diff --git a/client/src/components/Notifications/InAppNotificationItem.tsx b/client/src/components/Notifications/InAppNotificationItem.tsx
index 3c4eed44e..4d68ecf25 100644
--- a/client/src/components/Notifications/InAppNotificationItem.tsx
+++ b/client/src/components/Notifications/InAppNotificationItem.tsx
@@ -1,19 +1,12 @@
-import React, { useState } from 'react'
-import { useNavigate } from 'react-router'
+import React from 'react'
 import { User, Check, X, ArrowRight, Trash2, CheckCheck } from 'lucide-react'
 import { useTranslation } from '../../i18n'
-import { useInAppNotificationStore, InAppNotification } from '../../store/inAppNotificationStore'
+import type { InAppNotification } from '../../store/inAppNotificationStore'
 import { useSettingsStore } from '../../store/settingsStore'
+import { compactTime, useNotificationItemActions } from './useNotificationItemActions'
 
 function relativeTime(dateStr: string, locale: string): string {
-  const diff = Date.now() - new Date(dateStr).getTime()
-  const minutes = Math.floor(diff / 60000)
-  if (minutes < 1) return locale === 'ar' ? 'الآن' : 'just now'
-  if (minutes < 60) return `${minutes}m`
-  const hours = Math.floor(minutes / 60)
-  if (hours < 24) return `${hours}h`
-  const days = Math.floor(hours / 24)
-  return `${days}d`
+  return compactTime(dateStr, locale === 'ar' ? 'الآن' : 'just now')
 }
 
 interface NotificationItemProps {
@@ -23,28 +16,11 @@ interface NotificationItemProps {
 
 export default function InAppNotificationItem({ notification, onClose }: NotificationItemProps): React.ReactElement {
   const { t, locale } = useTranslation()
-  const navigate = useNavigate()
   const { settings } = useSettingsStore()
   const darkMode = settings.dark_mode
   const dark = darkMode === true || darkMode === 'dark' || (darkMode === 'auto' && window.matchMedia('(prefers-color-scheme: dark)').matches)
-  const [responding, setResponding] = useState(false)
-
-  const { markRead, markUnread, deleteNotification, respondToBoolean } = useInAppNotificationStore()
-
-  const handleNavigate = async () => {
-    if (!notification.is_read) await markRead(notification.id)
-    if (notification.navigate_target) {
-      navigate(notification.navigate_target)
-      onClose?.()
-    }
-  }
-
-  const handleRespond = async (response: 'positive' | 'negative') => {
-    if (responding || notification.response !== null) return
-    setResponding(true)
-    await respondToBoolean(notification.id, response)
-    setResponding(false)
-  }
+  const { responding, handleRespond, handleNavigate, markRead, deleteNotification } =
+    useNotificationItemActions(notification, onClose)
 
   const titleText = t(notification.title_key, notification.title_params)
   const bodyText = t(notification.text_key, notification.text_params)
diff --git a/client/src/components/Notifications/useNotificationItemActions.test.ts b/client/src/components/Notifications/useNotificationItemActions.test.ts
new file mode 100644
index 000000000..21d406d02
--- /dev/null
+++ b/client/src/components/Notifications/useNotificationItemActions.test.ts
@@ -0,0 +1,121 @@
+// FE-COMP-NOTIFITEM-ACTIONS-001 onwards: what one notification can do, behind both lists.
+import { act, renderHook } from '@testing-library/react';
+
+import { resetAllStores, seedStore } from '../../../tests/helpers/store';
+import { type InAppNotification, useInAppNotificationStore } from '../../store/inAppNotificationStore';
+import { compactTime, useNotificationItemActions } from './useNotificationItemActions';
+
+const navigate = vi.hoisted(() => vi.fn());
+vi.mock('react-router', async () => {
+  const actual = await vi.importActual<typeof import('react-router')>('react-router');
+  return { ...actual, useNavigate: () => navigate };
+});
+
+const markRead = vi.fn();
+const deleteNotification = vi.fn();
+const respondToBoolean = vi.fn();
+
+function notification(over: Partial<InAppNotification> = {}): InAppNotification {
+  return {
+    id: 7,
+    type: 'navigate',
+    scope: 'user',
+    target: 1,
+    sender_id: null,
+    sender_username: null,
+    sender_avatar: null,
+    recipient_id: 1,
+    title_key: 't',
+    title_params: {},
+    text_key: 'x',
+    text_params: {},
+    positive_text_key: null,
+    negative_text_key: null,
+    response: null,
+    navigate_text_key: 'go',
+    navigate_target: '/trips/1',
+    is_read: false,
+    created_at: new Date().toISOString(),
+    ...over,
+  };
+}
+
+beforeEach(() => {
+  resetAllStores();
+  navigate.mockReset();
+  markRead.mockReset().mockResolvedValue(undefined);
+  deleteNotification.mockReset().mockResolvedValue(undefined);
+  respondToBoolean.mockReset().mockResolvedValue(undefined);
+  seedStore(useInAppNotificationStore, { markRead, deleteNotification, respondToBoolean });
+});
+
+describe('compactTime', () => {
+  it('FE-COMP-NOTIFITEM-ACTIONS-001: minutes, hours and days, and the caller wording under a minute', () => {
+    const ago = (ms: number) => new Date(Date.now() - ms).toISOString();
+    expect(compactTime(ago(10_000), 'now')).toBe('now');
+    expect(compactTime(ago(5 * 60_000), 'now')).toBe('5m');
+    expect(compactTime(ago(3 * 3_600_000), 'now')).toBe('3h');
+    expect(compactTime(ago(2 * 86_400_000), 'now')).toBe('2d');
+  });
+});
+
+describe('useNotificationItemActions', () => {
+  it('FE-COMP-NOTIFITEM-ACTIONS-002: navigating marks an unread item read first, then follows and closes', async () => {
+    const onClose = vi.fn();
+    const { result } = renderHook(() => useNotificationItemActions(notification(), onClose));
+    await act(() => result.current.handleNavigate());
+    expect(markRead).toHaveBeenCalledWith(7);
+    expect(navigate).toHaveBeenCalledWith('/trips/1');
+    expect(onClose).toHaveBeenCalledTimes(1);
+  });
+
+  it('FE-COMP-NOTIFITEM-ACTIONS-003: a read item is not marked again, and no target means no navigation', async () => {
+    const onClose = vi.fn();
+    const read = renderHook(() => useNotificationItemActions(notification({ is_read: true })));
+    await act(() => read.result.current.handleNavigate());
+    expect(markRead).not.toHaveBeenCalled();
+    expect(navigate).toHaveBeenCalledWith('/trips/1');
+
+    navigate.mockReset();
+    const none = renderHook(() => useNotificationItemActions(notification({ navigate_target: null }), onClose));
+    await act(() => none.result.current.handleNavigate());
+    expect(navigate).not.toHaveBeenCalled();
+    expect(onClose).not.toHaveBeenCalled();
+  });
+
+  it('FE-COMP-NOTIFITEM-ACTIONS-004: a question is answered once, and not at all after an answer', async () => {
+    let finish: () => void = () => {};
+    respondToBoolean.mockImplementation(
+      () =>
+        new Promise<void>((resolve) => {
+          finish = resolve;
+        })
+    );
+    const { result } = renderHook(() => useNotificationItemActions(notification({ type: 'boolean' })));
+    act(() => {
+      void result.current.handleRespond('positive');
+    });
+    expect(result.current.responding).toBe(true);
+    act(() => {
+      void result.current.handleRespond('negative');
+    });
+    expect(respondToBoolean).toHaveBeenCalledTimes(1);
+    expect(respondToBoolean).toHaveBeenCalledWith(7, 'positive');
+    await act(async () => finish());
+    expect(result.current.responding).toBe(false);
+
+    const answered = renderHook(() =>
+      useNotificationItemActions(notification({ type: 'boolean', response: 'negative' }))
+    );
+    await act(() => answered.result.current.handleRespond('positive'));
+    expect(respondToBoolean).toHaveBeenCalledTimes(1);
+  });
+
+  it('FE-COMP-NOTIFITEM-ACTIONS-005: hands the store mark read and delete through', () => {
+    const { result } = renderHook(() => useNotificationItemActions(notification()));
+    void result.current.markRead(7);
+    void result.current.deleteNotification(7);
+    expect(markRead).toHaveBeenCalledWith(7);
+    expect(deleteNotification).toHaveBeenCalledWith(7);
+  });
+});
diff --git a/client/src/components/Notifications/useNotificationItemActions.ts b/client/src/components/Notifications/useNotificationItemActions.ts
new file mode 100644
index 000000000..038e259f5
--- /dev/null
+++ b/client/src/components/Notifications/useNotificationItemActions.ts
@@ -0,0 +1,42 @@
+import { useState } from 'react';
+import { useNavigate } from 'react-router';
+
+import { type InAppNotification, useInAppNotificationStore } from '../../store/inAppNotificationStore';
+
+/** Compact relative timestamp ("5m" / "3h" / "2d"); under a minute it reads `justNow`. */
+export function compactTime(dateStr: string, justNow: string): string {
+  const minutes = Math.floor((Date.now() - new Date(dateStr).getTime()) / 60000);
+  if (minutes < 1) return justNow;
+  if (minutes < 60) return `${minutes}m`;
+  const hours = Math.floor(minutes / 60);
+  if (hours < 24) return `${hours}h`;
+  return `${Math.floor(hours / 24)}d`;
+}
+
+/**
+ * What one in-app notification can do, behind both lists (the desktop bell's item and
+ * the phone row render their own markup over this): answer a yes or no question once,
+ * follow its link (marking it read first), mark it read and delete it.
+ */
+export function useNotificationItemActions(notification: InAppNotification, onClose?: () => void) {
+  const navigate = useNavigate();
+  const [responding, setResponding] = useState(false);
+  const { markRead, deleteNotification, respondToBoolean } = useInAppNotificationStore();
+
+  const handleRespond = async (response: 'positive' | 'negative') => {
+    if (responding || notification.response !== null) return;
+    setResponding(true);
+    await respondToBoolean(notification.id, response);
+    setResponding(false);
+  };
+
+  const handleNavigate = async () => {
+    if (!notification.is_read) await markRead(notification.id);
+    if (notification.navigate_target) {
+      navigate(notification.navigate_target);
+      onClose?.();
+    }
+  };
+
+  return { responding, handleRespond, handleNavigate, markRead, deleteNotification };
+}
diff --git a/client/src/mobile/screens/notifications/MNotificationRow.tsx b/client/src/mobile/screens/notifications/MNotificationRow.tsx
index 41e4a13ec..32378e3c1 100644
--- a/client/src/mobile/screens/notifications/MNotificationRow.tsx
+++ b/client/src/mobile/screens/notifications/MNotificationRow.tsx
@@ -1,20 +1,10 @@
-import { useState, type HTMLAttributes } from 'react'
-import { useNavigate } from 'react-router'
+import type { HTMLAttributes } from 'react'
 import { ArrowRight, Bell, Check, Trash2, X } from 'lucide-react'
 import { useTranslation } from '../../../i18n'
-import { useInAppNotificationStore, InAppNotification } from '../../../store/inAppNotificationStore'
+import type { InAppNotification } from '../../../store/inAppNotificationStore'
+import { compactTime, useNotificationItemActions } from '../../../components/Notifications/useNotificationItemActions'
 import MChip from '../../components/MChip'
 
-/** Compact relative timestamp ("5m" / "3h" / "2d"), locale-neutral like the desktop item. */
-function compactTime(dateStr: string, justNow: string): string {
-  const minutes = Math.floor((Date.now() - new Date(dateStr).getTime()) / 60000)
-  if (minutes < 1) return justNow
-  if (minutes < 60) return `${minutes}m`
-  const hours = Math.floor(minutes / 60)
-  if (hours < 24) return `${hours}h`
-  return `${Math.floor(hours / 24)}d`
-}
-
 interface MNotificationRowProps {
   notification: InAppNotification
 }
@@ -26,25 +16,11 @@ interface MNotificationRowProps {
  */
 export default function MNotificationRow({ notification }: MNotificationRowProps) {
   const { t } = useTranslation()
-  const navigate = useNavigate()
-  const [responding, setResponding] = useState(false)
-  const { markRead, deleteNotification, respondToBoolean } = useInAppNotificationStore()
+  const { handleRespond, handleNavigate, markRead, deleteNotification } = useNotificationItemActions(notification)
 
   const title = t(notification.title_key, notification.title_params)
   const body = t(notification.text_key, notification.text_params)
 
-  const handleRespond = async (response: 'positive' | 'negative') => {
-    if (responding || notification.response !== null) return
-    setResponding(true)
-    await respondToBoolean(notification.id, response)
-    setResponding(false)
-  }
-
-  const handleNavigate = async () => {
-    if (!notification.is_read) await markRead(notification.id)
-    if (notification.navigate_target) navigate(notification.navigate_target)
-  }
-
   // Tapping an unread row marks it read; a row that is already read carries no
   // action, so it neither takes focus nor claims a role. It stays a div because
   // the chips and the delete button inside it are buttons of their own.