Trigger an AI optimize panel from a text selection in the KOL prompt
editor, accept a user instruction, and stream a preview before replacing
the selected fragment. Extend the shared editor AI assist panel with
boundary-aware placement so it can be hosted inside scoped surfaces, and
update the backend optimize prompt to honor the user instruction.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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