[Bug]: Navigating back from a delegated sub-agent on mobile goes back to the project list rather than the delegator thread #23765

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/mobile

Steps to reproduce

1. On mobile, open a project and open a parent / delegator thread that has spawned a delegated sub-agent.
2. Tap into the delegated sub-agent thread from the delegator (via the sub-agent entry in the timeline).
3. Once inside the sub-agent thread, tap Back (top-left in-app back button or the OS back gesture).
4. Observe where you land.

Expected behavior

The view should change back to the delegator thread rather than the project list.

Actual behavior

The view change directly to the project list.

Impact

Minor bug or occasional failure

Version or commit

0.1.2-nightly.20261022.3526 (f054d1b)

Environment

Android 116, host on MacOS

Logs or stack traces

Screenshots, recordings, or supporting files

No response

Workaround

No response