Broken Rendering for Non-English Languages in OpenCode UI

[Tirth8045]

Description

The OpenCode interface incorrectly renders non-English characters (e.g., Gujarati, Hindi, and other Unicode scripts), causing garbled or overlapping text in the terminal/chat UI. Ensure proper Unicode rendering and font fallback so multilingual text displays correctly without layout issues.

Plugins

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OpenCode version

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Steps to reproduce

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Screenshot and/or share link

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Operating System

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Terminal

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[github-actions]

This issue doesn't fully meet our contributing guidelines.

What needs to be fixed:

• OpenCode version is empty — please provide the version you are using
• Operating System is empty — please specify your OS
• Terminal is empty — please specify your terminal emulator
• Steps to reproduce is empty — please describe what you typed or did to trigger the rendering issue

Please edit this issue to address the above within 2 hours, or it will be automatically closed.

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This issue might be a duplicate of existing issues. Please check:

• Regional language text is not rendering correctly in OpenCode #24581: Regional language text (Hindi/Devanagari) not rendering correctly in OpenCode — very similar symptom and scope
• Thai combining characters miscounted in stringWidth causing TUI prompt misalignment #32067: Thai combining characters miscounted in stringWidth causing TUI layout issues — related Unicode/multi-byte rendering problem

If you believe this was flagged incorrectly, please let a maintainer know.

[github-actions]

This issue has been automatically closed because it was not updated to meet our contributing guidelines within the 2-hour window.

Feel free to open a new issue that follows our issue templates.