add legal page editor integration and media library polish

Legal pages (privacy, delivery, terms) now auto-populate content from
shop settings on mount, show auto-generated vs customised badges, and
have a regenerate button. Theme editor gains alt text fields for logo,
header, and icon images. Image picker in page builder now has an upload
button and alt text warning badges. Clearing unused image references
shows an orphan info flash.

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

test/berrypod_web/live/admin/pages_test.exs

@@ -1004,6 +1004,66 @@ defmodule BerrypodWeb.Admin.PagesTest do
     end
   end
 
+  describe "legal page editor" do
+    setup %{conn: conn, user: user} do
+      %{conn: log_in_user(conn, user)}
+    end
+
+    test "shows regenerate button for privacy page", %{conn: conn} do
+      {:ok, view, _html} = live(conn, ~p"/admin/pages/privacy")
+
+      assert has_element?(view, "button[phx-click='regenerate_legal']", "Regenerate")
+    end
+
+    test "shows regenerate button for delivery page", %{conn: conn} do
+      {:ok, view, _html} = live(conn, ~p"/admin/pages/delivery")
+
+      assert has_element?(view, "button[phx-click='regenerate_legal']", "Regenerate")
+    end
+
+    test "does not show regenerate button for home page", %{conn: conn} do
+      {:ok, view, _html} = live(conn, ~p"/admin/pages/home")
+
+      refute has_element?(view, "button[phx-click='regenerate_legal']")
+    end
+
+    test "shows auto-generated badge for legal pages on mount", %{conn: conn} do
+      {:ok, view, _html} = live(conn, ~p"/admin/pages/privacy")
+
+      assert has_element?(view, ".admin-badge-info", "Auto-generated from settings")
+    end
+
+    test "auto-populates content_body on mount for legal pages", %{conn: conn} do
+      {:ok, view, _html} = live(conn, ~p"/admin/pages/privacy")
+
+      # The content_body block should be expanded to see the content
+      page = Pages.get_page("privacy")
+      content_body = Enum.find(page.blocks, &(&1["type"] == "content_body"))
+      render_click(view, "toggle_expand", %{"id" => content_body["id"]})
+
+      html = render(view)
+      # Should contain generated legal content
+      assert html =~ "What we collect"
+    end
+
+    test "shows customised badge after manual edit", %{conn: conn} do
+      {:ok, view, _html} = live(conn, ~p"/admin/pages/privacy")
+
+      page = Pages.get_page("privacy")
+      content_body = Enum.find(page.blocks, &(&1["type"] == "content_body"))
+
+      render_click(view, "toggle_expand", %{"id" => content_body["id"]})
+
+      render_change(view, "update_block_settings", %{
+        "block_id" => content_body["id"],
+        "block_settings" => %{"content" => "Custom privacy content here"}
+      })
+
+      assert has_element?(view, ".admin-badge", "Customised")
+      refute has_element?(view, ".admin-badge-info", "Auto-generated from settings")
+    end
+  end
+
   defp count_repeater_items(html) do
     Regex.scan(~r/class="repeater-item"/, html) |> length()
   end