fix(mfi-v2-ui): account labels

[chambaz]

Phantom wallet adapter returns an object w signature from signMessage, add support and fix account label update.

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Name	Status	Preview	Comments	Updated (UTC)
marginfi-landing-page	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 20, 2024 1:46am
marginfi-v2-trading	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 20, 2024 1:46am
marginfi-v2-ui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 20, 2024 1:46am

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
marginfi-v2-docs	⬜️ Skipped (Inspect)			Oct 20, 2024 1:46am

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_{Last updated for commit e739ab7. This comment will update as new commits are pushed.}