fix(mfi-ui): better error handeling for simulating & processing transactions

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Name	Status	Preview	Comments	Updated (UTC)
marginfi-landing-page	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 26, 2024 7:11pm
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| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **marginfi-v2-docs** | ⬜️ Skipped ([Inspect](https://vercel.com/mrgn/marginfi-v2-docs/7zZFKra9PWszXGqiF7H3hvFijkb5)) | | | Nov 26, 2024 7:11pm |

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_{Last updated for commit 9874e43. This comment will update as new commits are pushed.}