[Bug]: RBF'd activity has incorrect fee rate

[pwltr]

What happened?

When a transaction is replaced in the mempool after RBF, the new activity item has the correct total fee but incorrect fee rate, resulting in Bitkit showing incorrect duration to confirmation.

Logs / Screenshots / Recordings

Simulator.Screen.Recording.-.iPhone.17.-.2026-03-11.at.13.06.19.mov

Bitkit Version

182