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Felix #5: TranscriptionBlock had a `\$effect(() => { void localText; ... })` hack to re-trigger autoresize on text change, plus a captureTextarea callback that the parent only used to size a node it didn't own. The editor owns the textarea — it should also size it. Move the autoresize \$effect into PersonMentionEditor so the parent only captures the node when it genuinely needs to read selection bounds (quote selection still works). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>