fix(measurements): show source badge on mobile card too

The Apple Health pink chip rendered only inside the desktop `<Table>`
cell. iOS users — the audience that actually consumes Apple Health
data — land on the mobile card branch and saw no source indicator at
all, risking duplicate hand-entries on top of synced rows. Add a
compact badge inline with the timestamp on the mobile card so the
distinction lands at every viewport. Component test asserts the
`measurement-source-badge` testid appears twice (desktop + mobile)
so the next layout refactor can't silently drop one branch.

Also extends the `POST /api/devices` unit test mocks for the
NotificationChannel auto-upsert added in the previous commit, plus a
new test that pins the same-user apnsToken collision path returning
201 idempotently (the cross-user path keeps its 409).

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

src/components/measurements/__tests__/measurement-list-apple-health-badge.test.tsx

@@ -85,4 +85,18 @@ describe("MeasurementList — APPLE_HEALTH badge", () => {
     const html = render("de");
     expect(html).toContain("Apple Health");
   });
+
+  it("paints the source badge in BOTH the desktop table and the mobile card", () => {
+    // v1.4.23 W6 design review HIGH-1: the badge previously rendered
+    // only inside the desktop `<Table>` cell. iOS users (the audience
+    // that actually consumes Apple Health data) land on the mobile
+    // card branch and saw no source indicator at all, risking
+    // duplicate hand-entries on top of synced rows. Both branches must
+    // carry the badge so the surface is honest at every viewport.
+    const html = render("en");
+    const matches = html.match(
+      /data-testid="measurement-source-badge"/g,
+    );
+    expect(matches?.length ?? 0).toBe(2);
+  });
 });

src/components/measurements/measurement-list.tsx

@@ -447,6 +447,7 @@ export function MeasurementList({ onEdit, onAddFirst }: MeasurementListProps) {
                         {m.source !== "MANUAL" && (
                           <Badge
                             variant="outline"
+                            data-testid="measurement-source-badge"
                             className={`text-xs ${sourceBadgeClass(m.source)}`.trim()}
                           >
                             {formatMeasurementSource(m.source, t)}
@@ -506,7 +507,16 @@ export function MeasurementList({ onEdit, onAddFirst }: MeasurementListProps) {
                           {m.value} {m.unit}
                         </span>
                         <p className="text-muted-foreground truncate text-xs">
-                          {formatDateTime(m.measuredAt)}
+                          <span>{formatDateTime(m.measuredAt)}</span>
+                          {m.source !== "MANUAL" && (
+                            <Badge
+                              variant="outline"
+                              data-testid="measurement-source-badge"
+                              className={`ml-1.5 h-4 px-1 text-[10px] ${sourceBadgeClass(m.source)}`.trim()}
+                            >
+                              {formatMeasurementSource(m.source, t)}
+                            </Badge>
+                          )}
                         </p>
                         {m.notes && (
                           <p className="text-muted-foreground truncate text-xs">