fix: harden dashboard takenBy rendering

frontend/src/pages/DashboardPage.tsx

@@ -62,6 +62,11 @@ function findFocusTargetElement(doseId: string | null, medId: string | null): HT
 	return null;
 }
 
+function getDosePeople(takenBy: unknown): Array<string | null> {
+	const takenByArray = Array.isArray(takenBy) ? takenBy : [];
+	return takenByArray.length > 0 ? takenByArray : [null];
+}
+
 export function DashboardPage() {
 	const { t, i18n } = useTranslation();
 	const { user } = useAuth();
@@ -1035,7 +1040,7 @@ export function DashboardPage() {
 																<div className="doses-col">
 																	{item.doses.map((dose) => {
 																		// If no takenBy, show single checkbox; otherwise show one per person
-																		const people = dose.takenBy.length > 0 ? dose.takenBy : [null];
+																		const people = getDosePeople(dose.takenBy);
 																		const allTaken = people.every((person) =>
 																			isDoseTakenForDisplay(getDoseId(dose.id, person))
 																		);
@@ -1358,7 +1363,7 @@ export function DashboardPage() {
 																<div className="doses-col">
 																	{item.doses.map((dose) => {
 																		const isOverdue = dose.when < Date.now() && !isEmpty;
-																		const people = dose.takenBy.length > 0 ? dose.takenBy : [null];
+																		const people = getDosePeople(dose.takenBy);
 																		const allTaken = people.every((person) =>
 																			isDoseTakenForDisplay(getDoseId(dose.id, person))
 																		);
@@ -1443,7 +1448,7 @@ export function DashboardPage() {
 										const totalFutureDoses = futureDays.flatMap((d) =>
 											d.meds.flatMap((m) =>
 												m.doses.flatMap((dose) =>
-													dose.takenBy.length > 0 ? dose.takenBy.map((p) => `${dose.id}-${p}`) : [dose.id]
+													getDosePeople(dose.takenBy).map((person) => (person ? `${dose.id}-${person}` : dose.id))
 												)
 											)
 										);
@@ -1623,7 +1628,7 @@ export function DashboardPage() {
 																</div>
 																<div className="doses-col">
 																	{item.doses.map((dose) => {
-																		const people = dose.takenBy.length > 0 ? dose.takenBy : [null];
+																		const people = getDosePeople(dose.takenBy);
 																		const allTaken = people.every((person) =>
 																			isDoseTakenForDisplay(getDoseId(dose.id, person))
 																		);

frontend/src/test/pages/DashboardPage.test.tsx

@@ -165,6 +165,7 @@ const createMockAppContext = (overrides = {}) => ({
 	todayDay: null,
 	futureDays: [],
 	takenDoses: new Set(),
+	skippedDoses: new Set(),
 	dismissedDoses: new Set(),
 	markDoseTaken: vi.fn(),
 	undoDoseTaken: vi.fn(),
@@ -385,6 +386,41 @@ describe("DashboardPage", () => {
 		expect(cards.length).toBeGreaterThan(0);
 	});
 
+	it("renders today doses even when schedule data omits takenBy arrays", () => {
+		mockContextValue = createMockAppContext({
+			todayDay: {
+				dateStr: "Today",
+				date: new Date(),
+				isPast: false,
+				meds: [
+					{
+						medName: "Aspirin",
+						total: 1,
+						doses: [
+							{
+								id: "dose-without-taken-by",
+								timeStr: "09:00",
+								when: Date.now() + 60_000,
+								usage: 1,
+								takenBy: undefined as unknown as string[],
+							},
+						],
+						lastWhen: Date.now() + 60_000,
+					},
+				],
+			},
+		});
+
+		render(
+			<MemoryRouter>
+				<DashboardPage />
+			</MemoryRouter>
+		);
+
+		expect(screen.getByText(/dashboard\.schedules\.title/i)).toBeInTheDocument();
+		expect(screen.getByText("09:00")).toBeInTheDocument();
+	});
+
 	it("renders schedule days selector", () => {
 		render(
 			<MemoryRouter>