Status analytics code-quality follow-ups (checklist)

[kylebernhardy]

Smaller items from the Status tab review, bundled:

• Gratuitous as any casts that compile fine without them (AnalyticsDataPoint already has an unknown index signature): pipeline.ts:99,105,151,343, connection.tsx:67-78; plus TrafficByTypeRenderer.tsx:164 yAxis={spec.yAxis as any} — narrow MetricSpec so stacked-area specs carry AxisSpec rather than the dual-axis union.
• Replication perf: buildLineSeries re-scans all records per surviving cell and parseReplicationPath re-sorts knownNodes per record (O(cells × records × n log n)) — parse once and hoist the sort (replication-latency.tsx, pathParser.ts:31).
• Replication confidence thresholds {greyBelow: 40, suppressBelow: 100} hardcoded in four places in replication-latency.tsx (:37, :116, :169, :315) — one constant; the spec even carries a TODO about re-tuning them.
• Dead/unread spec fields that mislead spec authors: bucket.source is never read (two of its three variants unimplemented — narrow the type) and confidence.field is populated by every spec but the pipeline hardcodes r.count (types/analytics.ts:154,159, pipeline.ts:158,196-201).
• AnalyticsOnboardingHint.tsx:47 claims "heatmap cells are clickable for drilldown" — they aren't (no handler, cursor: default). Reword, or close via the drilldown enhancement issue.
• FallbackRenderer.tsx:69 maps records lacking time to x: 0 (plots at 1970, drags the x-domain back 56 years); also declares unused window/nodes props.
• AnalyticsContext.tsx:23-30 re-memoizes an already-memoized value keyed on entityId only — a replaced instanceClient for the same entity keeps a stale client. Pass the value through.
• OverviewTab.tsx:17-23 uses useSuspenseQuery with no error boundary — wrap like the chart tabs do.
• StatusTabs.tsx:112 void tick; memo hack — a refreshEpoch state holding the timestamp is clearer (may be subsumed by the frozen-window fix).
• useAnalyticsRecords.ts:64-67 comment says "startup jitter" but the jitter is added to the recurring interval — fix the comment or implement an initial-delay stagger.
• StorageTab.tsx:73,156 — hardcoded rankBy, dead onRankChange={() => {}} prop, and an import placed below a function declaration.
• HeatmapMatrix.tsx:138-139 legend hardcodes "p95 latency" copy in a generically-named primitive — take the measure label from data.axis/a prop.
• lib/crawlData.ts is a generic object walker used only by OverviewTab, with magic heuristics (startOf2025 timestamp sniffing, parentName === 'memory') — move nearer its caller.

Filed from a Status tab code review.

Comment generated by kAIle (Claude Fable 5)