fix(templates): fix ErrorToast rendering literal { message } instead of error text

ErrorToast used Go string literal '{ message }' instead of templ
interpolation, so the actual error message was never shown — just the
literal text "{ message }" appeared in the toast.

templates/toast.templ

@@ -2,6 +2,6 @@ package templates
 
 templ ErrorToast(message string) {
 	if message != "" {
-		<div x-data="toastError" x-init="showErrorToast('{ message }')"></div>
+		<div x-data="toastError" x-init={ "showErrorToast('" + message + "')" }></div>
 	}
 }