añadido soporte para sacar la y y volverla a añadir

src/components/EditarModal.jsx

@@ -1,4 +1,8 @@
+import { useState } from "react";
 export default function EditarModal({ tipo, coord, show, close, setCoords }) {
+  if (coord == null) return null;
+  const [hasY, setHasY] = useState(coord.y !== null);
+
   const handleSubmit = (e) => {
     e.preventDefault();
 
@@ -50,6 +54,18 @@ export default function EditarModal({ tipo, coord, show, close, setCoords }) {
           </div>
           <div className="modal-body">
             <form onSubmit={handleSubmit}>
+              <div className="mb-3">
+                <input
+                  type="checkbox"
+                  className="form-check-input me-2"
+                  checked={hasY}
+                  onChange={(e) => {
+                    coord.y = e.target.checked ? "0" : null;
+                    setHasY(e.target.checked);
+                  }}
+                />
+                <label className="form-label">Lleva coordenada Y?</label>
+              </div>
               <div className="mb-3">
                 <label className="form-label">Coordenada X</label>
                 <input
@@ -59,7 +75,7 @@ export default function EditarModal({ tipo, coord, show, close, setCoords }) {
                   defaultValue={coord.x}
                 />
               </div>
-              {coord.y != null && (
+              {hasY && (
                 <div className="mb-3">
                   <label className="form-label">Coordenada Y</label>
                   <input