add data-driven navigation with admin editor

Replace hardcoded header, footer and mobile nav with settings-driven
loops. Nav items stored as JSON via Settings, loaded in ThemeHook with
sensible defaults. New admin navigation editor at /admin/navigation
for add/remove/reorder/save/reset. Mobile bottom nav also driven from
header nav items with icon mapping by slug.

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

test/berrypod_web/live/shop/navigation_test.exs

@@ -0,0 +1,91 @@
+defmodule BerrypodWeb.Shop.NavigationTest do
+  use BerrypodWeb.ConnCase, async: false
+
+  import Phoenix.LiveViewTest
+  import Berrypod.AccountsFixtures
+
+  alias Berrypod.{Pages, Settings}
+  alias Berrypod.Pages.PageCache
+
+  setup do
+    PageCache.invalidate_all()
+    user_fixture()
+    {:ok, _} = Settings.set_site_live(true)
+    :ok
+  end
+
+  describe "header navigation" do
+    test "renders default items", %{conn: conn} do
+      {:ok, _view, html} = live(conn, ~p"/")
+
+      assert html =~ "Home"
+      assert html =~ "Shop"
+      assert html =~ "About"
+      assert html =~ "Contact"
+    end
+
+    test "renders from saved settings", %{conn: conn} do
+      Settings.put_setting(
+        "header_nav",
+        [
+          %{"label" => "Blog", "href" => "/blog", "slug" => "blog"},
+          %{"label" => "FAQ", "href" => "/faq", "slug" => "faq"}
+        ],
+        "json"
+      )
+
+      {:ok, _view, html} = live(conn, ~p"/")
+
+      assert html =~ "Blog"
+      assert html =~ "FAQ"
+      refute html =~ ~s(>Shop</a>)
+    end
+  end
+
+  describe "footer navigation" do
+    test "renders default items", %{conn: conn} do
+      {:ok, _view, html} = live(conn, ~p"/")
+
+      assert html =~ "Delivery &amp; returns"
+      assert html =~ "Privacy policy"
+      assert html =~ "Terms of service"
+    end
+
+    test "renders from saved settings", %{conn: conn} do
+      Settings.put_setting(
+        "footer_nav",
+        [
+          %{"label" => "Returns", "href" => "/returns", "slug" => "returns"},
+          %{"label" => "Shipping", "href" => "/shipping", "slug" => "shipping"}
+        ],
+        "json"
+      )
+
+      {:ok, _view, html} = live(conn, ~p"/")
+
+      assert html =~ "Returns"
+      assert html =~ "Shipping"
+      refute html =~ "Privacy policy"
+    end
+  end
+
+  describe "custom page in navigation" do
+    test "renders when added to header nav", %{conn: conn} do
+      {:ok, _} = Pages.create_custom_page(%{slug: "faq", title: "FAQ"})
+
+      Settings.put_setting(
+        "header_nav",
+        [
+          %{"label" => "Home", "href" => "/", "slug" => "home"},
+          %{"label" => "FAQ", "href" => "/faq", "slug" => "faq"}
+        ],
+        "json"
+      )
+
+      {:ok, _view, html} = live(conn, ~p"/")
+
+      assert html =~ ~s(href="/faq")
+      assert html =~ "FAQ"
+    end
+  end
+end