feat: add default content pages for delivery, privacy and terms

Replace one-off ShopLive.About with generic ShopLive.Content that
handles all static content pages via live_action. Add delivery &
returns, privacy policy, and terms of service pages with sample
content. Update footer help links and theme editor preview.

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

test/simpleshop_theme_web/live/shop_live/content_test.exs

@@ -0,0 +1,89 @@
+defmodule SimpleshopThemeWeb.ShopLive.ContentTest do
+  use SimpleshopThemeWeb.ConnCase, async: false
+
+  import Phoenix.LiveViewTest
+
+  describe "About page" do
+    test "renders about page", %{conn: conn} do
+      {:ok, _view, html} = live(conn, ~p"/about")
+
+      assert html =~ "About the studio"
+      assert html =~ "sample about page"
+    end
+
+    test "displays about image", %{conn: conn} do
+      {:ok, _view, html} = live(conn, ~p"/about")
+
+      assert html =~ "night-sky-blanket"
+    end
+  end
+
+  describe "Delivery page" do
+    test "renders delivery page", %{conn: conn} do
+      {:ok, _view, html} = live(conn, ~p"/delivery")
+
+      assert html =~ "Delivery & returns"
+      assert html =~ "shipping and returns"
+    end
+
+    test "displays delivery content", %{conn: conn} do
+      {:ok, _view, html} = live(conn, ~p"/delivery")
+
+      assert html =~ "Shipping"
+      assert html =~ "Returns & exchanges"
+      assert html =~ "Cancellations"
+    end
+
+    test "displays list items", %{conn: conn} do
+      {:ok, _view, html} = live(conn, ~p"/delivery")
+
+      assert html =~ "United Kingdom"
+      assert html =~ "5–8 business days"
+    end
+  end
+
+  describe "Privacy page" do
+    test "renders privacy page", %{conn: conn} do
+      {:ok, _view, html} = live(conn, ~p"/privacy")
+
+      assert html =~ "Privacy policy"
+      assert html =~ "personal information"
+    end
+
+    test "displays privacy content", %{conn: conn} do
+      {:ok, _view, html} = live(conn, ~p"/privacy")
+
+      assert html =~ "What we collect"
+      assert html =~ "Cookies"
+      assert html =~ "Your rights"
+    end
+  end
+
+  describe "Terms page" do
+    test "renders terms page", %{conn: conn} do
+      {:ok, _view, html} = live(conn, ~p"/terms")
+
+      assert html =~ "Terms of service"
+      assert html =~ "The legal bits"
+    end
+
+    test "displays terms content", %{conn: conn} do
+      {:ok, _view, html} = live(conn, ~p"/terms")
+
+      assert html =~ "Products"
+      assert html =~ "Orders & payment"
+      assert html =~ "Intellectual property"
+    end
+  end
+
+  describe "Footer links" do
+    test "footer contains policy page links", %{conn: conn} do
+      {:ok, _view, html} = live(conn, ~p"/about")
+
+      assert html =~ ~s(href="/delivery")
+      assert html =~ ~s(href="/privacy")
+      assert html =~ ~s(href="/terms")
+      assert html =~ ~s(href="/contact")
+    end
+  end
+end