Fix full-width character alignment#1593
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Summary
Fix incorrect caret alignment in error context rendering when input contains full-width Unicode characters (e.g. Chinese characters).
Previously, caret positioning used character length (
len()), which does not reflect terminal display width for full-width characters.This caused misaligned error indicators in
UnexpectedInput.get_context().Changes
Testing
Notes
No external dependencies added. Uses Python standard library only.