- Product-page chat buttons pass the product id when starting a thread, so it's
shared into the conversation as a card the seller can see (and tap through).
- MessageBubble renders the product card (image, title, price → product page);
card-only messages no longer render an empty bubble.
- Inbox preview shows 🛍 <product> instead of "بدون پیام" for product-card
threads. ChatProductCard type + product on message/last-message types.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
