Analytics: time-range/granularity controls + worker-backed incremental aggregation

[NuMziE26]

Summary

Analytics: time-range/granularity controls + worker-backed incremental aggregation

What was solved

#462 — [High] Add time-range and granularity controls to Analytics with correct UTC bucketing

Add user-selectable time ranges (24h/7d/30d/90d/custom) and granularity (hour/day/week) to the Analytics page, refactoring computeAnalytics into a pure, time-injected function that buckets by UTC via explicit helpers, fills gaps with zeros, counts and surfaces ignored invalid timestamps, syncs selection to the URL, shows a data-completeness notice when the capped feed doesn't cover the range, and documents the timezone policy with a local-time axis-label toggle.

Addressed:

• Changed: src/lib/time.ts, src/lib/analytics.ts, src/lib/time.ts
• Make computeAnalytics(intents, {from, to, granularity, now}) pure with injected time (no Date.now() inside)
• Bucket by UTC using explicit helpers (startOfUtcHour/Day/Week) in src/lib/time.ts, with correct ISO-week handling across year boundaries
• Fill empty buckets with zeros and reject/ignore invalid timestamps, surfacing counts of ignored rows in the UI

#463 — [High] Move heavy analytics computation off the main thread with a Web Worker and memoized incremental updates

Move the heavy computeAnalytics aggregation off the main thread by introducing a shared incremental aggregator core, a Web Worker wrapper exposing init/apply/snapshot over a typed message protocol, and wiring the analytics page to render from worker snapshots with deferred/transition semantics, while falling back to synchronous computation when Worker is unavailable.

Addressed:

• Changed: src/lib/analytics.ts, src/lib/analytics/worker.ts, src/app/analytics/AnalyticsPageClient.tsx
• Create a shared incremental aggregator class with add/update/remove (insert, status change, eviction) that both the sync API and the worker wrap.
• Add a new Web Worker module exposing init(intents, options), apply(delta) and snapshot() over a typed message protocol.
• Refactor src/lib/analytics.ts so computeAnalytics delegates to the same core aggregator, preserving the existing public API and output shape.

Changes

• src/lib/time.ts (modify)
• src/lib/analytics.ts (modify)
• src/lib/analytics/worker.ts (create)
• src/app/analytics/AnalyticsPageClient.tsx (modify)

Approach

1. [High] Add time-range and granularity controls to Analytics with correct UTC bucketing #462 — [High] Add time-range and granularity controls to Analytics with correct UTC bucketing (Changed: src/lib/time.ts, src/lib/analytics.ts, src/lib/time.ts)
2. [High] Move heavy analytics computation off the main thread with a Web Worker and memoized incremental updates #463 — [High] Move heavy analytics computation off the main thread with a Web Worker and memoized incremental updates (Changed: src/lib/analytics.ts, src/lib/analytics/worker.ts, src/app/analytics/AnalyticsPageClient.tsx)

Issues

Closes #462
Closes #463

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