fix: show microsecond precision in borg diff when timestamps differ only at sub-second level (fixes #9147)#9561

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hiepau1231 wants to merge 6 commits intoborgbackup:masterfrom

hiepau1231:fix/bsd-hardlink-diff-timestamp-9147

Commits on Apr 5, 2026

feat: add format_timestamp_pair() for sub-second aware diff timestamp display

hiepau1231
and
claude
committed
refactor: use replace(microsecond=0) in format_timestamp_pair for clarity
hiepau1231
committed
fix: DiffFormatter.format_time() uses microsecond precision for sub-second timestamp diffs

hiepau1231
and
claude
committed
test: add control-case test and fix import in parseformat_test
hiepau1231
committed
fix: re-enable test_hard_link_deletion_and_replacement on FreeBSD/NetBSD

hiepau1231
and
claude
committed
fix: include OpenBSD in BSD ctime conditional in diff test
hiepau1231
committed