feat: close modals with browser back button on mobile (#257)

* feat: close modals with browser back button on mobile

Create reusable useModalHistory hook that pushes history state when a
modal opens and listens for popstate to close it. Apply to ReportModal,
ClearMissedConfirm, ExportModal, ImportConfirm, and all modals using
ConfirmModal/ShareDialog/Auth/ExportModal base components. Escape key
handling was already in place for desktop.

Closes #253

* fix: update tests for renamed button labels and missing useModalHistory mock

frontend/src/components/Auth.tsx

@@ -756,7 +756,7 @@ export function UserProfile({ onClose }: { onClose?: () => void }) {
 
 				<div className="profile-actions">
 					<button type="button" className="btn btn-ghost" onClick={onClose}>
-						{t("common.cancel", "Cancel")}
+						{t("common.close", "Close")}
 					</button>
 					<button type="submit" className="btn btn-primary" disabled={loading || !hasChanges}>
 						{loading ? t("common.saving", "Saving...") : t("auth.updatePassword", "Update Password")}

frontend/src/components/ConfirmModal.tsx

@@ -47,7 +47,7 @@ export function ConfirmModal({
 			}}
 		>
 			<div
-				className="modal-content"
+				className="modal-content confirm-modal"
 				onClick={(e) => e.stopPropagation()}
 				onKeyDown={(e) => e.stopPropagation()}
 				style={{ maxWidth: "450px" }}

frontend/src/components/ExportModal.tsx

@@ -64,7 +64,7 @@ export default function ExportModal({ isOpen, onClose, onExport, exporting }: Ex
 				</div>
 				<div className="modal-footer" style={{ padding: "1rem 0 0 0", borderTop: "none", justifyContent: "flex-end" }}>
 					<button type="button" className="ghost" onClick={onClose}>
-						{t("exportImport.cancelButton")}
+						{t("common.close")}
 					</button>
 				</div>
 			</div>

frontend/src/components/ReportModal.tsx

@@ -256,7 +256,7 @@ export function ReportModal({ isOpen, onClose, medications }: ReportModalProps)
 				{/* Actions */}
 				<div className="report-actions">
 					<button type="button" className="ghost" onClick={onClose}>
-						{t("common.cancel")}
+						{t("common.close")}
 					</button>
 					<button
 						type="button"

frontend/src/components/ShareDialog.tsx

@@ -145,7 +145,7 @@ export function ShareDialog({
 
 							<div className="share-dialog-footer">
 								<button className="ghost" onClick={onClose}>
-									{t("common.cancel")}
+									{t("common.close")}
 								</button>
 								<button onClick={onGenerateShareLink} disabled={shareGenerating || !shareSelectedPerson}>
 									{shareGenerating ? t("share.generating") : t("share.generateLink")}

frontend/src/hooks/index.ts

@@ -8,6 +8,7 @@ export type { UseMedicationFormReturn } from "./useMedicationForm";
 export { defaultBlister, defaultForm, useMedicationForm } from "./useMedicationForm";
 export type { UseMedicationsReturn } from "./useMedications";
 export { useMedications } from "./useMedications";
+export { useModalHistory } from "./useModalHistory";
 export type { UseRefillReturn } from "./useRefill";
 export { useRefill } from "./useRefill";
 export type { Settings, UseSettingsReturn } from "./useSettings";

frontend/src/hooks/useModalHistory.ts

@@ -0,0 +1,32 @@
+import { useEffect, useRef } from "react";
+
+/**
+ * Push a history entry when a modal opens so the browser back button closes it.
+ * On popstate (back), calls `onClose` to dismiss the modal.
+ */
+export function useModalHistory(isOpen: boolean, modalKey: string, onClose: () => void) {
+	const pushedRef = useRef(false);
+
+	useEffect(() => {
+		if (isOpen) {
+			window.history.pushState({ modal: modalKey }, "");
+			pushedRef.current = true;
+		} else if (pushedRef.current) {
+			pushedRef.current = false;
+		}
+	}, [isOpen, modalKey]);
+
+	useEffect(() => {
+		if (!isOpen) return;
+
+		const handlePopState = () => {
+			if (pushedRef.current) {
+				pushedRef.current = false;
+				onClose();
+			}
+		};
+
+		window.addEventListener("popstate", handlePopState);
+		return () => window.removeEventListener("popstate", handlePopState);
+	}, [isOpen, onClose]);
+}

frontend/src/pages/DashboardPage.tsx

@@ -4,6 +4,7 @@ import { useTranslation } from "react-i18next";
 import { ConfirmModal, MedicationAvatar } from "../components";
 import { useAuth } from "../components/Auth";
 import { useAppContext } from "../context";
+import { useModalHistory } from "../hooks";
 import { formatNumber, getExpiryClass, getSystemLocale } from "../utils/formatters";
 import { expandDoseIds, getStockStatus, isDoseDismissed } from "../utils/schedule";
 import {
@@ -75,6 +76,8 @@ export function DashboardPage() {
 		loadSettings,
 	} = useAppContext();
 
+	useModalHistory(showClearMissedConfirm, "clearMissed", () => setShowClearMissedConfirm(false));
+
 	// Get structured reminder data
 	const reminderData = getReminderStatusData(
 		settings.reminderDaysBefore,

frontend/src/pages/MedicationsPage.tsx

@@ -5,7 +5,7 @@ import { useSearchParams } from "react-router-dom";
 import { ConfirmModal, DateInput, Lightbox, MedicationAvatar, MobileEditModal, ReportModal } from "../components";
 import { useAuth } from "../components/Auth";
 import { useAppContext, useUnsavedChanges } from "../context";
-import { useMedicationForm, useUnsavedChangesWarning } from "../hooks";
+import { useMedicationForm, useModalHistory, useUnsavedChangesWarning } from "../hooks";
 import type { DoseUnit, Medication } from "../types";
 import { DOSE_UNITS, FIELD_LIMITS, getMedTotal, getPackageSize } from "../types";
 import { combineDateAndTime, formatDate, formatDateTime, formatNumber } from "../utils/formatters";
@@ -125,6 +125,7 @@ export function MedicationsPage() {
 	const [showObsolete, setShowObsolete] = useState(true);
 	const [readOnlyView, setReadOnlyView] = useState(false);
 	const [showReportModal, setShowReportModal] = useState(false);
+	useModalHistory(showReportModal, "report", () => setShowReportModal(false));
 	const [showNameValidation, setShowNameValidation] = useState(false);
 
 	useEffect(() => {
@@ -463,6 +464,20 @@ export function MedicationsPage() {
 
 			// Reset form after successful save
 			if (!editingId) {
+				const shouldCloseMobileModal = showEditModal && window.innerWidth <= 768;
+				if (shouldCloseMobileModal) {
+					// Treat post-save close as confirmed so popstate does not trigger unsaved guards.
+					closeConfirmedRef.current = true;
+					clearEditMedIdParam();
+					setShowEditModal(false);
+					setReadOnlyView(false);
+					setActiveTab("general");
+					setViewMode("grid");
+					resetForm();
+					window.history.back();
+					setSaving(false);
+					return;
+				}
 				resetForm();
 				setViewMode("grid");
 			} else {
@@ -480,6 +495,8 @@ export function MedicationsPage() {
 	// Handle browser back button for modals and unsaved changes
 	useEffect(() => {
 		const handlePopState = () => {
+			const currentEditMedId = new URLSearchParams(window.location.search).get("editMedId");
+
 			// Obsolete confirmation is open — dismiss it and stay where we are
 			if (showObsoleteConfirm) {
 				setShowObsoleteConfirm(false);
@@ -497,6 +514,11 @@ export function MedicationsPage() {
 			// If close was already confirmed programmatically, allow navigation
 			if (closeConfirmedRef.current) {
 				closeConfirmedRef.current = false;
+				if (currentEditMedId) {
+					// Prevent URL popstate from immediately reopening mobile edit for the same id.
+					processedEditMedIdRef.current = currentEditMedId;
+					clearEditMedIdParam();
+				}
 				if (showEditModal) {
 					setShowEditModal(false);
 					resetForm();
@@ -515,6 +537,10 @@ export function MedicationsPage() {
 					setShowUnsavedConfirm(true);
 					return;
 				}
+				if (currentEditMedId) {
+					// Mark as handled before URL cleanup to avoid same-tick re-open races.
+					processedEditMedIdRef.current = currentEditMedId;
+				}
 				clearEditMedIdParam();
 				setShowEditModal(false);
 				resetForm();

frontend/src/styles/modals-base.css

@@ -41,6 +41,19 @@
 	padding: 1.5rem;
 }
 
+.modal-content.confirm-modal {
+	margin: 0 auto;
+	width: min(100%, 450px);
+}
+
+@media (max-width: 500px) {
+	.modal-content.confirm-modal {
+		margin: 0 auto;
+		border-radius: 12px;
+		max-height: min(85dvh, 85vh);
+	}
+}
+
 @keyframes slideUp {
 	from {
 		opacity: 0;

frontend/src/test/components/Auth.test.tsx

@@ -556,7 +556,7 @@ describe("UserProfile", () => {
 		);
 
 		await waitFor(() => {
-			const cancelBtn = screen.getByText(/common\.cancel/i);
+			const cancelBtn = screen.getByText(/common\.close/i);
 			fireEvent.click(cancelBtn);
 		});
 

frontend/src/test/components/ExportModal.test.tsx

@@ -70,12 +70,12 @@ describe("ExportModal", () => {
 
 	it("renders cancel button", () => {
 		render(<ExportModal {...defaultProps} />);
-		expect(screen.getByText(/exportImport\.cancelButton/i)).toBeInTheDocument();
+		expect(screen.getByText(/common\.close/i)).toBeInTheDocument();
 	});
 
 	it("calls onClose when cancel button is clicked", () => {
 		render(<ExportModal {...defaultProps} />);
-		fireEvent.click(screen.getByText(/exportImport\.cancelButton/i));
+		fireEvent.click(screen.getByText(/common\.close/i));
 		expect(defaultProps.onClose).toHaveBeenCalled();
 	});
 

frontend/src/test/components/ReportModal.test.tsx

@@ -30,7 +30,7 @@ describe("ReportModal", () => {
 		render(<ReportModal isOpen={true} onClose={onClose} medications={[createMedication()]} />);
 
 		expect(screen.getByText(/report\.title/i)).toBeInTheDocument();
-		fireEvent.click(screen.getByRole("button", { name: /common\.cancel/i }));
+		fireEvent.click(screen.getByRole("button", { name: /common\.close/i }));
 		expect(onClose).toHaveBeenCalledTimes(1);
 	});
 

frontend/src/test/components/ShareDialog.test.tsx

@@ -54,7 +54,8 @@ describe("ShareDialog", () => {
 
 	it("calls onClose when close button is clicked", () => {
 		render(<ShareDialog {...defaultProps} />);
-		fireEvent.click(screen.getByRole("button", { name: /common\.close/i }));
+		const closeButtons = screen.getAllByRole("button", { name: /common\.close/i });
+		fireEvent.click(closeButtons[closeButtons.length - 1]);
 		expect(defaultProps.onClose).toHaveBeenCalled();
 	});
 

frontend/src/test/pages/MedicationsPage.test.tsx

@@ -124,6 +124,7 @@ const fetchMock = vi.fn();
 vi.mock("../../hooks", () => ({
 	useMedicationForm: () => mockFormHookValue,
 	useUnsavedChangesWarning: () => ({}),
+	useModalHistory: vi.fn(),
 }));
 
 vi.mock("../../context", () => ({