feat: add tooltip and change message

[anxolin]

Summary

Changes the text for the smart slippage and adds a tooltip

Implementation details

This PR will use BFF for estimating the slippage tolerance. Specifically uses this: cowprotocol/bff#84

This implementation has been deployed to BARN, so it should have #84 applied:
https://bff.barn.cow.fi/1/markets/0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2-0x2260fac5e5542a773aa44fbcfedf7c193bc2c599/slippageTolerance

Test

Select different markets, and check how it change the default slippage suggested by the app.

Make sure the trades go trough even for illiquid markets.

It might be helpful to check coingecko to understand why sometimes is the number higher, like in AAVE token (1.84%)

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[alfetopito]

I know it's not part of this PR, but since we are now actually setting the slippage dynamically, we should at least inform about that IMO.

I see the value when I set it myself

Another point is that, once I manually edited it, I don't know there's a proposed value.
Would be great to show the option to change it if different from selection.

Also in the confirmation screen would be a good place to point out this value was dynamically suggested

Anyway, looks good as is, but would like to add those changes on top

[elena-zh]

Hey @anxolin , in additions to @alfetopito comments, I'd like to add one more tooltip where it would be nice to change wording:

At least, remove 'your' from the text

[elena-zh]

Hey @anxolin , I noticed that a dynamic slippage is not applied to ETH orders. See: weth-xai token pair in Arb has 1.38% slippage while eth-xai has 0.5. Is this an expected behavior for now?

Bff returns same value for both requests, but on the FE is it not overwritten

[anxolin]

Yes @alfetopito I agree with your points. I also thought this was not nicely communicated. I guess we will need to follow up and add it.

I think we should always show the suggested slippage, even when it is overridden, so the user knows how their slippage compares to the suggested one. Also could provide a quick way to select the suggested one. All these things need to be a bit reviewed, maybe with @fairlighteth supervision

@elena-zh for the tooltip, no problem.
For ETH Flow, I think we shouldn't override it anymore if something we can improve the BFF slippage calculation so orders selling ETH would add some extra buffer. So we will need to:

• FE: Stop overriding this when we have a slippage suggestion
• BFF: Potentially, take into account ETH Flow needs more time to settle, so this is taken into account in the estimation

[anxolin]

This is a follow up I don't think I will manage to get in time, but I just kick started it #4826