Smart Contracts: handle tokens with decimals != 8

### Describe the problem you discovered

### Describe the solution you'd like

code is hardcoded as if there's 8 decimals.
I believe it's done to not do some I/O, so we probably need to embed the decimal in the TokenTransfer struct

### Epic

_No response_

Start by locating the TokenTransfer struct and the code that hardcodes 8 decimal places for token transfers. Trace how token decimal metadata is obtained and used; done means transfers handle tokens with decimals other than 8 without relying on a fixed value.

Written by the indexing model from the issue text.