fix: Revert certificate description to use hyphens

The certificate description with spaces appears to be causing Config Connector
to fail provisioning certificates. Reverting to hyphenated format that was
working previously.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: pinetops

internal/deploy/preview.go

@@ -62,7 +62,7 @@ func NewPreviewCommand(appConfig *config.AppConfig) *cobra.Command {
 			deployConfig.ServiceName = fmt.Sprintf("preview-%s-service", appConfig.App)
 			deployConfig.CertName = fmt.Sprintf("%s-preview-cert-%s", appConfig.App, previewName)
 			deployConfig.CertEntryName = fmt.Sprintf("%s-preview-entry-%s", appConfig.App, previewName)
-			deployConfig.CertDescription = fmt.Sprintf("Certificate for %s", deployConfig.Domain)
+			deployConfig.CertDescription = fmt.Sprintf("Certificate-for-%s", deployConfig.Domain)
 			deployConfig.ImageTag = fmt.Sprintf("preview-%s", deployConfig.CommitSHA)
 
 			if releaseName != "" {