add order status lookup for customers

Magic link flow on contact page: customer enters email, gets a
time-limited signed link, clicks through to /orders showing all their
paid orders and full detail pages with thumbnails and product links.

- OrderLookupController generates/verifies Phoenix.Token signed links
- Contact LiveView handles lookup_orders + reset_tracking events
- Orders and OrderDetail LiveViews gated by session email
- Order detail shows thumbnails, links to products still available
- .themed-button gets base padding/font-weight so all usages are consistent
- order-summary-card sticky scoped to .cart-grid (was leaking to orders list)
- 27 new tests (1095 total)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/berrypod/orders/order_notifier.ex

@@ -42,6 +42,31 @@ defmodule Berrypod.Orders.OrderNotifier do
     deliver(order.customer_email, subject, body)
   end
 
+  @doc """
+  Sends a magic link for the customer to view their orders.
+
+  The link is time-limited (controlled by the caller's token expiry).
+  """
+  def deliver_order_lookup(email, link) do
+    subject = "Your order lookup link"
+
+    body = """
+    ==============================
+
+    Here's your link to view your orders:
+
+    #{link}
+
+    This link expires in 1 hour.
+
+    If you didn't request this, you can ignore this email.
+
+    ==============================
+    """
+
+    deliver(email, subject, body)
+  end
+
   @doc """
   Sends a shipping notification with tracking info.