[BUG] No way to reassign or remove session-to-project associations after the assignment feature was removed

What's Wrong?

The ability to add/assign a local Claude Code session to a "project" appears to have been removed from the Claude Desktop UI. However, existing sessions retain their previous project associations, which are now stale or incorrect, and there is no UI path to correct or remove them. The session→project state appears to be account-synced/cached, so local edits do not persist.

What Should Happen?

Users should be able to reassign or clear a session's project association (and remove stale/empty projects) from the UI. Existing associations should not be left stranded with no way to manage them after the assignment feature changed.

Error Messages/Logs

(no error; the UI no longer offers a way to manage session-to-project associations)

Steps to Reproduce

1. Have local code sessions that were previously associated with projects.
2. In the current desktop UI, attempt to change or remove a session's project association.
3. Observe there is no available control to reassign/remove it, and stale/incorrect associations remain.

Regression?

Yes, this worked in a previous version

Claude Code Version

~2.1.156 (Claude Desktop, integrated Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other (Claude Desktop integrated environment)

Additional Information

The session→project associations do not appear in editable local config (not in claude_desktop_config.json or ~/.claude.json), which suggests they are stored in account-synced app state. A user-facing way to re-home or remove these would resolve the stranded associations. This is distinct from claude.ai "Projects" (knowledge projects), which are unaffected.