feat: add order management admin with list and detail views

Admin UI at /admin/orders to view, filter, and inspect orders.
Adds list_orders/1 and count_orders_by_status/0 to the Orders
context, status filter tabs, clickable order table with streams,
and a detail page showing items, totals, and shipping address.

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

test/simpleshop_theme_web/live/admin_live/orders_test.exs

@@ -0,0 +1,119 @@
+defmodule SimpleshopThemeWeb.AdminLive.OrdersTest do
+  use SimpleshopThemeWeb.ConnCase, async: false
+
+  import Phoenix.LiveViewTest
+  import SimpleshopTheme.AccountsFixtures
+  import SimpleshopTheme.OrdersFixtures
+
+  setup do
+    user = user_fixture()
+    %{user: user}
+  end
+
+  describe "unauthenticated" do
+    test "redirects to login", %{conn: conn} do
+      {:error, redirect} = live(conn, ~p"/admin/orders")
+      assert {:redirect, %{to: path}} = redirect
+      assert path == ~p"/users/log-in"
+    end
+  end
+
+  describe "order list" do
+    setup %{conn: conn, user: user} do
+      conn = log_in_user(conn, user)
+      %{conn: conn}
+    end
+
+    test "renders empty state when no orders", %{conn: conn} do
+      {:ok, _view, html} = live(conn, ~p"/admin/orders")
+
+      assert html =~ "No orders yet"
+      assert html =~ "Orders"
+    end
+
+    test "renders orders table", %{conn: conn} do
+      order = order_fixture(payment_status: "paid", customer_email: "test@shop.com")
+
+      {:ok, _view, html} = live(conn, ~p"/admin/orders")
+
+      assert html =~ order.order_number
+      assert html =~ "test@shop.com"
+      assert html =~ "paid"
+    end
+
+    test "filters by status", %{conn: conn} do
+      paid = order_fixture(payment_status: "paid")
+      _pending = order_fixture()
+
+      {:ok, view, _html} = live(conn, ~p"/admin/orders")
+
+      html = render_click(view, "filter", %{"status" => "paid"})
+
+      assert html =~ paid.order_number
+    end
+
+    test "navigates to order detail", %{conn: conn} do
+      order = order_fixture(payment_status: "paid")
+
+      {:ok, _view, html} = live(conn, ~p"/admin/orders")
+
+      assert html =~ ~p"/admin/orders/#{order}"
+    end
+  end
+
+  describe "order detail" do
+    setup %{conn: conn, user: user} do
+      conn = log_in_user(conn, user)
+      %{conn: conn}
+    end
+
+    test "renders order details", %{conn: conn} do
+      order = order_fixture(payment_status: "paid", customer_email: "buyer@example.com")
+
+      {:ok, _view, html} = live(conn, ~p"/admin/orders/#{order}")
+
+      assert html =~ order.order_number
+      assert html =~ "buyer@example.com"
+      assert html =~ "paid"
+      assert html =~ "Order details"
+    end
+
+    test "shows line items", %{conn: conn} do
+      order = order_fixture(product_name: "Cool T-shirt", variant_title: "Blue / XL")
+
+      {:ok, _view, html} = live(conn, ~p"/admin/orders/#{order}")
+
+      assert html =~ "Cool T-shirt"
+      assert html =~ "Blue / XL"
+    end
+
+    test "shows shipping address", %{conn: conn} do
+      order = order_fixture(payment_status: "paid")
+
+      {:ok, updated_order} =
+        SimpleshopTheme.Orders.update_order(order, %{
+          shipping_address: %{
+            "name" => "Jane Doe",
+            "line1" => "42 Test Street",
+            "city" => "London",
+            "postal_code" => "SW1A 1AA",
+            "country" => "GB"
+          }
+        })
+
+      {:ok, _view, html} = live(conn, ~p"/admin/orders/#{updated_order}")
+
+      assert html =~ "Jane Doe"
+      assert html =~ "42 Test Street"
+      assert html =~ "London"
+      assert html =~ "SW1A 1AA"
+    end
+
+    test "redirects when order not found", %{conn: conn} do
+      fake_id = Ecto.UUID.generate()
+
+      {:error, {:live_redirect, %{to: "/admin/orders"}}} =
+        live(conn, ~p"/admin/orders/#{fake_id}")
+    end
+  end
+end