implemented editing of item base data

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

frontend/src/routes/stock/ItemProps.svelte

@@ -42,25 +42,30 @@
         } else error(res);
     }
 
-    async function updateTitle(newVal){
+    async function patch(key,newVal){
         const url = api('stock');
         const data = {
             id    : item.id,
             owner : item.owner,
-            title : newVal
-        }
+        };
+        data[key] = newVal;
         const res = await fetch(url,{
             credentials:'include',
             method:'PATCH',
             body:JSON.stringify(data)
         });
+        if (res.ok){
+            yikes();
+            return true;
+        }
+        error(res);
         return false;
     }
 </script>
 
 {#if item}
-<LineEditor type="h3" editable={true} value={item.name} onSet={updateTitle}/>
-
+<LineEditor type="h3" editable={true} value={item.name} onSet={v => patch('name',v)} />
+Code: <LineEditor type="span" editable={true} value={item.code} onSet={v => patch('code',v)} />
 <table>
     <tbody>
         {#each item.properties.toSorted(byName) as prop}