Part 1 (#542): add an inline Undo (reopen) button to the resolve success
toast in useResolveCommentMutation. Undo re-invokes the same mutation via a
self-ref (declared before useMutation, read at click time — no cycle) and
clears the inline comment mark through an editor ref (survives the originating
CommentListItem unmounting). A closured `done` flag guards a fast double-click
(notifications.hide is async). Reopen keeps the plain toast (no Undo).
onError gains a terminal 404 branch: drop the comment from the cache and
unsetComment its orphaned mark (no rollback → no phantom in Resolved, neutral
"Comment no longer exists"). The generic-failure copy is now directional
(resolve vs. re-open). Autoclose policy const RESOLVE_UNDO_AUTOCLOSE_MS=10000.
Part 2: sort the Resolved tab by resolvedAt DESC via an exported
sortResolvedByResolvedAt helper; coerce with new Date(...) because resolvedAt
is an ISO string at runtime (Date only in the optimistic window).
i18n: add "Failed to re-open comment" and "Comment no longer exists" to
en-US/ru-RU. Tests: 6 resolve-undo cases + 4 sort cases.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
agent_coder
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