fix: vite buffer polyfill in frontend-only example

[moaazsidat]

Motivation

frontend-only example has a bug where it's missing the Buffer polyfill resulting in the following error

Change Summary

Adds vite-plugin-node-polyfills package to frontend-only example and updates vite config to use the buffer polyfill

Merge Checklist

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Additional Context

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[horsefacts]

Thank you!