Mobile GUI effort slider doesn't reflect actual session effort level on open

Same Claude Code session accessed via CLI and the mobile app.

Steps to reproduce:

1. Open mobile GUI's effort control on a session already in progress
2. Slider/label showed "High"

Expected: the effort control should read and display the session's true
current effort level on open, not a possibly stale/default value.

Actual: showed "High" — not confirmed to match the session's actual
current effort setting at that moment.

After manually setting the slider to Medium, it correctly updated and
displayed Medium going forward.

Note: I can't confirm from the CLI side what the session's true effort
value was at the moment the GUI first opened — flagging this as a
potential bug rather than confirmed, since the mismatch on initial
load wasn't independently verified against backend state.