fix: make tweet_like tests pass

- Add authorize?: false to user_fixture so register_with_password
  bypasses policy check in test context
- Add require Ash.Query so Ash.Query.filter macro works in count_likes
- Replace nonexistent Ash.ForbiddenField.forbidden?/1 with match?/2
- Fix stale tweet struct in :like noop case by reloading from DB

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

lib/mixer/posts/tweet.ex

@@ -127,7 +127,7 @@ defmodule Mixer.Posts.Tweet do
               increment_likes(tweet, context.actor)
 
             {:noop, _like} ->
-              {:ok, tweet}
+              Ash.get(__MODULE__, tweet.id, authorize?: false)
 
             {:error, error} ->
               {:error, error}