fix(mfi-v2-ui): various fixes

[chambaz]

• chore: use session storage to hide new asset banner
• fix: add referral link to accounts with null points data

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
marginfi-landing-page	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 5, 2024 5:31pm
marginfi-v2-ui	🛑 Canceled (Inspect)			Feb 5, 2024 5:31pm
omni	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 5, 2024 5:31pm

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_{Last updated for commit 5795578. This comment will update as new commits are pushed.}