[BUG] Session becomes permanently invisible in mobile app after Unarchive — filter counts don't match actual session state

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Environment:

Claude mobile app (iOS)
Affected: a Claude Code "Connected" session viewed via the app's "Code" section

Actual behavior:

The session disappears entirely from the list — not shown under "All", and not shown under "Archived" either.
Opening the status filter ("Filter by status") shows count "Archived: 2", "All: 0", but the two sessions actually shown when filtering by "Archived" are two different, unrelated sessions that are not archived at all (confirmed independently: their backend isArchived flag is false).
The specific session that was unarchived is not visible under any filter.
Troubleshooting already tried (no effect):

Logout and login again in the app — same incorrect state persists.
Fully deleting and reinstalling the app — app auto-logged back in (via retained credentials/keychain) and the session list state was identical, still missing the session and still misreporting the other two as "Archived".

What Should Happen?

Expected behavior:

After tapping "Unarchive", the session should reappear in the default/active session list.
Filter counts and filtered results should match the actual archived/active state of each session.

Error Messages/Logs

Steps to Reproduce

1.Have an active Claude Code session running on a desktop machine, connected and visible in the mobile app's session list (status: "Connected").
2.Open the session from the mobile app. It shows as "This session has been archived" and doesn't allow typing.
3.Tap the 3-dot menu → "Unarchive".
4.Go back to the session list.

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

IOS app v1.260721.0

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

The underlying session data and work on the desktop machine were unaffected — this is purely a mobile app list/sync display bug, not data loss.
The session in question was originally reachable and marked "Connected" before this occurred.