View Bindings Panel Undo Crash — Function Parameter Pin Not Properly Serialized

Initial investigation: After looking at the code, it seems the issue is that when the Function is set, its parameter isn't serialized as a valid Pin into the transaction. As a result, on Undo the transaction system fails to properly record/remove this parameter Pin, so after Redo the UI state and the underlying data become inconsistent — leaving a stale variable entry that should have been cleaned up, which crashes when clicked.

1. In the View Bindings panel, Add a ViewModel and bind to a Function with an input param on that ViewModel
2. Ctrl+Z to undo that action
3. The input param entry from that ViewModel remains in the panel — clicking it crashes the editor
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