feat: recent activity card on Home and Retention card on Settings

internal/domain/audit/auditSettings.go

@@ -26,6 +26,7 @@ type Settings struct {
 	RetentionDays      int        `json:"activity_retention_days"`
 	LastCleanupAt      *time.Time `json:"activity_last_cleanup_at"`
 	LastCleanupRemoved int        `json:"activity_last_cleanup_removed"`
+	NextCleanupAt      *time.Time `json:"activity_next_cleanup_at"`
 }
 
 func DefaultSettings() Settings {
@@ -40,6 +41,19 @@ func (s Settings) CleanupDue(now time.Time) bool {
 	return s.LastCleanupAt == nil || s.LastCleanupAt.Before(todayRun)
 }
 
+func (s Settings) WithNextCleanup(now time.Time) Settings {
+	s.NextCleanupAt = nil
+	if s.RetentionDays == ForeverRetentionDays {
+		return s
+	}
+	next := time.Date(now.Year(), now.Month(), now.Day(), CleanupHour, 0, 0, 0, now.Location())
+	if !next.After(now) {
+		next = time.Date(now.Year(), now.Month(), now.Day()+1, CleanupHour, 0, 0, 0, now.Location())
+	}
+	s.NextCleanupAt = &next
+	return s
+}
+
 func ClampCutoff(now time.Time, cutoff time.Time) time.Time {
 	newest := now.Add(-KeepRecentHours * time.Hour)
 	if cutoff.After(newest) {