Render Shopify imagery through next/image

Turn the optimizer back on by dropping images.unoptimized, and widen the
Shopify remote pattern to **.shopify.com so any image subdomain resolves.
With the optimizer live, remotePatterns is now actually enforced.

Convert the seven Shopify CDN call sites: the product/collection cards and
the gallery carousel size with fill + sizes, while the cart, order and
search thumbnails carry explicit dimensions. The avatar, markdown,
attachment, assistant and logo images stay plain <img> — they take
blob:/data: or arbitrary hosts that next/image cannot process.

The lightbox needs w-auto h-auto: the width and height attributes
next/image requires make both axes definite, so max-w/max-h clamp them
independently instead of preserving the ratio. object-contain masked that,
but the stretched element covered the overlay and ate the backdrop clicks
that close the dialog.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015uSQQNWrmiYDRW9L9VnsGC

components/shopify/order-history.tsx

@@ -1,6 +1,7 @@
 'use client';
 
 import React, { useState } from 'react';
+import Image from 'next/image';
 import { RiImageLine } from '@remixicon/react';
 import type { Customer, CustomerOrder } from '@/services/shopify/customer';
 
@@ -123,9 +124,11 @@ const OrderHistory: React.FC<OrderHistoryProps> = ({ customer }) => {
                 <li key={index} className="flex items-start gap-x-3">
                   <div className="h-16 w-16 shrink-0 overflow-hidden bg-zinc-100">
                     {node.variant?.image ? (
-                      <img
+                      <Image
                         src={node.variant.image.url}
                         alt={node.variant.image.altText || node.title}
+                        width={64}
+                        height={64}
                         className="h-full w-full object-cover"
                       />
                     ) : (