fix(insights): row-fill rule + equal-height trends + hide-on-insufficient-data

Three layout problems landed together because they share the same
root: the `/insights` grids assumed every row would be full, so when a
section dropped a card the layout left a half-row of empty space.

  - Row-fill rule: every grid on `/insights` now picks `xl:grid-cols-2`
    only when 2+ cards actually render. With 1 card the grid collapses
    to a single full-width column. The BP-medication grid, the weight-
    correlation grid, and the medications-per-day grid all carried the
    half-empty-row bug; all three are normalised.

  - Trends row equal heights: each `<TrendsRow>` card is now a flex
    column with `min-h-[300px]` so a multi-line AI annotation under one
    chart doesn't push that card taller than its neighbours. The
    visual rhythm holds even when the prose varies in length.

  - Hide insufficient-data correlation tiles: `<CorrelationRow>` drops
    any hypothesis with `status !== "ok"` instead of painting a
    placeholder. When zero hypotheses qualify, the entire row hides
    itself (no header, no disclaimer). 1 ok card spans 100 % width, 2
    or 3 ok cards split 50/50 on `>=md`.

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

src/app/insights/page.tsx

@@ -1060,7 +1060,15 @@ export default function InsightsPage() {
           annotations={bpStoryboardAnnotations}
         />
 
-        <div className="grid gap-4 xl:grid-cols-2">
+        {/* v1.4.22 A4 — row-fill rule: 2 cards → 50/50 (xl), 1 card →
+            100 % width. When the mood section is hidden the BP-medication
+            card collapses to full-width instead of leaving the right
+            half empty. */}
+        <div
+          className={
+            showMoodSection ? "grid gap-4 xl:grid-cols-2" : "grid gap-4"
+          }
+        >
           <Card>
             <CardHeader className="pb-2">
               <div className="flex items-center justify-between">
@@ -1262,7 +1270,13 @@ export default function InsightsPage() {
           compareBaseline={compareBaseline}
         />
 
-        <div className="grid gap-4 xl:grid-cols-2">
+        {/* v1.4.22 A4 — row-fill rule: 2 cards → 50/50 (xl), 1 card →
+            100 % width. Mirrors the BP-section grid normalisation. */}
+        <div
+          className={
+            showMoodSection ? "grid gap-4 xl:grid-cols-2" : "grid gap-4"
+          }
+        >
           <Card>
             <CardHeader className="pb-2">
               <div className="flex items-center justify-between">
@@ -1483,7 +1497,15 @@ export default function InsightsPage() {
         </div>
 
         {data.medications.length > 0 ? (
-          <div className="grid gap-4 sm:grid-cols-2">
+          /* v1.4.22 A4 — row-fill rule: a single medication card fills
+             100 % width instead of half the row. */
+          <div
+            className={
+              data.medications.length >= 2
+                ? "grid gap-4 sm:grid-cols-2"
+                : "grid gap-4"
+            }
+          >
             {data.medications.map((med) => {
               const medicationSummary = medicationSummaryById.get(med.id);
               return (

src/components/insights/__tests__/correlation-row.test.tsx

@@ -5,13 +5,17 @@ import type { CorrelationResult } from "@/lib/insights/correlations";
 
 /**
  * v1.4.20 phase B3 — `<CorrelationRow>` layout + disclaimer.
+ * v1.4.22 A4 update — empty-state cards are dropped instead of rendered.
  *
  * Acceptance:
- *   1. Renders the three hypothesis cards.
- *   2. Mounts the correlation-disclaimer footer once at the row level.
- *   3. 2-up grid on >= md, single column on < md.
- *   4. Below-threshold cards delegate their empty-state to
- *      `<CorrelationCard>` (smoke-checked via the per-card slot).
+ *   1. Renders only the hypothesis cards whose `status === "ok"`.
+ *   2. Mounts the correlation-disclaimer footer once at the row level
+ *      when at least one card renders; the row hides itself entirely
+ *      when zero cards render (no header, no disclaimer).
+ *   3. 2-up grid on >= md when 2+ cards, full-width single column when
+ *      exactly 1 card renders.
+ *   4. Below-threshold cards are filtered at the row level so the
+ *      layout collapses cleanly.
  */
 
 vi.mock("next/dynamic", () => ({
@@ -67,7 +71,7 @@ const okWeightWeekday: CorrelationResult = {
 };
 
 describe("<CorrelationRow>", () => {
-  it("renders all three hypothesis cards", () => {
+  it("renders only the ok-status hypothesis cards (insufficient ones are dropped)", () => {
     const html = render(
       <CorrelationRow
         results={{
@@ -78,9 +82,9 @@ describe("<CorrelationRow>", () => {
       />,
     );
     const matches = html.match(/data-slot="correlation-card"/g) ?? [];
-    expect(matches.length).toBe(3);
+    expect(matches.length).toBe(2);
     expect(html).toMatch(/data-kind="bp-compliance"/);
-    expect(html).toMatch(/data-kind="mood-pulse"/);
+    expect(html).not.toMatch(/data-kind="mood-pulse"/);
     expect(html).toMatch(/data-kind="weight-weekday"/);
   });
 
@@ -99,7 +103,7 @@ describe("<CorrelationRow>", () => {
     expect(html).toContain("Patterns are observational, not causal");
   });
 
-  it("applies the 2-up grid on >= md and single column on < md", () => {
+  it("applies the 2-up grid on >= md when 2+ ok cards render", () => {
     const html = render(
       <CorrelationRow
         results={{
@@ -113,6 +117,36 @@ describe("<CorrelationRow>", () => {
     expect(html).toMatch(/md:grid-cols-2/);
   });
 
+  it("collapses to a full-width single column when exactly 1 ok card renders", () => {
+    const html = render(
+      <CorrelationRow
+        results={{
+          bpCompliance: okBpCompliance,
+          moodPulse: insufficientMoodPulse,
+          weightWeekday: insufficientMoodPulse,
+        }}
+      />,
+    );
+    expect(html).toMatch(/grid-cols-1/);
+    // The 2-up rule must NOT activate when only one card has data —
+    // a single card should span 100 % width on its own row instead of
+    // half-width with empty space next to it.
+    expect(html).not.toMatch(/md:grid-cols-2/);
+  });
+
+  it("hides the row entirely (no header, no disclaimer) when zero cards have data", () => {
+    const html = render(
+      <CorrelationRow
+        results={{
+          bpCompliance: insufficientMoodPulse,
+          moodPulse: insufficientMoodPulse,
+          weightWeekday: insufficientMoodPulse,
+        }}
+      />,
+    );
+    expect(html).toBe("");
+  });
+
   it("renders German copy when locale=de", () => {
     const html = render(
       <CorrelationRow
@@ -124,21 +158,6 @@ describe("<CorrelationRow>", () => {
       />,
       "de",
     );
-    expect(html).toContain("Muster");
     expect(html).toContain("nicht kausal");
   });
-
-  it("delegates empty-state to per-card empty-state when below threshold", () => {
-    const html = render(
-      <CorrelationRow
-        results={{
-          bpCompliance: insufficientMoodPulse,
-          moodPulse: insufficientMoodPulse,
-          weightWeekday: insufficientMoodPulse,
-        }}
-      />,
-    );
-    const matches = html.match(/Need more data to see this pattern/g) ?? [];
-    expect(matches.length).toBe(3);
-  });
 });

src/components/insights/correlation-row.tsx

@@ -7,14 +7,18 @@ import { CorrelationCard } from "./correlation-card";
 /**
  * v1.4.20 phase B3 — Correlation row.
  *
- * Renders the three pre-defined hypothesis cards in a 2-up grid on
- * `>=md` and a single column on `<md`. A single correlation-disclaimer
- * footer sits below the row — the disclaimer applies to every card so
- * we don't repeat it per-card.
+ * Renders the pre-defined hypothesis cards in a 2-up grid on `>=md` and
+ * a single column on `<md`. A single correlation-disclaimer footer sits
+ * below the row — the disclaimer applies to every card so we don't
+ * repeat it per-card.
  *
- * The `<CorrelationCard>` itself owns the empty-state for below-
- * threshold results, so this row never has to filter — it always
- * mounts all three cards regardless of `status`.
+ * v1.4.22 A4 — empty-state cards are dropped instead of rendered. Any
+ * hypothesis whose `status !== "ok"` is filtered out so the layout
+ * collapses cleanly: 2 ok cards → 50/50, 1 ok card → 100 %, 0 ok cards
+ * → the row hides itself entirely (no header, no disclaimer). Up to
+ * v1.4.21 the `<CorrelationCard>` painted an EmptyState for below-
+ * threshold results, which left half-rows of greyed-out placeholders
+ * on a sparse account.
  */
 
 interface CorrelationRowProps {
@@ -28,6 +32,16 @@ interface CorrelationRowProps {
 export function CorrelationRow({ results }: CorrelationRowProps) {
   const { t } = useTranslations();
 
+  // Drop insufficient-data tiles up-front. The grid below picks 1-col vs
+  // 2-col automatically so 1 ok card spans 100 % width on its own row.
+  const okResults = [
+    results.bpCompliance,
+    results.moodPulse,
+    results.weightWeekday,
+  ].filter((r) => r.status === "ok");
+
+  if (okResults.length === 0) return null;
+
   return (
     <section
       data-slot="correlation-row"
@@ -42,10 +56,16 @@ export function CorrelationRow({ results }: CorrelationRowProps) {
           {t("insights.correlationRow.subtitle")}
         </p>
       </div>
-      <div className="grid grid-cols-1 gap-4 md:grid-cols-2">
-        <CorrelationCard result={results.bpCompliance} />
-        <CorrelationCard result={results.moodPulse} />
-        <CorrelationCard result={results.weightWeekday} />
+      <div
+        className={
+          okResults.length === 1
+            ? "grid grid-cols-1 gap-4"
+            : "grid grid-cols-1 gap-4 md:grid-cols-2"
+        }
+      >
+        {okResults.map((result) => (
+          <CorrelationCard key={result.kind} result={result} />
+        ))}
       </div>
       <p
         data-slot="correlation-row-disclaimer"

src/components/insights/trends-row.tsx

@@ -95,8 +95,19 @@ export function TrendsRow({ annotations, confidence }: TrendsRowProps) {
           {t("insights.trendsRow.subtitle")}
         </p>
       </div>
+      {/* v1.4.22 A4 — equal-height cards. The AI annotation prose
+          below each chart varies in length, which used to leave the
+          three cards on visibly different baselines. Each card is now
+          a flex column with `min-h-[300px]` so the chart anchors to
+          the top and the annotation grows downward into a shared
+          minimum height. The grid + min-h together preserve the visual
+          rhythm even on a row where only one annotation is multi-line. */}
       <div className="grid grid-cols-1 gap-4 md:grid-cols-3">
-        <div data-slot="trends-row-card" data-metric="bp" className="space-y-2">
+        <div
+          data-slot="trends-row-card"
+          data-metric="bp"
+          className="flex min-h-[300px] flex-col gap-2"
+        >
           <HealthChart
             types={["BLOOD_PRESSURE_SYS", "BLOOD_PRESSURE_DIA"]}
             title={t("charts.bloodPressure")}
@@ -114,7 +125,7 @@ export function TrendsRow({ annotations, confidence }: TrendsRowProps) {
         <div
           data-slot="trends-row-card"
           data-metric="weight"
-          className="space-y-2"
+          className="flex min-h-[300px] flex-col gap-2"
         >
           <HealthChart
             types={["WEIGHT"]}
@@ -132,7 +143,7 @@ export function TrendsRow({ annotations, confidence }: TrendsRowProps) {
         <div
           data-slot="trends-row-card"
           data-metric="mood"
-          className="space-y-2"
+          className="flex min-h-[300px] flex-col gap-2"
         >
           <MoodChart title={t("charts.mood")} mini />
           <TrendAnnotation