fix(mrgn-ui): add fallbacks to failing oracle prices from crossbar

[borcherd]

this includes:

• fallbacks when oracle price fails
• NaN catching
• stake page fixes

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Name	Status	Preview	Comments	Updated (UTC)
marginfi-v2-trading	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 12, 2024 2:46pm
marginfi-v2-ui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 12, 2024 2:46pm

2 Skipped Deployments

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **marginfi-landing-page** | ⬜️ Skipped ([Inspect](https://vercel.com/mrgn/marginfi-landing-page/AFLpzoZ1yPeYLv89f7JVQqWKd7NC)) | | | Nov 12, 2024 2:46pm | | **marginfi-v2-docs** | ⬜️ Skipped ([Inspect](https://vercel.com/mrgn/marginfi-v2-docs/4CB8T6natsRFrBCQFZUSaxwZ8iX4)) | | | Nov 12, 2024 2:46pm |

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_{Last updated for commit 5f71140. This comment will update as new commits are pushed.}