fix(checkups): say "overdue since yesterday" instead of "overdue by 1 days"

The due phrase on the check-up card and the checkups page counted a
check-up one day past its date as "Overdue by 1 days", and the same
counted form read wrongly in German. One day over now has its own
phrase in all seven languages. Both overdue phrases keep the warning
colour through a shared `isOverdueDue` helper, so a surface no longer
compares against a single key.

messages/de.json

@@ -8527,6 +8527,7 @@
       "inDays": "In {days} Tagen"
     },
     "overdueByDays": "Überfällig seit {days} Tagen",
+    "overdueSinceYesterday": "Überfällig seit gestern",
     "cadence": {
       "everyNDays": "Alle {days} Tage",
       "custom": "Eigener Zeitplan",

messages/en.json

@@ -8527,6 +8527,7 @@
       "inDays": "In {days} days"
     },
     "overdueByDays": "Overdue by {days} days",
+    "overdueSinceYesterday": "Overdue since yesterday",
     "cadence": {
       "everyNDays": "Every {days} days",
       "custom": "Custom schedule",

messages/es.json

@@ -8527,6 +8527,7 @@
       "inDays": "En {days} días"
     },
     "overdueByDays": "Vencido hace {days} días",
+    "overdueSinceYesterday": "Vencido desde ayer",
     "cadence": {
       "everyNDays": "Cada {days} días",
       "custom": "Programación personalizada",

messages/fr.json

@@ -8527,6 +8527,7 @@
       "inDays": "Dans {days} jours"
     },
     "overdueByDays": "En retard de {days} jours",
+    "overdueSinceYesterday": "En retard depuis hier",
     "cadence": {
       "everyNDays": "Tous les {days} jours",
       "custom": "Planning personnalisé",

messages/it.json

@@ -8527,6 +8527,7 @@
       "inDays": "Tra {days} giorni"
     },
     "overdueByDays": "In ritardo di {days} giorni",
+    "overdueSinceYesterday": "In ritardo da ieri",
     "cadence": {
       "everyNDays": "Ogni {days} giorni",
       "custom": "Pianificazione personalizzata",

messages/ko.json

@@ -8527,6 +8527,7 @@
       "inDays": "{days}일 후"
     },
     "overdueByDays": "{days}일 지남",
+    "overdueSinceYesterday": "어제부터 지남",
     "cadence": {
       "everyNDays": "{days}일마다",
       "custom": "사용자 지정 일정",

messages/pl.json

@@ -8527,6 +8527,7 @@
       "inDays": "Za {days} dni"
     },
     "overdueByDays": "Zaległe od {days} dni",
+    "overdueSinceYesterday": "Zaległe od wczoraj",
     "cadence": {
       "everyNDays": "Co {days} dni",
       "custom": "Własny harmonogram",

src/__tests__/vorsorge-due-bucket-single-home-guard.test.ts

@@ -52,6 +52,7 @@ const MINTED_ONLY_BY_THE_BUCKET = [
   "measurementReminders.nextDue.tomorrow",
   "measurementReminders.nextDue.inDays",
   "measurementReminders.nextDue.none",
+  "measurementReminders.overdueSinceYesterday",
 ];
 
 /** The hook that yields the zone the surrounding dates are printed in. */

src/components/measurement-reminders/__tests__/vorsorge-section.test.tsx

@@ -275,7 +275,9 @@ describe("<VorsorgeSection> loading + empty", () => {
     } as MeasurementReminder;
     remindersMock.mockReturnValue({ data: [reminder], isLoading: false });
     const html = render(<VorsorgeSection />);
-    expect(html).toContain("Overdue by 1 days");
+    // One day over reads "since yesterday": the counted form printed
+    // "Overdue by 1 days", and the warning hue must follow both phrases.
+    expect(html).toContain("Overdue since yesterday");
     expect(html).toContain("text-warning");
   });
 

src/components/measurement-reminders/vorsorge-section.tsx

@@ -47,7 +47,10 @@ import {
   useDisplayTimezone,
 } from "@/lib/i18n/context";
 import { relativeCalendarDate } from "@/lib/i18n/relative-time";
-import { relativeDueKey } from "@/lib/measurement-reminders/due-day";
+import {
+  isOverdueDue,
+  relativeDueKey,
+} from "@/lib/measurement-reminders/due-day";
 import { cn } from "@/lib/utils";
 import { applyOrder, useModuleListPrefs } from "@/lib/module-list-prefs";
 import { EncounterSheet } from "@/components/encounters/encounter-sheet";
@@ -899,8 +902,7 @@ function VorsorgeCard({
   // routes to the check-in page), never the numeric value-entry wording.
   const isScreening = isScreeningReminderType(reminder.measurementType);
   const isDue =
-    due.key === "measurementReminders.nextDue.today" ||
-    due.key === "measurementReminders.overdueByDays";
+    due.key === "measurementReminders.nextDue.today" || isOverdueDue(due);
   const progress = intervalProgress(reminder, now);
 
   // Category-style header badge: the measurement label, or "self-planned"
@@ -1361,7 +1363,7 @@ function VorsorgeCard({
   // normal muted-resolved date. The card surface stays neutral per the house
   // rule; only this inline label carries the status hue.
   const dueIsToday = due.key === "measurementReminders.nextDue.today";
-  const dueIsOverdue = due.key === "measurementReminders.overdueByDays";
+  const dueIsOverdue = isOverdueDue(due);
   const nextLastSlot = (
     <div className="min-h-[2.75rem] space-y-1.5 text-sm">
       <div className="text-muted-foreground flex items-baseline justify-between gap-3">

src/lib/measurement-reminders/__tests__/due-day.test.ts

@@ -16,7 +16,7 @@
  */
 import { describe, it, expect } from "vitest";
 
-import { relativeDueKey } from "../due-day";
+import { isOverdueDue, relativeDueKey } from "../due-day";
 
 /**
  * The profile zone under test. July is deliberate: no IANA zone shifts its
@@ -84,11 +84,33 @@ describe("relativeDueKey", () => {
     ).toEqual(TOMORROW);
   });
 
-  it("counts a checkup from yesterday as one day overdue, however recent", () => {
-    // Forty-five minutes in the past. It was still yesterday's checkup.
+  it("calls a checkup from yesterday overdue since yesterday, however recent", () => {
+    // Forty-five minutes in the past. It was still yesterday's checkup. Its
+    // own phrase, because "overdue by 1 days" is what the counted form reads
+    // as on the one day an open check-up is most likely to be looked at.
     expect(
       relativeDueKey(zoned(FRIDAY, 23, 30), at(SATURDAY, 0, 15), ZONE),
-    ).toEqual({ key: "measurementReminders.overdueByDays", days: 1 });
+    ).toEqual({ key: "measurementReminders.overdueSinceYesterday", days: 1 });
+  });
+
+  it("counts the days for a checkup overdue longer than that", () => {
+    expect(relativeDueKey(zoned(FRIDAY, 9), at(FRIDAY + 2, 10), ZONE)).toEqual({
+      key: "measurementReminders.overdueByDays",
+      days: 2,
+    });
+  });
+
+  it("reads both overdue phrases as overdue, and nothing else", () => {
+    const now = at(SATURDAY, 12);
+    expect(isOverdueDue(relativeDueKey(zoned(FRIDAY, 9), now, ZONE))).toBe(
+      true,
+    );
+    expect(isOverdueDue(relativeDueKey(zoned(FRIDAY - 3, 9), now, ZONE))).toBe(
+      true,
+    );
+    expect(isOverdueDue(relativeDueKey(zoned(SATURDAY, 9), now, ZONE))).toBe(
+      false,
+    );
   });
 
   it("counts whole calendar days for a checkup further out", () => {

src/lib/measurement-reminders/due-day.ts

@@ -86,6 +86,11 @@ export function relativeDueKey(
   if (Number.isNaN(due.getTime()))
     return { key: "measurementReminders.nextDue.none", days: 0 };
   const deltaDays = calendarDaysUntil(due, new Date(now), timeZone);
+  // Its own phrase rather than the counted one: "overdue by 1 days" is what
+  // the counted form reads as, on the one day an open check-up (which since
+  // v1.39.2 stays due after its reminder) is most likely to be looked at.
+  if (deltaDays === -1)
+    return { key: "measurementReminders.overdueSinceYesterday", days: 1 };
   if (deltaDays < 0)
     return {
       key: "measurementReminders.overdueByDays",
@@ -97,3 +102,15 @@ export function relativeDueKey(
     return { key: "measurementReminders.nextDue.tomorrow", days: 1 };
   return { key: "measurementReminders.nextDue.inDays", days: deltaDays };
 }
+
+/**
+ * Whether a phrase from {@link relativeDueKey} says "overdue". Two keys do —
+ * "since yesterday" and the counted one — so a surface that colours an
+ * overdue badge asks here rather than comparing against one of them.
+ */
+export function isOverdueDue(due: RelativeDue): boolean {
+  return (
+    due.key === "measurementReminders.overdueByDays" ||
+    due.key === "measurementReminders.overdueSinceYesterday"
+  );
+}