Track the assistant feed scroll position and footer height, and show a
floating button to jump back to the newest message when scrolled up.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Move the large in-code zh-CN/en-US dictionaries out of i18n.tsx and
import them from locales/*.json, shrinking the module and making
translations easier to edit.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>