* fix(control-ui-assets): keep emoji / surrogate pairs intact during last-line truncation
.slice(0, 239) counts UTF-16 code units; an emoji straddling the
cut point produces a lone surrogate rendering as in WebUI assets.
Use [...last] spread to count full code points instead.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
* fix(control-ui-assets): preserve diagnostic length cap
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Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Co-authored-by: Peter Steinberger <steipete@gmail.com>
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