## Why
Built-in permission selections in connected TUI threads previously applied local settings directly. Use server-confirmed settings so the TUI adopts the authoritative permissions and refreshes cached network configuration.
## What changed
- Send built-in permission selections through the existing app-server settings API, including selections after Windows sandbox setup. Allow built-in selections during a running turn.
- Block task creation and switching while permission updates are pending, restoring submitted text to the composer when necessary.
- Refresh local permissions, approval settings, runtime overrides, and network configuration when the server confirms a built-in selection.
- Submit a pending initial prompt when the selected permissions already match the current settings.
## Testing
Add regression tests for server-confirmed built-in selection during a running turn, blocked task switches, stale proxy removal, and pending prompt submission when permissions already match. Update background-task tests to wait for settings confirmation.
GitOrigin-RevId: 76e71a8c278c37c0a7ce7c0246da7d185e12ee7a
2b59d92dbd