[BUG] Manual connections not tracked in undo/redo, redo deletes node

[matKlju]

Bug description:
When adding a copied node and manually connecting it, performing redo deletes the last node. The manual connection action is not tracked correctly in the undo/redo history.

Expected behavior:
Manual connections should be included in the undo/redo stack. Redo must not delete nodes and should accurately restore the last undone action.

Video:

node_endge_undo.zip

Additional information:
Repro steps:

1. Copy an existing node
2. Paste the node
3. Manually connect the pasted node
4. Undo
5. Redo

Result:

• Redo deletes the last node
• Manual connection is not represented in undo/redo history