add pagination across all admin and shop views

URL-based offset pagination with ?page=N for bookmarkable pages.
Admin views use push_patch, shop collection uses navigate links.
Responsive on mobile with horizontal-scroll tables and stacking
pagination controls. Includes dev seed script for testing.

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

lib/berrypod_web/live/shop/collection.ex

@@ -1,7 +1,7 @@
 defmodule BerrypodWeb.Shop.Collection do
   use BerrypodWeb, :live_view
 
-  alias Berrypod.{Pages, Products}
+  alias Berrypod.{Pages, Pagination, Products}
 
   @sort_options [
     {"featured", "Featured"},
@@ -28,18 +28,21 @@ defmodule BerrypodWeb.Shop.Collection do
   @impl true
   def handle_params(%{"slug" => slug} = params, _uri, socket) do
     sort = params["sort"] || "featured"
+    page_num = Pagination.parse_page(params)
 
-    case load_collection(slug, sort) do
-      {:ok, title, category, products} ->
+    case load_collection(slug, sort, page_num) do
+      {:ok, title, category, pagination} ->
         {:noreply,
          socket
          |> assign(:page_title, title)
          |> assign(:page_description, collection_description(title))
          |> assign(:og_url, BerrypodWeb.Endpoint.url() <> "/collections/#{slug}")
          |> assign(:collection_title, title)
+         |> assign(:collection_slug, slug)
          |> assign(:current_category, category)
          |> assign(:current_sort, sort)
-         |> assign(:products, products)}
+         |> assign(:pagination, pagination)
+         |> assign(:products, pagination.items)}
 
       :not_found ->
         {:noreply,
@@ -49,22 +52,30 @@ defmodule BerrypodWeb.Shop.Collection do
     end
   end
 
-  defp load_collection("all", sort) do
-    {:ok, "All Products", nil, Products.list_visible_products(sort: sort)}
+  defp load_collection("all", sort, page) do
+    pagination = Products.list_visible_products_paginated(sort: sort, page: page)
+    {:ok, "All Products", nil, pagination}
   end
 
-  defp load_collection("sale", sort) do
-    {:ok, "Sale", :sale, Products.list_visible_products(on_sale: true, sort: sort)}
+  defp load_collection("sale", sort, page) do
+    pagination = Products.list_visible_products_paginated(on_sale: true, sort: sort, page: page)
+    {:ok, "Sale", :sale, pagination}
   end
 
-  defp load_collection(slug, sort) do
+  defp load_collection(slug, sort, page) do
     case Enum.find(Products.list_categories(), &(&1.slug == slug)) do
       nil ->
         :not_found
 
       category ->
-        products = Products.list_visible_products(category: category.name, sort: sort)
-        {:ok, category.name, category, products}
+        pagination =
+          Products.list_visible_products_paginated(
+            category: category.name,
+            sort: sort,
+            page: page
+          )
+
+        {:ok, category.name, category, pagination}
     end
   end