fix: parse configured dispatch delay strings

internal/store/tasks.go

@@ -8,6 +8,8 @@ import (
 	"errors"
 	"fmt"
 	"math/big"
+	"strconv"
+	"strings"
 	"time"
 
 	"github.com/jmoiron/sqlx"
@@ -457,6 +459,9 @@ func jsonInt(value any) (int, bool) {
 	case json.Number:
 		parsed, err := typed.Int64()
 		return int(parsed), err == nil
+	case string:
+		parsed, err := strconv.Atoi(strings.TrimSpace(typed))
+		return parsed, err == nil
 	default:
 		return 0, false
 	}