fix(charts): split medication-compliance empty-state copy on scheduled doses

Mirrors the health-chart and mood-chart fixes. The compliance payload
already carries `scheduled` per day; summing it yields the raw
scheduled-dose count for the window. When the chart aggregates to
< 3 daily buckets but the raw count is ≥ 3, paint the new
"More distinct days needed" copy so the next action matches reality.

Pin both branches with an SSR test that mocks the compliance fetch.

src/components/charts/__tests__/medication-compliance-chart-empty-state-gate.test.tsx

@@ -0,0 +1,93 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { renderToStaticMarkup } from "react-dom/server";
+
+/**
+ * v1.4.43 W2-CHART-GATE — medication-compliance empty-state copy split.
+ *
+ * The chart aggregates per-day compliance buckets, so a user with 20
+ * scheduled doses on 2 calendar days collapses to `chartData.length =
+ * 2`. The pre-v1.4.43 "log more measurements" hint misled — they
+ * logged plenty, just on too few days. The gate now keys on
+ * `rawCount = Σ scheduled` so the second message paints whenever the
+ * user has enough raw doses but the chart is < 3 buckets wide.
+ */
+
+vi.mock("@/hooks/use-auth", () => ({
+  useAuth: () => ({
+    isAuthenticated: true,
+    user: null,
+    isLoading: false,
+  }),
+}));
+
+describe("<MedicationComplianceChart> — empty-state gate by raw count", () => {
+  beforeEach(() => {
+    vi.resetModules();
+  });
+
+
+  it("renders need-more-days copy when chartData.length < 3 but rawCount >= 3", async () => {
+    const data = [
+      { date: "2026-05-19", scheduled: 10, taken: 8 },
+      { date: "2026-05-20", scheduled: 10, taken: 9 },
+    ];
+
+    vi.doMock("@tanstack/react-query", () => ({
+      useQuery: () => ({ data, isLoading: false }),
+      useQueryClient: () => ({
+        cancelQueries: () => Promise.resolve(),
+        getQueryData: () => undefined,
+        setQueryData: () => undefined,
+        invalidateQueries: () => Promise.resolve(),
+      }),
+      useMutation: () => ({ mutate: () => undefined, isPending: false }),
+    }));
+
+    const { I18nProvider } = await import("@/lib/i18n/context");
+    const { MedicationComplianceChart } = await import(
+      "../medication-compliance-chart"
+    );
+
+    const html = renderToStaticMarkup(
+      <I18nProvider initialLocale="de">
+        <MedicationComplianceChart />
+      </I18nProvider>,
+    );
+
+    expect(html).toContain("Mehr Messtage erforderlich");
+    expect(html).not.toContain("Erfasse mindestens 3 Einträge");
+
+    vi.doUnmock("@tanstack/react-query");
+  });
+
+  it("renders no-data copy when rawCount < 3", async () => {
+    const data = [{ date: "2026-05-20", scheduled: 1, taken: 1 }];
+
+    vi.doMock("@tanstack/react-query", () => ({
+      useQuery: () => ({ data, isLoading: false }),
+      useQueryClient: () => ({
+        cancelQueries: () => Promise.resolve(),
+        getQueryData: () => undefined,
+        setQueryData: () => undefined,
+        invalidateQueries: () => Promise.resolve(),
+      }),
+      useMutation: () => ({ mutate: () => undefined, isPending: false }),
+    }));
+
+    const { I18nProvider } = await import("@/lib/i18n/context");
+    const { MedicationComplianceChart } = await import(
+      "../medication-compliance-chart"
+    );
+
+    const html = renderToStaticMarkup(
+      <I18nProvider initialLocale="de">
+        <MedicationComplianceChart />
+      </I18nProvider>,
+    );
+
+    expect(html).toContain("Erfasse mindestens 3 Einträge");
+    expect(html).not.toContain("Mehr Messtage erforderlich");
+
+    vi.doUnmock("@tanstack/react-query");
+  });
+});

src/components/charts/medication-compliance-chart.tsx

@@ -252,6 +252,21 @@ export function MedicationComplianceChart({
     [data, tzFmt],
   );
 
+  // v1.4.43 W2-CHART-GATE — raw scheduled-dose count across every day
+  // in the window. The chart bucket aggregates per-day compliance, so
+  // a user with 20 scheduled doses on 2 calendar days collapses to
+  // `chartData.length = 2`. Sum the `scheduled` field across the raw
+  // daily points so the empty-state gate can distinguish "no doses
+  // tracked" from "doses tracked but on too few days".
+  const rawCount = useMemo<number>(() => {
+    if (!data?.length) return 0;
+    return data.reduce(
+      (acc, point) =>
+        acc + (Number.isFinite(point.scheduled) ? point.scheduled : 0),
+      0,
+    );
+  }, [data]);
+
   // v1.4.16 A6 — 7-day trend chip. Computed off the *full* range so a
   // user toggled to "7 days" still sees a trend (which would otherwise
   // be empty if we only used the visible window). The 14-day cap inside
@@ -391,10 +406,23 @@ export function MedicationComplianceChart({
       ) : chartData.length < 3 ? (
         // v1.4.16 B1a — sparse-data placeholder consistent with the
         // BP/weight/pulse/mood charts.
-        <ChartEmptyState
-          title={t("charts.emptyStateTitle")}
-          description={t("charts.emptyStateDescription")}
-        />
+        //
+        // v1.4.43 W2-CHART-GATE — split the copy on the raw scheduled-
+        // dose count. A user with 20 scheduled doses on 2 calendar
+        // days has `chartData.length = 2`; the legacy "log more" hint
+        // misled — they logged plenty, just on too few days. Surface
+        // "need more days" when the raw count is already enough.
+        rawCount >= 3 ? (
+          <ChartEmptyState
+            title={t("charts.needMoreDistinctDaysTitle")}
+            description={t("charts.needMoreDistinctDaysDescription")}
+          />
+        ) : (
+          <ChartEmptyState
+            title={t("charts.emptyStateTitle")}
+            description={t("charts.emptyStateDescription")}
+          />
+        )
       ) : (
         <div className="h-[var(--chart-height,240px)] md:h-[var(--chart-height-md,280px)] touch-pan-y">
           <ResponsiveContainer width="100%" height="100%">