Add category detail URLs and polish mega menu UX.

Route categories to /products/category/{id}/{slug}, improve menu hover/layout, and hide stock/category clutter on product cards.

Co-authored-by: Cursor <cursoragent@cursor.com>

components/layout/MegaMenu.tsx

@@ -1,44 +1,56 @@
 "use client";
 
 import Link from "next/link";
-import { Placeholder } from "@/components/Placeholder";
-import type { NavCategory } from "@/lib/categories";
+import { toMegaSections, type NavCategory } from "@/lib/categories";
+
+function CategoryLinks({ items, depth = 0 }: { items: NavCategory[]; depth?: number }) {
+  if (!items.length) return null;
+
+  return (
+    <ul className={depth === 0 ? "space-y-1" : "mt-1 space-y-1 border-r border-line/70 pr-2 mr-1"}>
+      {items.map((item) => (
+        <li key={item.id}>
+          <Link
+            href={item.href}
+            className={`block rounded-lg px-2 py-1 transition hover:bg-paper hover:text-brand ${
+              depth === 0 ? "text-[12.5px] text-muted" : "text-[12px] text-muted/90"
+            }`}
+          >
+            {item.title}
+          </Link>
+          {item.children.length ? <CategoryLinks items={item.children} depth={depth + 1} /> : null}
+        </li>
+      ))}
+    </ul>
+  );
+}
 
 export function MegaMenu({ open, categories }: { open: boolean; categories: NavCategory[] }) {
   if (!open) return null;
 
+  const sections = toMegaSections(categories);
+
   return (
-    <div className="absolute top-full right-0 z-50 mt-1 w-[min(920px,calc(100vw-2rem))] border border-line bg-white p-5 shadow-[0_20px_50px_rgba(0,0,0,0.08)]">
-      {categories.length === 0 ? (
-        <p className="text-[13px] text-muted">دسته‌بندی‌ها به‌زودی اضافه می‌شوند.</p>
-      ) : (
-        <div className="grid grid-cols-2 gap-5 md:grid-cols-3 lg:grid-cols-4">
-          {categories.map((category) => (
-            <div key={category.id}>
-              <Link href={category.href} className="mb-3 flex items-center gap-2 text-[13.5px] font-semibold text-ink hover:text-brand">
-                <span className="grid size-9 place-items-center overflow-hidden rounded-xl bg-paper">
-                  <Placeholder src={category.image || "/placeholders/category.svg"} className="size-full object-cover" />
-                </span>
-                {category.title}
-              </Link>
-              {category.children.length ? (
-                <ul className="space-y-1.5 pr-1">
-                  {category.children.map((child) => (
-                    <li key={child.id}>
-                      <Link
-                        href={child.href}
-                        className="block rounded-lg px-2 py-1 text-[12.5px] text-muted transition hover:bg-paper hover:text-brand"
-                      >
-                        {child.title}
-                      </Link>
-                    </li>
-                  ))}
-                </ul>
-              ) : null}
-            </div>
-          ))}
-        </div>
-      )}
+    <div className="absolute top-full right-0 z-50 -mt-1 pt-3">
+      <div className="max-h-[min(70vh,640px)] w-[min(920px,calc(100vw-2rem))] overflow-y-auto border border-line bg-white p-5 shadow-[0_20px_50px_rgba(0,0,0,0.08)]">
+        {sections.length === 0 ? (
+          <p className="text-[13px] text-muted">دسته‌بندی‌ها به‌زودی اضافه می‌شوند.</p>
+        ) : (
+          <div className="columns-2 gap-6 md:columns-3 lg:columns-4">
+            {sections.map((category) => (
+              <div key={category.id} className="mb-6 break-inside-avoid">
+                <Link
+                  href={category.href}
+                  className="mb-2 block text-[13.5px] font-semibold text-ink hover:text-brand"
+                >
+                  {category.title}
+                </Link>
+                <CategoryLinks items={category.children} />
+              </div>
+            ))}
+          </div>
+        )}
+      </div>
     </div>
   );
 }