feat(desktop-header): surface "ورود به فروشگاه من" CTA for sellers and staff

Mobile profile page already has this action, but the desktop chrome had
no way for a seller or staff member to jump into a store they manage —
they'd have to type the URL. Add a compact "فروشگاه من" pill in the
header action row, gated on useMyStores() so it only renders for users
who actually manage a store. Selection mirrors the mobile flow: owned
first, then the first store they staff.

app/components/desktop/DesktopHeader.tsx

@@ -3,6 +3,7 @@ import { useState, useRef, useEffect, type FormEvent } from "react";
 import { Search, Heart, ShoppingBag, User, Store } from "lucide-react";
 import { useRootData } from "~/hooks/use-root-data";
 import { useCartCount } from "~/requestHandler/use-cart-hooks";
+import { useMyStores } from "~/requestHandler/use-seller-hooks";
 import { useSearchAutocomplete } from "~/requestHandler/use-search-hooks";
 import { useDebounce } from "~/hooks/useDebounce";
 import { SunMoonToggle } from "~/components/SunMoonToggle";
@@ -25,6 +26,12 @@ const DesktopHeader = () => {
   const navigate = useNavigate();
   const { user, theme } = useRootData();
   const cartCount = useCartCount();
+  const { data: myStores } = useMyStores();
+  // Mirror the mobile "ورود به فروشگاه من" flow: prefer a store the user owns,
+  // fall back to the first store they staff. If they don't manage any store,
+  // the CTA is hidden.
+  const targetStore =
+    myStores?.find((s) => s.role === "owner") ?? myStores?.[0];
   const [q, setQ] = useState("");
   const [open, setOpen] = useState(false);
   const searchRef = useRef<HTMLDivElement>(null);
@@ -181,6 +188,17 @@ const DesktopHeader = () => {
           <SunMoonToggle theme={theme} />
           {isLoggedIn ? (
             <>
+              {targetStore ? (
+                <Link
+                  to={`/store/${targetStore.username}`}
+                  aria-label="ورود به فروشگاه من"
+                  prefetch="intent"
+                  className="inline-flex items-center gap-2 h-[42px] px-3.5 rounded-xl bg-WHITE3 text-BLACK text-[13.5px] font-bold hover:bg-WHITE2 transition-colors whitespace-nowrap"
+                >
+                  <Store size={18} />
+                  <span>فروشگاه من</span>
+                </Link>
+              ) : null}
               <Link
                 to="/profile/bookmarks"
                 aria-label="نشان‌شده‌ها"