- thread-sidebar: fix Collapsible chevron CSS selector to use descendant
combinator instead of direct child (folder chevron now rotates correctly)
- prompt-library-sheet: use split/join instead of replaceAll to avoid
JavaScript replacement string $-specials in variable substitution
- prompt-library-sheet: fix tooltip to say "Copy to clipboard" (matches
actual behavior), remove unused handleStartCreate callback
- thread-sidebar: remove unused FolderRecord import
- markdown-text: remove unused useCallback import