Refine extension panel beta controls and tester access

[Jamesllllllllll]

Summary

Refines the Twitch extension beta surface with compact moderator controls, a dashboard preview route, tester-only install access, and faster reply queue settings.

What Changed

• Added a dashboard panel preview route and ShadCN collapsible queue controls for moderator actions in the extension panel UI.
• Tightened the moderator action footprint, updated tester/install gating on dashboard settings, and documented the beta rollout flow.
• Lowered backend queue batching for Twitch chat replies and updated extension validation to support the new panel actions.

How To Test

1. Run npm run check:staged.
2. Run npm run check:prepush.
3. Open /dashboard/panel-preview and verify shuffle, reorder, VIP, play, mark played, and delete behavior.
4. Open /dashboard/settings as an owner, app admin, allowed beta tester, and regular user to confirm the preview/install buttons are gated correctly.
5. Rebuild and upload the Hosted Test panel bundle, then verify the Twitch panel loads and the moderator drawer actions behave correctly.
6. Send a chat request and confirm the bot reply arrives with the reduced queue delay.

Screenshots Or UI Notes

The panel now keeps moderator actions in a compact Manage drawer, and the dashboard preview mirrors that interaction with mock data.

Checklist

• I tested the change locally
• I updated docs or examples if needed
• I called out any follow-up work or known limitations

[github-actions]

Preview deployment updated.

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