fix: resolve CI and workspace lint errors (admin + storefront)

- Allow require() in next.config.js (eslint-disable) for both apps
- Replace all catch (e: any) with catch (e: unknown) and proper error handling
- Remove no-explicit-any: add types (PreviewProduct, ProductImage, Id<addresses>,
  ProductDetailReview, error payloads) across admin and storefront
- Admin: use next/image in ImageUploadSection and ProductImageCarousel; remove
  unused layout fonts and sidebar imports; fix products page useMemo deps
- Storefront: use Link for /sign-in in header actions; fix useAddressMutations
  and product detail types; remove unused imports/vars and fix useMemo deps

Made-with: Cursor

apps/storefront/src/components/layout/header/mobile/MobileHeaderUserAction.tsx

@@ -1,5 +1,6 @@
 "use client";
 
+import Link from "next/link";
 import { useConvexAuth } from "convex/react";
 import { UserButton } from "@clerk/nextjs";
 
@@ -27,7 +28,7 @@ export function MobileHeaderUserAction() {
 
   if (isLoading || !isAuthenticated) {
     return (
-      <a
+      <Link
         href="/sign-in"
         className="flex h-8 w-8 items-center justify-center rounded-full border border-[#d9e8e7] bg-[#f9fcfb]"
       >
@@ -45,7 +46,7 @@ export function MobileHeaderUserAction() {
           <path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2" />
           <circle cx="12" cy="7" r="4" />
         </svg>
-      </a>
+      </Link>
     );
   }