fix(channel): start a thread in a forum without throwing

[mikield]

startThreadInForumChannel() has never worked. Any call dies before it reaches the network:

Too few arguments to function Tempcord\Discord\Rest\HttpResource::__construct(),
0 passed in src/Rest/Channel.php on line 709 and exactly 3 expected

The method built its return type as an anonymous class:

$forumChannelWithMessage = new class () extends Channel {
    public Message $message;
};

Inside Rest\Channel, the bare name Channel is that class itself — Parts\Channel is imported under the alias PartsChannel. So the anonymous class extended the REST resource, whose constructor takes three arguments, and instantiating it threw immediately.

No test referenced the method, which is how it stayed broken. There is one now.

Parts\ForumThread

The type it was reaching for is now a real part rather than an anonymous class. This is the only call where Discord answers with a channel that carries a message, and that message is what reactions and edits on the post address — so it is worth a name. It also means a caller can be typed against it: an anonymous class cannot be referenced from outside the method, so static analysis flagged every use of ->message as an undefined property and the only way through was a cast.

Found while porting a bot whose petitions are forum posts that members vote on with reactions.

🤖 Generated with Claude Code

[github-actions]

🎉 This PR is included in version 1.3.1 🎉

The release is available on GitHub release

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