fix: allow closing current week when future workdays are not yet closed

CloseWeek was requiring every workday in the ISO week to have a
closed_days record, including days in the future. Now only workdays
up to and including today are checked; future workdays are skipped.

Adds TestCloseWeekMidWeek regression test.

internal/service/week_service.go

@@ -88,13 +88,18 @@ func (s *WeekService) CloseWeek(ctx context.Context, weekKey string) (*domain.Cl
 	// Compute expected ms for the week (from settings frozen at week start)
 	expectedMs := int64(set.HoursPerWeek * 3_600_000)
 
-	// Verify all workdays are closed; collect worked ms
+	// Verify all workdays up to and including today are closed; collect worked ms.
+	// Future workdays in the week (not yet reached) are skipped.
+	todayKey := time.Now().In(s.tz).Format("2006-01-02")
 	var totalWorkedMs int64
 	for _, dk := range dayKeys {
 		t, _ := time.ParseInLocation("2006-01-02", dk, s.tz)
 		if !set.IsWorkday(int(t.Weekday())) {
 			continue // weekend or non-workday — skip
 		}
+		if dk > todayKey {
+			continue // future workday — skip
+		}
 		cd, err := s.closedDays.GetByDayKey(ctx, dk)
 		if err != nil {
 			if errors.Is(err, sql.ErrNoRows) {