feat(insights): wire CorrelationRow + TrendsRow into /insights

Compute the three pre-defined correlation hypotheses
(BP × compliance, mood × pulse, weight × weekday) on the trailing
30-day window in `/api/analytics` and surface the typed result
shapes on the response payload. Each runner is gated on n >= 14
+ p < 0.05; below the bar the result.status === "insufficient"
and the per-card EmptyState paints in place of a misleading
near-zero scatter.

The insights page now mounts:

- `<CorrelationRow>` between the Daily Briefing and the Advisor
  card — the layout slot the artboard reserves for the patterns
  surface.
- `<TrendsRow>` immediately below it, fed from
  `advisor.payload.trendAnnotations` (lifted client-side via
  `trendAnnotationsSchema.safeParse`). Legacy cached payloads
  predating PROMPT_VERSION 4.20.1 surface the per-metric
  empty-state hint instead of a half-rendered annotation.

The wide-event annotation captures per-hypothesis status so admin
observability can attribute coverage gaps without re-querying
the DB.

10 source-scan tests pin the load-bearing imports, the JSX mounts,
the analytics-route surfacing, and the malformed-payload null
fallback in the advisor hook.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/insights/use-insights-advisor.ts

@@ -4,7 +4,9 @@ import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
 import type { InsightResult } from "@/lib/ai/types";
 import {
   dailyBriefingSchema,
+  trendAnnotationsSchema,
   type DailyBriefing as DailyBriefingPayload,
+  type TrendAnnotations,
 } from "@/lib/ai/schema";
 import { queryKeys } from "@/lib/query-keys";
 
@@ -39,6 +41,12 @@ export interface InsightAdvisorPayload {
    * malformed payload from poisoning the briefing card.
    */
   dailyBriefing?: DailyBriefingPayload | null;
+  /**
+   * v1.4.20 phase B3 — optional trend annotations for the Trends row.
+   * Same lift-pattern as `dailyBriefing` — validated client-side and
+   * left null when the cached payload predates PROMPT_VERSION 4.20.1.
+   */
+  trendAnnotations?: TrendAnnotations | null;
 }
 
 async function fetchAdvisor(
@@ -77,6 +85,19 @@ async function fetchAdvisor(
   } else {
     payload.dailyBriefing = null;
   }
+
+  // v1.4.20 phase B3 — same lift for `trendAnnotations`. Cached payloads
+  // from the 4.20.0 line predate the field, so null is the expected
+  // default. A malformed candidate also resolves to null so the UI
+  // surfaces the per-metric empty hint instead of a half-rendered card.
+  const annotationsCandidate = (payload?.insights as Record<string, unknown>)
+    ?.trendAnnotations;
+  if (annotationsCandidate != null) {
+    const parsed = trendAnnotationsSchema.safeParse(annotationsCandidate);
+    payload.trendAnnotations = parsed.success ? parsed.data : null;
+  } else {
+    payload.trendAnnotations = null;
+  }
   return payload;
 }