ALL-1949: Duplicates tab on contacts page — tab nav + badge count
completedAdd tab navigation to ContactsPage linking to /contacts/duplicates page with active duplicate count badge. Update DuplicateCandidatesPage to show the same tab nav. Create ContactsTabNav.tsx and useDuplicateCandidateCount hook.
Event Timeline
created
status_change
queued → in_progress
failed
lease expired — re-queued for retry
in_progress → queued
status_change
queued → in_progress
failed
lease expired — re-queued for retry
in_progress → queued
status_change
queued → in_progress
failed
lease expired — max retries reached, marking failed (poison pill)
in_progress → failed
status_change
failed → completed