Add retention and GC for acked offline sync records

[RUKAYAT-CODER]

Background

Acknowledged sync records are never purged from IndexedDB and accumulate indefinitely. Add a retention/GC policy.

Files to modify (2-3)

src/services/offlineSync.ts
src/store/persistenceLayer.ts

Acceptance Criteria

Implemented across the listed files

Unit/integration tests added or updated and passing

No regression; follows project coding standards

[dee-john]

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i’m very conversant in solving problems like this, let me work on it

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[OkpunTakem]

@OkpunTakem has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I can fix this.

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[kaizercodes]

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Can I work on this

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[morenike69]

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I would like to work on this issue, please assign it to me.

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[entitydev30]

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Kindly assign me to this issue

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[BestBisong]

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I have experience in solving issues like this pls assign it to me ETA 1hr

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[Cybermaxi7]

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Hi Maintainer, can i handle this?

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[ogunjobielijah09-cyber]

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I would like to work on this issue, please assign it to me.

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[Audukuma]

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Can I work on this issue

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[OpensrcLord]

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Hello @maintainer, I'd love to work on this issue. I'll keep the implementation simple, clean, and well-tested.

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[Priyanshu1-62]

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Hi maintainers,
Please assign this issue to me.

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[Adjutant500]

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Hi Maintainer please I will like to work on this issue

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