fix(notifications): New Activity vs Daily Reminder separation and copy

- PushNotificationPermission: show "Turn on New Activity Notifications"
  when enabling New Activity; use NOTIFY_PUSH_SUCCESS_NEW_ACTIVITY for
  success toast so copy says "New Activity notifications are now enabled."
- App.vue: on native, turnOffNotifications invokes the modal's callback
  only (fixes turn-off not updating state); add comment that callback is
  per notification type.
- AccountViewView: handle plugin UNIMPLEMENTED for scheduleDualNotification
  on iOS with friendlier message; add New Activity time block and "Edit
  New Activity Notification…"; rename Daily Reminder button to "Edit Daily
  Reminder…".
- Constants: add NOTIFY_PUSH_SUCCESS_NEW_ACTIVITY. Reminder IDs and
  Option A (skip single reminder for New Activity) from earlier commit.

src/constants/notifications.ts

@@ -1640,12 +1640,18 @@ export const NOTIFY_PUSH_SETUP_UNDERWAY = {
     "Setting up notifications for interesting activity, which takes about 10 seconds. If you don't see a final confirmation, check the 'Troubleshoot' page.",
 };
 
-// Used in: PushNotificationPermission.vue (turnOnNotifications method - success)
+// Used in: PushNotificationPermission.vue (turnOnNotifications method - success, Daily Reminder)
 export const NOTIFY_PUSH_SUCCESS = {
   title: "Notifications On",
   message: "Daily Reminder notifications are now enabled.",
 };
 
+// Used in: PushNotificationPermission.vue (turnOnNotifications method - success, New Activity only)
+export const NOTIFY_PUSH_SUCCESS_NEW_ACTIVITY = {
+  title: "Notifications On",
+  message: "New Activity notifications are now enabled.",
+};
+
 // Used in: PushNotificationPermission.vue (turnOnNotifications method - general error)
 export const NOTIFY_PUSH_SETUP_ERROR = {
   title: "Error Setting Notification Permissions",