Support X reply controls in Typefully drafts and API

Please add support for X reply controls when creating, editing, scheduling, and publishing posts through Typefully.

Use case: some accounts need to limit replies on public posts to reduce spam or coordinated harassment. On X, this is the “Who can reply?” control, with options like:

- Everyone
- Accounts you follow
- Verified accounts
- Only accounts you mention

Right now, Typefully appears to publish X posts with the default “Everyone can reply” setting. We tested this by publishing X-only drafts through Typefully after manually setting a previous post to “Only accounts you mention,” but the next Typefully-published post still allowed replies from everyone. The API/MCP draft payload also appears to expose platforms.x.settings: null, with no visible reply-control field.

Request:

• Add a reply-control selector in the Typefully UI for X posts.

• Expose the same setting through the Typefully API.

• Allow a per-account default, ideally “Only accounts you mention.”

• Preserve the selected setting when editing, copying, duplicating, or scheduling drafts.

This matters for teams that want to use Typefully as the source of truth for scheduling, review, and analytics, but still need X’s native conversation controls for moderation and safety.

X’s own API supports this through reply_settings, including mentionedUsers, so this should map cleanly to X’s post creation API.