[WaylandYang]

Symptom

While documents are being extracted, the graph page refetches graph/overview over and over. Right after uploading three short documents to a fresh base, the network panel showed 16 identical overview requests within a couple of seconds. Each extracted fact emits a graph event, and useKbEvents invalidated the query on every one of them.

Change

useKbEvents no longer invalidates on each event. It records the affected query keys and flushes them once the stream has been quiet for 300 ms, so a burst of events costs one refetch, and that refetch necessarily includes every change in the burst. Idempotence is unchanged; only the cadence is. On unmount the pending keys are flushed rather than dropped, so coming back to a page still shows fresh data.

Verification

A/B on the same backend with both frontends open on the graph page of the same base, then one document uploaded:

	overview requests after the upload
dev	8 (two bursts of 4, at ~25 s and ~57 s)
this branch	4 (each burst collapsed to the document event and the graph events that followed two seconds later)

A cold load of the graph page still issues exactly one request. pnpm build passes.

No issue was filed for this; it was noticed while testing #259.

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