feat(inventory): inline site selector above items table

Items page now fetches all active sites and passes them alongside
preferredSiteId to ItemsTable. A "Working Site" row appears at the
top of the table — selecting a site calls setPreferredSite, revalidates
the page, and shows distances in the vendor sub-rows. A status hint
("Distances shown from selected site") appears when a site is active;
"No site selected — distances hidden" is the empty-state label.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

App/pelagia-portal/app/(portal)/inventory/items/items-table.tsx

@@ -1,9 +1,10 @@
 "use client";
 
-import { useState, useMemo } from "react";
+import { useState, useMemo, useTransition } from "react";
 import { Search, X, ChevronDown, ChevronRight, MapPin, Tag } from "lucide-react";
 import { formatCurrency } from "@/lib/utils";
 import { addToCart } from "@/lib/cart";
+import { setPreferredSite } from "@/app/actions/site-preference";
 
 type VendorOption = {
   vendorId: string;
@@ -25,11 +26,24 @@ function formatDist(km: number) {
   return km < 1 ? `${Math.round(km * 1000)} m` : `${km.toFixed(0)} km`;
 }
 
-export function ItemsTable({ items, hasSite }: { items: CatalogItem[]; hasSite: boolean }) {
+type SiteOption = { id: string; name: string; code: string };
+
+export function ItemsTable({
+  items,
+  hasSite,
+  sites = [],
+  preferredSiteId = null,
+}: {
+  items: CatalogItem[];
+  hasSite: boolean;
+  sites?: SiteOption[];
+  preferredSiteId?: string | null;
+}) {
   const [query, setQuery] = useState("");
   const [expandedId, setExpandedId] = useState<string | null>(null);
   const [sortBy, setSortBy] = useState<"distance" | "price">(hasSite ? "distance" : "price");
   const [added, setAdded] = useState<Record<string, boolean>>({});
+  const [sitePending, startSiteTransition] = useTransition();
 
   const filtered = useMemo(() => {
     const q = query.toLowerCase().trim();
@@ -79,6 +93,31 @@ export function ItemsTable({ items, hasSite }: { items: CatalogItem[]; hasSite:
 
   return (
     <div className="space-y-3">
+      {/* Site selector */}
+      {sites.length > 0 && (
+        <div className="flex items-center gap-3 rounded-lg border border-neutral-200 bg-white px-4 py-3">
+          <MapPin className="h-4 w-4 text-neutral-400 shrink-0" />
+          <label className="text-sm font-medium text-neutral-700 whitespace-nowrap">Working Site</label>
+          <select
+            value={preferredSiteId ?? ""}
+            disabled={sitePending}
+            onChange={(e) =>
+              startSiteTransition(() => setPreferredSite(e.target.value || null))
+            }
+            className="flex-1 max-w-xs rounded-lg border border-neutral-200 bg-neutral-50 px-3 py-1.5 text-sm text-neutral-700 focus:border-primary-500 focus:outline-none focus:ring-2 focus:ring-primary-500/20 disabled:opacity-60"
+          >
+            <option value="">No site selected — distances hidden</option>
+            {sites.map((s) => (
+              <option key={s.id} value={s.id}>{s.name} ({s.code})</option>
+            ))}
+          </select>
+          {sitePending && <span className="text-xs text-neutral-400">Updating…</span>}
+          {!sitePending && preferredSiteId && (
+            <span className="text-xs text-primary-600">Distances shown from selected site</span>
+          )}
+        </div>
+      )}
+
       {/* Toolbar */}
       <div className="flex items-center gap-3">
         <div className="relative flex-1 max-w-sm">

App/pelagia-portal/app/(portal)/inventory/items/page.tsx

@@ -11,7 +11,7 @@ export default async function InventoryItemsPage() {
   const session = await auth();
   if (!session?.user) redirect("/login");
 
-  const [user, products] = await Promise.all([
+  const [user, products, sites] = await Promise.all([
     db.user.findUnique({
       where: { id: session.user.id },
       include: {
@@ -33,6 +33,11 @@ export default async function InventoryItemsPage() {
       },
       orderBy: { name: "asc" },
     }),
+    db.site.findMany({
+      where: { isActive: true },
+      orderBy: { name: "asc" },
+      select: { id: true, name: true, code: true },
+    }),
   ]);
 
   const site = user?.preferredSite ?? null;
@@ -61,16 +66,14 @@ export default async function InventoryItemsPage() {
     <div className="max-w-6xl">
       <div className="mb-6">
         <h1 className="text-2xl font-semibold text-neutral-900">Browse Items</h1>
-        <p className="mt-1 text-sm text-neutral-500">
+        <p className="mt-1 text-sm text-neutral-500">Search the catalogue and add items to your cart.</p>
-          Search the catalogue and add items to your cart.
-          {site ? (
-            <span className="ml-1 text-primary-600">Distances shown from {site.name}.</span>
-          ) : (
-            <span className="ml-1 text-neutral-400">Select a site in the header to enable distance sorting.</span>
-          )}
-        </p>
       </div>
-      <ItemsTable items={items} hasSite={!!site} />
+      <ItemsTable
+        items={items}
+        hasSite={!!site}
+        sites={sites}
+        preferredSiteId={user?.preferredSiteId ?? null}
+      />
     </div>
   );
 }