Improve or change an existing UI plugin
Call acryl_list_plugins to find the package directory, then read its client.js completely and {{pack}}/docs/extending/client-slot.md. Edit in place: keep the wrapper id, keep exports, keep the localStorage key so the user's data survives. Prefer small edits over rewrites. Keep no-build rules (createElement, require, no JSX/import). Run acryl_verify_plugin, then acryl_install_plugin again (it updates in place) and ask the user to reload the page or window. Tell the user exactly what changed.