chore: added warnings

Warning 1: if elements have the same name, show a warning.
Warning 2: if a goal/triggerNode has no/empty plan, show a warning.
Warning 3: if (non-phase) elements start with or are a number,
    show a warning.

src/pages/VisProgPage/visualProgrammingUI/nodes/GoalNode.tsx

@@ -69,7 +69,7 @@ export default function GoalNode({id, data}: NodeProps<GoalNode>) {
     updateNodeData(id, {...data, can_fail: value});
   }
 
-
+  //undefined plan warning
   useEffect(() => {
     const noPlanWarning : EditorWarning = {
       scope: {
@@ -81,12 +81,31 @@ export default function GoalNode({id, data}: NodeProps<GoalNode>) {
       description: "This goalNode is missing a plan, please make sure to create a plan by using the create plan button"
     };
 
-    if (!data.plan){
+    if (!data.plan || data.plan.steps?.length === 0){
       registerWarning(noPlanWarning);
       return;
     }
     unregisterWarning(id, noPlanWarning.type);
   },[data.plan, id, registerWarning, unregisterWarning])
+
+  //starts with number warning
+  useEffect(() => {
+      const name = data.name || "";
+      
+      const startsWithNumberWarning: EditorWarning = {
+        scope: { id: id },
+        type: 'ELEMENT_STARTS_WITH_NUMBER',
+        severity: 'ERROR',
+        description: "Norms are not allowed to start with a number."
+      };
+  
+      if (/^\d/.test(name)) {
+        registerWarning(startsWithNumberWarning);
+      } else {
+        unregisterWarning(id, 'ELEMENT_STARTS_WITH_NUMBER');
+      }
+    }, [data.name, id, registerWarning, unregisterWarning]);
+  
   return <>
     <Toolbar nodeId={id} allowDelete={true}/>
     <div className={`${styles.defaultNode} ${styles.nodeGoal} flex-col gap-sm`}>