Einzelstueck-Liste: Web-Seite /items + iOS-Liste (filterbar nach Lagerort)

Neue Seite 'Einzelstuecke' (Web, /items, in der Sidebar) listet alle physischen Exemplare ueber alle Produkte in der DataTable - je Spalte filterbar (Lagerort als Pfad, Produkt, Kategorie, Shop, ...), Lagerort und Shop inline aenderbar. iOS bekommt dieselbe Liste als schlichte, filterbare Ansicht (Kachel unter 'Listen'): Suche + Lagerort-/Kategorie-Filter, Tippen oeffnet das Einzelstueck. Item-Model/ItemOut um Kategorie ergaenzt; neuer APIClient.allItems().

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/src/pages/ItemList.jsx

@@ -0,0 +1,97 @@
+import { useEffect, useState } from "react";
+import { Link } from "react-router-dom";
+import { api } from "../api";
+import { useAuth } from "../auth";
+import Icon from "../components/Icon";
+import DataTable from "../components/DataTable";
+import { ProduktThumb } from "../components/ProduktBild";
+import { locationOptions, locationPathById } from "../locationPath";
+
+/**
+ * Liste aller Einzelstücke (physische Exemplare, jedes mit eigener UID/Lagerort) –
+ * anders als „Produkte", das nur die Katalog-Typen zeigt. Über die DataTable je
+ * Spalte filterbar, u.a. nach Lagerort. Lagerort und Shop sind inline änderbar.
+ */
+export default function ItemList() {
+  const { isAdmin } = useAuth();
+  const [items, setItems] = useState([]);
+  const [locations, setLocations] = useState([]);
+  const [shops, setShops] = useState([]);
+  const [error, setError] = useState(null);
+
+  async function load() {
+    try {
+      const [is, ls, ss] = await Promise.all([
+        api.listAllItems(), api.listLocations(), api.listShops(),
+      ]);
+      setItems(is); setLocations(ls); setShops(ss);
+    } catch (err) { setError(err.message); }
+  }
+  useEffect(() => { load(); }, []);
+
+  async function patch(it, body) {
+    try { await api.updateItem(it.id, body); await load(); }
+    catch (err) { setError(err.message); }
+  }
+
+  const preis = (it) => (it.price_cents != null
+    ? `${(it.price_cents / 100).toFixed(2)} ${it.currency || ""}`.trim() : "");
+
+  const columns = [
+    { key: "thumb", header: "", fixed: true, width: 56,
+      render: (it) => <ProduktThumb productId={it.product_id} alt={it.product_name} /> },
+    { key: "uid", header: "UID", width: 110, filterText: (it) => it.uid, sortValue: (it) => it.uid,
+      render: (it) => <span className="strong nowrap">{it.uid}</span> },
+    { key: "product", header: "Produkt", grow: true, min: 180,
+      filterText: (it) => it.product_name || "", sortValue: (it) => it.product_name || "",
+      render: (it) => it.product_name || "–" },
+    { key: "brand", header: "Marke", width: 140, filterText: (it) => it.product_brand || "",
+      render: (it) => <span className="muted">{it.product_brand || "–"}</span> },
+    { key: "category", header: "Kategorie", width: 160, filterText: (it) => it.category_name || "",
+      render: (it) => <span className="muted">{it.category_name || "–"}</span> },
+    { key: "location", header: "Lagerort", width: 220,
+      filterText: (it) => locationPathById(it.location_id, locations),
+      render: (it) => (isAdmin ? (
+        <select value={it.location_id ?? ""} style={{ marginTop: 0 }}
+          onChange={(e) => patch(it, { location_id: e.target.value === "" ? null : e.target.value })}>
+          <option value="">– ohne –</option>
+          {locationOptions(locations).map((o) => <option key={o.id} value={o.id}>{o.label}</option>)}
+        </select>
+      ) : (locationPathById(it.location_id, locations) || "–")) },
+    { key: "shop", header: "Gekauft bei", width: 150, filterText: (it) => it.shop_name || "",
+      render: (it) => (isAdmin ? (
+        <select value={it.shop_id ?? ""} style={{ marginTop: 0 }}
+          onChange={(e) => patch(it, { shop_id: e.target.value === "" ? null : Number(e.target.value) })}>
+          <option value="">– unbekannt –</option>
+          {shops.map((s) => <option key={s.id} value={s.id}>{s.name}</option>)}
+        </select>
+      ) : (it.shop_name || "–")) },
+    { key: "acquired", header: "Gekauft am", width: 120, filterText: (it) => it.acquired_on || "",
+      sortValue: (it) => it.acquired_on || "", render: (it) => it.acquired_on || "–" },
+    { key: "warranty", header: "Garantie bis", width: 120, filterText: (it) => it.warranty_until || "",
+      sortValue: (it) => it.warranty_until || "", render: (it) => it.warranty_until || "–" },
+    { key: "price", header: "Preis", width: 110, align: "num",
+      sortValue: (it) => it.price_cents ?? -1, filterText: preis,
+      render: (it) => preis(it) || "–" },
+    { key: "note", header: "Notiz", width: 160, filterText: (it) => it.note || "",
+      render: (it) => <span className="muted">{it.note || "–"}</span> },
+    { key: "open", header: "", fixed: true, width: 84, align: "num",
+      render: (it) => <Link to={`/products/${it.product_id}`}>Produkt</Link> },
+  ];
+
+  return (
+    <div>
+      <div className="page-head">
+        <div>
+          <h1>Einzelstücke</h1>
+          <div className="sub">{items.length} Exemplare · nach Lagerort, Produkt, Kategorie u.a. filterbar</div>
+        </div>
+      </div>
+      {error && <div className="alert error"><Icon name="alert" size={16} />{error}</div>}
+      <div className="card">
+        <DataTable id="items" columns={columns} rows={items}
+          getRowKey={(it) => it.id} empty="Noch keine Einzelstücke." />
+      </div>
+    </div>
+  );
+}