Update Book and SelectedPublisher component to require Publisher.

test/decentralised_book_index/metadata/forms/book_form_test.exs

@@ -63,8 +63,9 @@ defmodule DecentralisedBookIndex.Metadata.Forms.BookFormTest do
   end
 
   describe "create new book via the form" do
-    test "just name and description", %{user: user} do
+    test "with all required attributes", %{user: user} do
       bids = bids(actor: user)
+      publisher = generate(publisher())
       author_roles = author_roles(actor: user)
 
       valid_params = %{
@@ -75,7 +76,8 @@ defmodule DecentralisedBookIndex.Metadata.Forms.BookFormTest do
         "page_count" => 600,
         "published" => ~D[2025-03-06],
         "author_roles" => author_roles,
-        "bids" => bids
+        "bids" => bids,
+        "publisher_id" => publisher.id
       }
 
       form =