fix(tui): resolve undefined refresh_chrome in _on_stream exit-boundary replay

[Kailigithub]

Problem

In _on_stream(), the exit-boundary replay code path (lines 4770-4778) references refresh_chrome which is not a parameter of the method. This causes a NameError at runtime when:

1. An exit-boundary replay starts a follow-up task before the original display queue emits its final done
2. The old done event triggers the stale-task-id branch
3. if refresh_chrome: evaluates an undefined name → NameError

The issue was introduced during the exit-boundary replay refactoring where refresh_chrome was referenced but the variable was only available as a parameter in _update_assistant(), not in _on_stream().

Fix

Since this code path already guards with if found and agent_id == self.current_id:, the sidebar/topbar refresh is always appropriate (we're updating the display for the active agent). Removed the undefined refresh_chrome conditional and made the chrome refresh unconditional within the current_id guard block.

Also fixed the indentation: the display update block was at the wrong level, causing the refresh_chrome reference to execute outside the agent_id == self.current_id guard.

Verification

• ruff check frontends/tuiapp_v2.py --select F821 → All checks passed
• python3 -m py_compile frontends/tuiapp_v2.py → No syntax errors