Desktop responsive: search page, cart list, masonry grid

- MondrianProductList: add desktop 4-column masonry (mobile 2-col unchanged);
  improves home "for you", search results and seller feed at lg+
- search: hide mobile SearchTopBar at lg, add results heading + centered
  1320px container
- cart list: responsive 2-column grid of cart cards + desktop heading
- MyLayout: desktop chrome gate now covers / , /search/* and /cart

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

app/components/MondrianProductList.tsx

@@ -96,8 +96,17 @@ const MondrianProductList = ({
 
   const oddHeight = useMemo(() => [220, 260, 320, 200, 280], []);
   const evenHeight = useMemo(() => [280, 200, 260, 220, 320], []);
+
+  // Desktop masonry: distribute products across 4 columns (round-robin).
+  const desktopColumns = useMemo(() => {
+    const cols: MondrianList[][] = [[], [], [], []];
+    products.forEach((p, i) => cols[i % 4].push(p));
+    return cols;
+  }, [products]);
+  const desktopHeights = useMemo(() => [300, 360, 260, 340, 280, 320], []);
+
   return (
-    <div className="px-4 flex flex-col w-full">
+    <div className="px-4 lg:px-0 flex flex-col w-full">
       {!isCommonList ? (
         <>
           {isLoading ? (
@@ -113,7 +122,8 @@ const MondrianProductList = ({
             />
           ) : (
             <>
-              <div className="flex gap-1 w-full">
+              {/* Mobile / tablet: original two-column masonry (unchanged) */}
+              <div className="flex gap-1 w-full lg:hidden">
                 {/* Column 1 (Odd products - index 0, 2, ...) */}
                 <div className="flex flex-col gap-1 w-[calc(50%)]">
                   {oddProducts.map((product, index: number) => {
@@ -146,6 +156,26 @@ const MondrianProductList = ({
                   })}
                 </div>
               </div>
+
+              {/* Desktop: 4-column masonry */}
+              <div className="hidden lg:flex gap-4 w-full">
+                {desktopColumns.map((col, ci) => (
+                  <div key={ci} className="flex flex-col gap-4 flex-1 min-w-0">
+                    {col.map((product, index) => (
+                      <ProductCard
+                        key={product.id}
+                        product={product}
+                        height={
+                          desktopHeights[(ci + index) % desktopHeights.length]
+                        }
+                        storeId={storeId}
+                        storePage={storePage}
+                      />
+                    ))}
+                  </div>
+                ))}
+              </div>
+
               {hasNextPage && <MondrianSkeleton isMini={true} />}
             </>
           )}

app/components/MyLayout.tsx

@@ -27,10 +27,12 @@ import productsOutline from "~/assets/icons/navbar/products-outline.svg";
  */
 const MyLayout = React.memo(({ children }: { children: React.ReactNode }) => {
   const location = useLocation();
-  // Desktop chrome is rolled out per-page. Only routes listed here get the
+  // Desktop chrome is rolled out per-page. Only routes matched here get the
   // full-width desktop layout; everything else keeps the current (mobile)
   // experience at all widths so nothing regresses while we build the rest.
-  const isDesktopReady = location.pathname === "/";
+  const p = location.pathname;
+  const isDesktopReady =
+    p === "/" || p.startsWith("/search/") || p === "/cart";
   const isThread = !!location.pathname.split("threads")[1];
 
   return (

app/routes/cart._index.tsx

@@ -59,11 +59,16 @@ export default function CartIndex() {
   };
   return (
     <div className="bg-background">
-      {/* Header */}
-      <ProfilePagesHeader hideBackButton={true} title="لیست سبد خرید" />
+      {/* Header (mobile) */}
+      <div className="lg:hidden">
+        <ProfilePagesHeader hideBackButton={true} title="لیست سبد خرید" />
+      </div>
 
       {/* Cart Content */}
-      <div className="flex flex-col gap-4 p-4">
+      <div className="flex flex-col gap-4 p-4 lg:max-w-[1320px] lg:mx-auto lg:w-full lg:px-8 lg:py-8">
+        <h1 className="hidden lg:block text-[28px] font-extrabold mb-2">
+          سبد خرید
+        </h1>
         <UiProvider
           isLoading={isLoading}
           isError={isError}
@@ -73,7 +78,7 @@ export default function CartIndex() {
           }}
           type="cart"
         >
-          <div className="space-y-4 w-full">
+          <div className="space-y-4 w-full lg:space-y-0 lg:grid lg:grid-cols-2 lg:gap-5">
             {carts.map((cart) => {
               return (
                 <div

app/routes/search.$query.tsx

@@ -1,6 +1,6 @@
 import React, { useState, useEffect } from "react";
 import { MetaFunction } from "@remix-run/node";
-import { useNavigate, useParams } from "@remix-run/react";
+import { Link, useNavigate, useParams } from "@remix-run/react";
 import { onSearch } from "../utils/helpers";
 import { PackageSearch } from "lucide-react";
 import { useSearchInfinite } from "../requestHandler/use-search-hooks";
@@ -31,15 +31,32 @@ export default function Search() {
   } = useSearchInfinite(query);
 
   return (
-    <div className="flex flex-col gap-6 bg-WHITE">
-      <SearchTopBar
-        searchValue={searchValue}
-        setSearchValue={setSearchValue}
-        placeholder="جستجو..."
-        minimumPrice={320000}
-        maximumPrice={1000000}
-        onSearch={() => onSearch(searchValue, navigate)}
-      />
+    <div className="flex flex-col gap-6 bg-WHITE lg:max-w-[1320px] lg:mx-auto lg:w-full lg:px-8 lg:py-6">
+      <div className="lg:hidden">
+        <SearchTopBar
+          searchValue={searchValue}
+          setSearchValue={setSearchValue}
+          placeholder="جستجو..."
+          minimumPrice={320000}
+          maximumPrice={1000000}
+          onSearch={() => onSearch(searchValue, navigate)}
+        />
+      </div>
+
+      {/* Desktop results heading */}
+      <div className="hidden lg:block">
+        <nav className="flex items-center gap-2 text-[13px] text-GRAY">
+          <Link to="/" className="hover:text-BLACK">
+            خانه
+          </Link>
+          <span>/</span>
+          <span>جستجو</span>
+        </nav>
+        <h1 className="text-[26px] font-extrabold mt-2">
+          نتایج برای «<span className="text-VITROWN_BLUE">{query}</span>»
+        </h1>
+      </div>
+
       <MondrianProductList
         products={
           data?.pages