Fixed

Enhanced input: sending long Chinese text no longer shows �� in agents. Terminal writes are now chunked at character boundaries, so no Chinese character is split across two writes (which affected agents like Cursor that decode incrementally).
The file tree now remembers its expanded state after restart. Persisted expanded directories are restored before first paint, so it no longer flashes fully collapsed.
The file panel empty state is now truly centered. The hidden file tree no longer leaves an invisible placeholder that squeezes the layout.

Pier 0.1.41: Enhanced Input Sending—Long Chinese No Longer Displays as `���` in the Agent