fix: revert moving link

frontend/src/components/visual-editor/v2/Diagrams.tsx

@@ -344,6 +344,61 @@ const Diagrams = () => {
     const id = deleteDialogCtl?.data;
 
     if (id) {
+      // Handle link deletion
+      if (id.length === 36) {
+        const link = model?.getLink(id) as any;
+        const sourceId = link?.sourcePort.parent.options.id;
+        const targetId = link?.targetPort.parent.options.id;
+
+        if (link?.sourcePort.options.label === BlockPorts.nextBlocksOutPort) {
+          const previousData = getBlockFromCache(sourceId);
+          const nextBlocks = [...(previousData?.nextBlocks || [])];
+
+          await updateBlock(
+            {
+              id: sourceId,
+              params: {
+                nextBlocks: nextBlocks.filter((block) => block !== targetId),
+              },
+            },
+            {
+              onSuccess() {
+                updateCachedBlock({
+                  id: targetId,
+                  preprocess: ({ previousBlocks = [], ...rest }) => ({
+                    ...rest,
+                    previousBlocks: previousBlocks.filter(
+                      (previousBlock) => previousBlock !== sourceId,
+                    ),
+                  }),
+                });
+              },
+            },
+          );
+        } else if (
+          link?.sourcePort.options.label === BlockPorts.attachmentOutPort
+        ) {
+          await updateBlock(
+            {
+              id: sourceId,
+              params: {
+                attachedBlock: null,
+              },
+            },
+            {
+              onSuccess() {
+                updateCachedBlock({
+                  id: targetId,
+                  preprocess: (oldData) => ({
+                    ...oldData,
+                    attachedToBlock: null,
+                  }),
+                });
+              },
+            },
+          );
+        }
+      } else {
         const ids = id.split(",");
 
         if (ids.length > 1) {
@@ -439,6 +494,7 @@ const Diagrams = () => {
             },
           });
         }
+      }
 
       deleteCallbackRef.current?.();
       deleteCallbackRef.current = () => {};