Use React Pacer throttler for domain event snapshot sync

- Replace manual timeout-based domain event batching with `Throttler`
- Keep provider query invalidation batched with trailing 100ms flushes
- Cancel throttler and reset invalidation flag during EventRouter cleanup
e765051f14Julius Marminge committed on 3/9/2026, 9:02:29 PM· committed by Julius Marmingeparentf5e4df5
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