fix(labs): converge the lab tile + loading onto the shared primitives

The lab list shipped a second bespoke compact-tile shape and a
centred Loader2 that disagreed in size with the page spinner above it.

- Lab cards now title themselves with CardHeader/CardTitle and pin the
  sparkline + delete control in CardAction, matching the canonical card
  contract; the py-4 content override is dropped so the card token
  drives spacing.
- Loading paints a tile-shaped Skeleton stack via the shared primitive
  instead of the bespoke spinner, removing the size drift and the
  layout pop-in.

src/components/labs/__tests__/lab-list-loading.test.tsx

@@ -0,0 +1,44 @@
+import { describe, it, expect, vi } from "vitest";
+import { renderToStaticMarkup } from "react-dom/server";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+
+import { I18nProvider } from "@/lib/i18n/context";
+
+/**
+ * v1.17.1 — the lab list's loading affordance.
+ *
+ * Audit 02-H2/L2: the list used a bespoke centred `<Loader2>` (a different
+ * spinner size than the page above it). The fix paints a tile-shaped
+ * `Skeleton` stack via the shared primitive so labs / recovery / sleep-quality
+ * share one loading dialect. On first synchronous render the query is pending,
+ * so the skeleton branch shows.
+ */
+
+vi.mock("@/lib/api/api-fetch", () => ({
+  // Never resolves within the synchronous SSR render → query stays loading.
+  apiGet: () => new Promise(() => {}),
+  apiDelete: vi.fn(),
+}));
+
+import { LabList } from "../lab-list";
+
+function render(node: React.ReactNode) {
+  const queryClient = new QueryClient({
+    defaultOptions: { queries: { retry: false } },
+  });
+  return renderToStaticMarkup(
+    <QueryClientProvider client={queryClient}>
+      <I18nProvider initialLocale="en">{node}</I18nProvider>
+    </QueryClientProvider>,
+  );
+}
+
+describe("<LabList> loading", () => {
+  it("paints the shared Skeleton stack while loading", () => {
+    const html = render(<LabList />);
+    expect(html).toContain('data-slot="lab-list-loading"');
+    expect(html).toContain('data-slot="skeleton"');
+    // No bespoke spinner anymore.
+    expect(html).not.toContain("animate-spin");
+  });
+});

src/components/labs/lab-list.tsx

@@ -2,12 +2,19 @@
 
 import { useMemo } from "react";
 import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
-import { FlaskConical, Loader2, Trash2 } from "lucide-react";
+import { FlaskConical, Trash2 } from "lucide-react";
 import { toast } from "sonner";
 
 import { Button } from "@/components/ui/button";
-import { Card, CardContent } from "@/components/ui/card";
+import {
+  Card,
+  CardAction,
+  CardContent,
+  CardHeader,
+  CardTitle,
+} from "@/components/ui/card";
 import { EmptyState } from "@/components/ui/empty-state";
+import { Skeleton } from "@/components/ui/skeleton";
 import { apiDelete, apiGet } from "@/lib/api/api-fetch";
 import { formatDate } from "@/lib/format";
 import { useTranslations } from "@/lib/i18n/context";
@@ -104,8 +111,18 @@ export function LabList({ onAddFirst }: { onAddFirst?: () => void } = {}) {
 
   if (isLoading) {
     return (
-      <div className="flex h-48 items-center justify-center">
-        <Loader2 className="text-primary h-6 w-6 animate-spin motion-reduce:animate-none" />
+      <div className="space-y-3" data-slot="lab-list-loading">
+        {Array.from({ length: 3 }, (_, i) => (
+          <Card key={i} aria-hidden="true">
+            <CardContent className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
+              <div className="min-w-0 space-y-2">
+                <Skeleton className="h-4 w-40" />
+                <Skeleton className="h-3 w-56" />
+              </div>
+              <Skeleton className="h-8 w-24 self-end sm:self-center" />
+            </CardContent>
+          </Card>
+        ))}
       </div>
     );
   }
@@ -137,49 +154,18 @@ export function LabList({ onAddFirst }: { onAddFirst?: () => void } = {}) {
     <div className="space-y-3">
       {groups.map((group) => (
         <Card key={group.analyte.toLowerCase()}>
-          <CardContent className="flex flex-col gap-3 py-4 sm:flex-row sm:items-center sm:justify-between">
-            <div className="min-w-0 space-y-1">
-              <div className="flex flex-wrap items-baseline gap-x-2 gap-y-1">
-                <span className="font-medium">{group.analyte}</span>
-                {group.panel ? (
-                  <span className="text-muted-foreground text-xs">
-                    {group.panel}
-                  </span>
-                ) : null}
-                <ReferenceRangeBadge status={group.latest.rangeStatus} />
-              </div>
-              <div className="text-muted-foreground flex flex-wrap items-center gap-x-2 text-sm">
-                <span className="text-foreground font-semibold tabular-nums">
-                  {formatValue(group.latest.value)} {group.latest.unit}
+          <CardHeader>
+            <CardTitle className="flex flex-wrap items-baseline gap-x-2 gap-y-1 text-sm">
+              <span className="font-medium">{group.analyte}</span>
+              {group.panel ? (
+                <span className="text-muted-foreground text-xs font-normal">
+                  {group.panel}
                 </span>
-                {group.latest.referenceLow !== null ||
-                group.latest.referenceHigh !== null ? (
-                  <span className="text-xs">
-                    {t("labs.referenceLabel")}{" "}
-                    {group.latest.referenceLow !== null &&
-                    group.latest.referenceHigh !== null
-                      ? `${formatValue(group.latest.referenceLow)}–${formatValue(group.latest.referenceHigh)}`
-                      : group.latest.referenceHigh !== null
-                        ? `≤ ${formatValue(group.latest.referenceHigh)}`
-                        : `≥ ${formatValue(group.latest.referenceLow as number)}`}
-                  </span>
-                ) : null}
-                <span className="text-xs">
-                  {formatDate(group.latest.takenAt)}
-                </span>
-                {group.readings.length > 1 ? (
-                  <span className="text-xs">
-                    {t("labs.readingsCount", {
-                      count: group.readings.length,
-                    })}
-                  </span>
-                ) : null}
-              </div>
-            </div>
-            <div className="flex items-center gap-3 self-end sm:self-center">
-              <LabTrendSparkline
-                values={group.readings.map((r) => r.value)}
-              />
+              ) : null}
+              <ReferenceRangeBadge status={group.latest.rangeStatus} />
+            </CardTitle>
+            <CardAction className="flex items-center gap-3">
+              <LabTrendSparkline values={group.readings.map((r) => r.value)} />
               <Button
                 variant="ghost"
                 size="icon"
@@ -190,6 +176,35 @@ export function LabList({ onAddFirst }: { onAddFirst?: () => void } = {}) {
               >
                 <Trash2 className="h-4 w-4" />
               </Button>
+            </CardAction>
+          </CardHeader>
+          <CardContent>
+            <div className="text-muted-foreground flex flex-wrap items-center gap-x-2 text-sm">
+              <span className="text-foreground font-semibold tabular-nums">
+                {formatValue(group.latest.value)} {group.latest.unit}
+              </span>
+              {group.latest.referenceLow !== null ||
+              group.latest.referenceHigh !== null ? (
+                <span className="text-xs">
+                  {t("labs.referenceLabel")}{" "}
+                  {group.latest.referenceLow !== null &&
+                  group.latest.referenceHigh !== null
+                    ? `${formatValue(group.latest.referenceLow)}–${formatValue(group.latest.referenceHigh)}`
+                    : group.latest.referenceHigh !== null
+                      ? `≤ ${formatValue(group.latest.referenceHigh)}`
+                      : `≥ ${formatValue(group.latest.referenceLow as number)}`}
+                </span>
+              ) : null}
+              <span className="text-xs">
+                {formatDate(group.latest.takenAt)}
+              </span>
+              {group.readings.length > 1 ? (
+                <span className="text-xs">
+                  {t("labs.readingsCount", {
+                    count: group.readings.length,
+                  })}
+                </span>
+              ) : null}
             </div>
           </CardContent>
         </Card>