wire order pages and theme preview to page renderer, remove old templates

All 14 pages now render through PageRenderer. Theme editor preview
unified from 10 preview_page clauses to one function + page-context
helpers. PageTemplates module and 10 .heex template files deleted.

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

lib/berrypod_web/components/page_templates.ex

@@ -1,30 +0,0 @@
-defmodule BerrypodWeb.PageTemplates do
-  @moduledoc """
-  Shared page templates used by both the public shop and theme preview.
-
-  These templates accept a `mode` parameter to control navigation behavior:
-  - `:shop` - Links navigate normally (real shop pages)
-  - `:preview` - Links send events to parent LiveView (theme editor)
-
-  All templates expect these common assigns:
-  - `theme_settings` - Current theme configuration
-  - `logo_image` - Logo image struct or nil
-  - `header_image` - Header image struct or nil
-  - `mode` - `:shop` or `:preview`
-  - `cart_items` - List of cart items (can be empty)
-  - `cart_count` - Number of items in cart
-  """
-  use Phoenix.Component
-  use BerrypodWeb.ShopComponents
-
-  embed_templates "page_templates/*"
-
-  def format_order_status("unfulfilled"), do: "Being prepared"
-  def format_order_status("submitted"), do: "Sent to printer"
-  def format_order_status("processing"), do: "In production"
-  def format_order_status("shipped"), do: "On its way"
-  def format_order_status("delivered"), do: "Delivered"
-  def format_order_status("failed"), do: "Issue — contact us"
-  def format_order_status("cancelled"), do: "Cancelled"
-  def format_order_status(status), do: status
-end