[Bug]: Error message contains "undefined" in CJIT flow

[catch-21]

Describe the bug

When unable to get CJIT channel order fee, Bitkit displays an error containing "undefined". It could simply omit the text when value is undefined.

Reproduce

1. With no existing LN connection
2. Enable aeroplane mode to stop network
3. Attempt to receive lightning funds
4. Observe error message reads "Failed to estimate channel order fee. undefined"

Screenshots / Recording

https://github.com/user-attachments/assets/0bfe935a-733d-426d-a22b-e9d97653ecbe

Operating system

iPhone8 (iOS16)

Bitkit version

1.0.6 (138)

Log output

No response