Allowance for debt asset

[brozorec]

Context

Currently, the allowance modal handles only the collateral asset that works when we deposit. It breaks when we want to pay back.

TODOs

• extend the functionalities of the allowance modal to deal with the debt asset, too, based on the mode:
• when DEPOSIT_AND_BORROW or DEPOSIT -> deal with allowance for the collateral asset
• when PAYBACK_AND_WITHDRAW or PAYBACK -> deal with allowance for the debt asset
• make changes to the borrow store to account for that (maybe add a param to allow() to differentiate between what allowance to deal with?)

[ferostabio]

@brozorec doing this I realized that even if I removed the infinite limit switch, the modal's text is all about it

<Typography mt="1rem">
  To avoid having to reapprove for subsequent transactions, you could enable infinite approval.
</Typography>

<Typography mt="1rem">
  Otherwise, only the exact amount for this transaction will be allowed to be transfered from your wallet.
</Typography>

[ferostabio]

@brozorec we also need to decide what to do with

set(
  produce((s: BorrowState) => {
    if (s.collateral.allowance.value) {
      // optimistic: we assume transaction will success and update allowance according to that
      s.collateral.allowance.value -= parseFloat(s.collateral.input)
    }
  })
)

That code has been commented out, but we need to deal with it.

[brozorec]

@ferostar

doing this I realized that even if I removed the infinite limit switch, the modal's text is all about it

Let's rewrite it as follows:
"Approve the router contract [ADDRESS](with an etherscan link) to use [XXX] from your wallet."

we also need to decide what to do with

I suggest we remove it and when the tx on the src chain gets confirmed, we re-fetch the allowance. Wdyt?