: `product-${doc.id}`,
+        title: doc.name,
+        href: doc.detailHref || "/shop",
+        thumbnail: typeof doc.image === "object" && doc.image ? doc.image.url : null,
+      });
+    }
+  }
+
+  if (postsRes.ok) {
+    const data: { docs?: { id: number; slug: string; title: string; thumbnail: { url: string } | number | null }[] } = await postsRes.json();
+    for (const doc of data.docs ?? []) {
+      results.push({
+        type: "post",
+        id: `post-${doc.id}`,
+        title: doc.title,
+        href: `/blog/${doc.slug}`,
+        thumbnail: typeof doc.thumbnail === "object" && doc.thumbnail ? doc.thumbnail.url : null,
+      });
+    }
+  }
+
+  return NextResponse.json({ results });
+}

app/components/Navbar.tsx

@@ -7,6 +7,7 @@ import { usePathname } from "next/navigation";
 import { AnimatePresence, motion } from "motion/react";
 import { useCartCount } from "../lib/cart";
 import { useWishlist } from "../lib/useWishlist";
+import { SearchButton } from "./SearchOverlay";
 import { AUTH_CHANGED_EVENT } from "../lib/auth";
 import { NewsletterModal } from "./NewsletterModal";
 import { useCartFly } from "./CartFly";
@@ -544,6 +545,7 @@ export function Navbar({ singleActiveProduct, wishlistEnabled }: { singleActiveP
                 built-in padding read as too much space on mobile, where
                 these two icons are the only always-visible controls. */}
             <div className="flex items-center">
+              <SearchButton />
               <AccountLink />
               {wishlistEnabled && <WishlistLink />}
               <CartLink />

app/components/SearchOverlay.tsx

@@ -0,0 +1,144 @@
+"use client";
+
+import { useEffect, useRef, useState } from "react";
+import Link from "next/link";
+import Image from "next/image";
+import type { SearchResult } from "../api/search/route";
+
+const DEBOUNCE_MS = 250;
+
+export function SearchButton() {
+  const [open, setOpen] = useState(false);
+
+  useEffect(() => {
+    if (!open) return;
+    function onKeyDown(e: KeyboardEvent) {
+      if (e.key === "Escape") setOpen(false);
+    }
+    document.addEventListener("keydown", onKeyDown);
+    document.body.style.overflow = "hidden";
+    return () => {
+      document.removeEventListener("keydown", onKeyDown);
+      document.body.style.overflow = "";
+    };
+  }, [open]);
+
+  return (
+    <>
+      {/* hidden sm: — same reasoning as Navbar's WishlistLink: Account+Cart
+          are the only always-visible icons on true mobile, a 3rd icon
+          there risks the same computed nav-overflow class of bug the
+          figma-to-nextjs skill documents. sm+ has real room to spare. */}
+      <button
+        type="button"
+        onClick={() => setOpen(true)}
+        aria-label="Suche öffnen"
+        className="hidden sm:flex h-11 w-11 items-center justify-center shrink-0 active:scale-[0.9] transition-transform"
+      >
+        <svg viewBox="0 0 24 24" className="h-6 w-6 text-text-primary" fill="none" aria-hidden="true">
+          <circle cx="11" cy="11" r="7" stroke="currentColor" strokeWidth="1.8" />
+          <path d="M20 20L16.5 16.5" stroke="currentColor" strokeWidth="1.8" strokeLinecap="round" />
+        </svg>
+      </button>
+      {open && <SearchOverlay onClose={() => setOpen(false)} />}
+    </>
+  );
+}
+
+function SearchOverlay({ onClose }: { onClose: () => void }) {
+  const [query, setQuery] = useState("");
+  const [results, setResults] = useState<SearchResult[]>([]);
+  const [loading, setLoading] = useState(false);
+  const inputRef = useRef<HTMLInputElement>(null);
+  const debounceRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+
+  useEffect(() => {
+    inputRef.current?.focus();
+  }, []);
+
+  useEffect(() => {
+    if (debounceRef.current) clearTimeout(debounceRef.current);
+    if (query.trim().length < 2) {
+      setResults([]);
+      setLoading(false);
+      return;
+    }
+    setLoading(true);
+    debounceRef.current = setTimeout(async () => {
+      const res = await fetch(`/api/search?q=${encodeURIComponent(query.trim())}`, { cache: "no-store" });
+      const data: { results?: SearchResult[] } = await res.json().catch(() => ({ results: [] }));
+      setResults(data.results ?? []);
+      setLoading(false);
+    }, DEBOUNCE_MS);
+    return () => {
+      if (debounceRef.current) clearTimeout(debounceRef.current);
+    };
+  }, [query]);
+
+  const products = results.filter((r) => r.type === "product");
+  const posts = results.filter((r) => r.type === "post");
+
+  return (
+    <div className="fixed inset-0 z-[100] flex flex-col items-center bg-bg-base/95 backdrop-blur-sm pt-[15vh] px-[var(--layout-padding-x)]" onClick={onClose}>
+      <div className="w-full max-w-[36rem]" onClick={(e) => e.stopPropagation()}>
+        <div className="flex items-center gap-3 border-b-2 border-border focus-within:border-brand transition-colors pb-3">
+          <svg viewBox="0 0 24 24" className="h-6 w-6 text-text-muted shrink-0" fill="none" aria-hidden="true">
+            <circle cx="11" cy="11" r="7" stroke="currentColor" strokeWidth="1.8" />
+            <path d="M20 20L16.5 16.5" stroke="currentColor" strokeWidth="1.8" strokeLinecap="round" />
+          </svg>
+          <input
+            ref={inputRef}
+            type="text"
+            value={query}
+            onChange={(e) => setQuery(e.target.value)}
+            placeholder="Produkte, Blogbeiträge…"
+            className="flex-1 min-w-0 bg-transparent outline-none text-h4 text-text-primary placeholder:text-text-muted"
+          />
+          <button type="button" onClick={onClose} aria-label="Suche schließen" className="shrink-0 text-body-sm text-text-muted hover:text-brand transition-colors">
+            Esc
+          </button>
+        </div>
+
+        <div className="mt-6 flex flex-col gap-6 max-h-[55vh] overflow-y-auto">
+          {loading && <p className="text-body-sm text-text-muted">Suche…</p>}
+          {!loading && query.trim().length >= 2 && results.length === 0 && (
+            <p className="text-body-sm text-text-muted">Keine Treffer für „{query}“.</p>
+          )}
+
+          {products.length > 0 && (
+            <div className="flex flex-col gap-2">
+              <p className="text-label font-bold text-text-muted uppercase tracking-wide">Produkte</p>
+              {products.map((r) => (
+                <SearchResultRow key={r.id} result={r} onClose={onClose} />
+              ))}
+            </div>
+          )}
+
+          {posts.length > 0 && (
+            <div className="flex flex-col gap-2">
+              <p className="text-label font-bold text-text-muted uppercase tracking-wide">Blog</p>
+              {posts.map((r) => (
+                <SearchResultRow key={r.id} result={r} onClose={onClose} />
+              ))}
+            </div>
+          )}
+        </div>
+      </div>
+    </div>
+  );
+}
+
+function SearchResultRow({ result, onClose }: { result: SearchResult; onClose: () => void }) {
+  return (
+    <Link
+      href={result.href}
+      onClick={onClose}
+      className="flex items-center gap-3 p-2 rounded-sm hover:bg-bg-muted transition-colors"
+    >
+      <div className="relative h-12 w-12 shrink-0 rounded-sm overflow-hidden bg-bg-muted">
+        {result.thumbnail && <Image alt="" src={result.thumbnail} fill sizes="48px" className="object-cover" />}
+      </div>
+      <span className="text-body text-text-primary">{result.title}</span>
+    </Link>
+  );
+}