question tool: hover causes option text to overlap gray description (CJK)

Bug: question tool options — hover causes text to overlap the gray description

Environment

• opencode 1.18.15 (Homebrew), macOS
• @opentui/core / @opentui/solid 0.4.5
• Options contain CJK (Chinese) labels and descriptions

Symptom
In the interactive question tool, when the mouse hovers over an option, the option's own text visually overlaps/covers the gray description text below it. The description also renders truncated/misaligned (e.g. 提供相关代码片段 appears as a garbled fragment like 关代码片段 with the leading chars missing). The "Type your own answer" row sometimes shows its text twice, suggesting residual/leftover frame content.

Reproduction pattern: it happens "sometimes" — not every time — and only in the real terminal session, not reproducible in headless tests.

What I investigated

1. Rendering code: packages/tui/src/routes/session/question.tsx (lines ~369-395). Each option is a box (default flexDirection: column) containing a flexDirection="row" label line plus a paddingLeft={3} description line. Layout structure looks correct.
2. parseFlexDirection(undefined) defaults to FlexDirection.Column in @opentui/core, so vertical stacking is expected.
3. I wrote headless reproduction tests against sst/opentui main (solid testRender + native renderer + mockMouse.moveTo simulating real hover, capturing char frames and spans): no overlap, no truncation, no residual text in any frame. Layout and native rendering logic appear fine in isolation.
4. The bug only shows in the real terminal, and only intermittently — this points to incremental diff re-rendering on onMouseOver (background color change only) interacting with CJK wide-character width handling in the real terminal output path.

Hypothesis

• Likely the incremental re-render on hover (background color change) has a redraw-region calculation issue when CJK wide chars are involved, or leftover-frame artifacts in the native span feed when only the background changes.
• Could also be terminal-specific interpretation of emitted ANSI sequences.

Request

• Confirm whether this is a known rendering issue.
• I can provide terminal type details and a screen recording of the hover behavior if useful.