chore(release): v1.28.20 — estimated drug level in efficacy + insights

The GLP-1 estimated active-substance curve (the modelled drug level from logged
doses) now also renders in the efficacy (Wirkung) tab and in the Insights
medication overview, not only under the injection tab. Both reuse the same
self-contained DrugLevelChart, gated on the GLP-1 treatment class, so the drug
level sits next to the efficacy readouts. Additive — no existing surface changes;
non-GLP-1 medications render nothing.

src/app/insights/medications/page.tsx

@@ -18,6 +18,7 @@ import { CoachLaunchButton } from "@/components/insights/coach-launch-button";
 import { InsightStatusCard } from "@/components/insights/insight-status-card";
 import { MetricTargetSummary } from "@/components/insights/metric-target-summary";
 import { MedicationEfficacySummary } from "@/components/insights/medication-efficacy-summary";
+import { Glp1SubstanceCurveSummary } from "@/components/insights/glp1-substance-curve-summary";
 import { SubPageShell } from "@/components/insights/sub-page-shell";
 import { TileHeader } from "@/components/insights/tile-header";
 import { apiGet } from "@/lib/api/api-fetch";
@@ -288,6 +289,16 @@ export default function InsightsMedikamentePage() {
         medications={medications.map((m) => ({ id: m.id, name: m.name }))}
       />
 
+      {/* v1.28.20 — estimated active-substance curve for GLP-1 medications
+          (additive; renders nothing when the user has no GLP-1 medication). */}
+      <Glp1SubstanceCurveSummary
+        medications={medications.map((m) => ({
+          id: m.id,
+          name: m.name,
+          dose: m.dose,
+        }))}
+      />
+
       <MetricTargetSummary slug="medications" />
 
       {/* v1.12.2 — the assessment is the LAST block on every bespoke