fix: prevent E2EE metadata rollback #9426
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Persist counters and key checksums so clients can reject downgraded metadata. Signed-off-by: Yaroslav98214 <diakovichyaroslav30@gmail.com>
Yaroslav98214
requested review from
Aiiaiiio,
camilasan,
i2h3,
mgallien and
nilsding
as code owners
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Summary: Validate E2EE metadata counter and keyChecksums; persist values in journal; add regression tests.
Tests: Not run (requires KF6Archive + Qt 6.8+).