fix(insights): draw the blood-pressure zones from the record's resolved band

The blood-pressure chart rebuilt its target zones in the browser from the
signed-in account's date of birth. A band the person had set themselves never
reached the chart, and inside a shared or managed record the zones followed
the viewer's age instead of the record's.

The targets payload already resolves for the record on screen. Its blood-
pressure card now honours the user's own band too (labelled Custom, like the
weight card), and the chart reads its zones from that card, so the chart and
the reference panel under it name one band.

src/app/insights/blood-pressure/page.tsx

@@ -18,7 +18,7 @@ import { MetricStatStrip } from "@/components/insights/metric-stat-strip";
 import { CoachReadStrip } from "@/components/insights/derived/coach-read-strip";
 import { MetricTargetSummary } from "@/components/insights/metric-target-summary";
 import { SubPageShell } from "@/components/insights/sub-page-shell";
-import { getBpTargets } from "@/lib/analytics/bp-targets";
+import { useBpTargetBand } from "@/lib/queries/use-bp-target-band";
 
 /**
  * v1.4.25 W4 — `/insights/blood-pressure`.
@@ -26,7 +26,8 @@ import { getBpTargets } from "@/lib/analytics/bp-targets";
  * Routed Blood-Pressure sub-page. The mother page hosts the overview
  * (hero + briefing + advisor); this page concentrates on BP-only depth:
  * the BP chart with its chart-cog overlays, the per-section AI
- * assessment, and the chart's target zones tied to the user's age.
+ * assessment, and the chart's target zones — the band the server resolved
+ * for the record on screen (the user's own target, else the age default).
  *
  * v1.4.27 F17 — when the user has zero BP observations, the page
  * short-circuits to an empty-state CTA pointing at
@@ -57,6 +58,7 @@ export default function InsightsBlutdruckPage() {
   // series at once: the single chart reports per-type visible-range stats and
   // each strip column reads its own half.
   const { statsByType, onVisibleStats } = useChartDomainStats();
+  const bpTargets = useBpTargetBand();
 
   if (isEmpty) {
     return (
@@ -82,13 +84,11 @@ export default function InsightsBlutdruckPage() {
     );
   }
 
-  const bpTargets =
-    user?.dateOfBirth != null ? getBpTargets(new Date(user.dateOfBirth)) : null;
   const bpTargetZones = bpTargets
     ? [
         {
-          min: bpTargets.sysLow,
-          max: bpTargets.sysHigh,
+          min: bpTargets.systolic.min,
+          max: bpTargets.systolic.max,
           color: "var(--chart-3)",
           opacity: 0.21,
           label: t("charts.systolic"),
@@ -96,8 +96,8 @@ export default function InsightsBlutdruckPage() {
           lineOpacity: 0.24,
         },
         {
-          min: bpTargets.diaLow,
-          max: bpTargets.diaHigh,
+          min: bpTargets.diastolic.min,
+          max: bpTargets.diastolic.max,
           color: "var(--info)",
           opacity: 0.21,
           label: t("charts.diastolic"),