refactor: planet owner

internal/controller/ship_group_upgrade.go

@@ -4,7 +4,6 @@ import (
 	"math"
 	"slices"
 
-	"github.com/google/uuid"
 	e "github.com/iliadenisov/galaxy/internal/error"
 	"github.com/iliadenisov/galaxy/internal/model/game"
 )
@@ -31,7 +30,7 @@ func (c *Cache) UpgradeGroup(ri int, groupIndex uint, techInput string, limitShi
 	}
 
 	p := c.MustPlanet(sg.Destination)
-	if p.Owner != uuid.Nil && p.Owner != c.g.Race[ri].ID {
+	if p.Owned() && !p.OwnedBy(c.g.Race[ri].ID) {
 		return e.NewEntityNotOwnedError("planet #%d for upgrade group #%d", p.Number, groupIndex)
 	}