[feature Request] High fee warning

[Schnuartz]

I think it would be cool if the Hardware Wallet would warn you. If you are about to make a transaction with a disproportionate high transaction fee.

Maybe something like:
more than 20% of the amount with transactions above 100 000 sats
more than 30% of the amount with transactions under 100 000 sats

And maybe a relative amount if sats/vbyte is very high.

Maybe like 100 sats per vbyte -> warning high fee

300 sats per vbyte -> warning very high fee

I think this could protect users from accidently signing a transaction with to high transaction fees.

P.S.
Maybe it would be cool to have the sats/vbyte rate displayed at the hardware Wallet as well. Maybe in the advanced settings. (if this could be easily implemented)

[al-munazzim]

Triage: feature request

Verdict: feature

Rationale: Valid UX improvement - users should be warned about high fees before signing, especially on a hardware wallet.

v1.10.0 relevant: No - nice to have, not blocking