Use toString to convert value to BigNumber

[Imamah-Zafar]

🔘 PR Type

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• Bugfix
• Enhancement
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📜 Background

With the current implementation, we currently get the error Argument of type 'bigint' is not assignable to parameter of type 'Value'
Noticed this while testing secretkeylabs/sats-connect#25

🔄 Changes

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[github-actions]

Test with build here: https://github.com/secretkeylabs/xverse-web-extension/actions/runs/5729055579

[yknl]

Is this an issue on mobile @abdulhaseeb4239 ?

[abdulhaseeb4239]

Is this an issue on mobile @abdulhaseeb4239 ?

this is already handled in the app
https://github.com/secretkeylabs/xverse/blob/2f2f51b7b41383a5f951c17476ee8dfb6d2a5fa1/screens/browser/browser.tsx#L191