`[Bug] Archived temporary huddle remains visible and cannot be deleted`

> [A temporary private huddle remains visible in the Buzz Desktop sidebar after its 1-hour lifetime.

Channel Settings still shows “Archive channel” and “Delete channel”, but every action returns:

relay returned 400 Bad Request: invalid: channel is archived

Expected:
- The expired huddle disappears automatically, or
- Desktop shows an Unarchive action and Delete works afterward.

Actual:
- The channel looks active in Desktop.
- The relay considers it archived.
- Archive, Delete, Leave, and member changes all fail.

Channel ID: 1b6049d7…98e8
Platform: macOS
Buzz Desktop version: [invullen via Settings/About]
!IMPORTANT]
> Do not include security vulnerabilities in a public issue. [Report them
> privately through a GitHub security advisory](https://github.com/block/buzz/security/advisories/new).

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