Bug Description

When using hermes --tui, the terminal UI rendering breaks with Chinese text output. Characters scatter to the right side of the screen, leaving ghost trails and overlapping text.

Steps to Reproduce

1. Run hermes --tui
2. Engage in a conversation that produces Chinese text output (several paragraphs)
3. Observe — text does not wrap correctly, characters appear scattered on the right side

Expected Behavior

Chinese text should render cleanly without ghosting or scattering.

Actual Behavior

• Characters scatter on the right side of the screen
• Large irregular whitespace mid-sentence
• Characters overlap vertically (ghost effect)
• Status bar shows duplicated fragments
• Text lines broken mid-sentence

Environment

• OS: WSL2
• Terminal: Windows Terminal / browser-based terminal

Possible Cause

CJK character width calculation issue. Chinese characters are full-width (2 cells) but the TUI rendering engine calculates them as 1 cell, causing incorrect line-wrap and cursor position misalignment.