deleting hole 1 nukes hole 2

[max-mrgrsk]

discussion in slack:
https://kittycadworkspace.slack.com/archives/C04KFV6NKL0/p1765475650340279

Reproduce:

• create box,
• add hole001,
• add hole002.
• delete hole001 → hole002 breaks.

Analysis:

• Each operation references the previous; deleting a parent nukes dependents.

Idea:

• On delete, auto-relink dependents to the deleted op’s input (rebind features from hole001 → its input).
• Always reference the original body with each hole like fillets and chamfers