feat(engagement): localize limits and streaks

Use reported user timezones for daily response limits, expose couple streak state and reminders, and improve swipe and live-drawing synchronization with focused tests and documentation.

apps/mobile/src/features/profile/components/NotificationSettings.tsx

@@ -37,6 +37,7 @@ export const NotificationSettings: React.FC<NotificationSettingsProps> = ({
         onPackChangesToggle: (value: boolean) => updatePreference('pack_changes_enabled', value),
         onNewPacksToggle: (value: boolean) => updatePreference('new_packs_enabled', value),
         onStreakMilestonesToggle: (value: boolean) => updatePreference('streak_milestones_enabled', value),
+        onStreakRemindersToggle: (value: boolean) => updatePreference('streak_reminders_enabled', value),
         onWeeklySummaryToggle: (value: boolean) => updatePreference('weekly_summary_enabled', value),
         onUnpairedRemindersToggle: (value: boolean) => updatePreference('unpaired_reminders_enabled', value),
         onCatchupRemindersToggle: (value: boolean) => updatePreference('catchup_reminders_enabled', value),
@@ -138,6 +139,21 @@ export const NotificationSettings: React.FC<NotificationSettingsProps> = ({
 
                     <View style={styles.itemDivider} />
 
+                    {partner && (
+                        <>
+                            <SwitchItem
+                                icon="alarm-outline"
+                                label="Streak Reminders"
+                                description="An evening nudge while your streak is still open"
+                                value={preferences.streak_reminders_enabled}
+                                onValueChange={handlers.onStreakRemindersToggle}
+                                disabled={isUpdating}
+                            />
+
+                            <View style={styles.itemDivider} />
+                        </>
+                    )}
+
                     <SwitchItem
                         icon="calendar-outline"
                         label="Weekly Recap"