implemented deletion of locations

frontend/src/routes/stock/Index.svelte

@@ -22,6 +22,32 @@
     let properties = $state(null);
     let top_level = $state(null);
 
+    async function deleteLocation(loc){
+        if (!confirm(t('confirm_delete',{element:loc.name}))) return;
+        const url = api(`stock/location/${loc.id}`);
+        const res = await fetch(url,{
+            credentials: 'include',
+            method: 'DELETE',
+        });
+        if (res.ok){
+            yikes();
+            for (var owner of top_level){
+                if (owner.locations && dropNestedLocation(owner.locations,loc)) break;
+            }
+        } else error(res);
+    }
+
+    function dropNestedLocation(locations,loc){
+        for (let [idx,entry] of locations.entries()){
+            if (entry.id == loc.id){
+                locations.splice(idx,1);
+                return true;
+            }
+            if (entry.locations && dropNestedLocation(entry.locations,loc)) return true;
+        }
+        return false;
+    }
+
     async function move_dragged_to(new_loc){
         const data = { item : draggedItem.id, target: new_loc.id };
         const url = api('stock/move_item');