Feature / Gas Tank

[Maskln]

• Added cashbackStatusByAccount property to the Portfolio Controller to manage the state of when the Confetti banner and Confetti Modal should be visible.

• Added a getIsFirstCashbackReceived helper function to determine whether the first cashback has been received.

• Introduced a getFirstCashbackBanners function in banners.ts.

• Updated the SelectAccount Controller to use getFirstCashbackBanners for displaying a banner when a user receives their first cashback, if applicable.

• Added a unit test for the changes related to cashback, availableAmount, and saved. This test is currently disabled and will be enabled once the required Relayer changes are applied.

[superKalo]

We went though a few feedback cycles and I'm now happy with the final state.

I left a few final minor notes, but I approve the PR.

PS: Please fix the failing unit test before you merge it.

FAIL src/controllers/main/main.test.ts
  ● Test suite failed to run

    src/libs/estimate/estimate.ts:423:61 - error TS23[39](https://github.com/AmbireTech/ambire-common/actions/runs/13158008405/job/36719500082?pr=1135#step:6:40): Property 'availableAmount' does not exist on type 'TokenResult'.

    423       const availableAmount = token.flags.onGasTank ? token.availableAmount || token.amount : feeTokenOutcomes[key].amount
                                                                    ~~~~~~~~~~~~~~~