Add token amount formatting with decimal precision

[ogazboiz]

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Description

Soroban token amounts are i128 integers (smallest unit, like stroops for XLM or units for USDC at 7 decimals). The frontend currently has no utilities for converting between raw on-chain values and human-readable amounts.

What Needs to Happen

• Create frontend/src/utils/amount.ts with:
  • fromStroops(amount: bigint, decimals: number): string
  • toStroops(amount: string, decimals: number): bigint
  • formatStreamRate(ratePerSecond: bigint, decimals: number): string (e.g., "0.0001 USDC/sec")
  • hasValidPrecision(amount: string, decimals: number): boolean
• Apply to all amount inputs and displays throughout the app
• Fetch token decimals from contract once and cache per token address

Files

• frontend/src/utils/amount.ts (create)

Acceptance Criteria

• All amounts display in human-readable format
• Inputs reject invalid precision
• Stream rate shown per second and per month

[muhahahmad68]

@muhahahmad68 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Kindle assign this to me, I'd like to work on it

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[Praizfotos]

@Praizfotos has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I'd love to work on this please

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[Smartdevs17]

@Smartdevs17 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

can i work on this?

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Congratulations, @Smartdevs17! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

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[drips-wave]

This issue has been completed by @Smartdevs17 as part of the Stellar Wave Program's 4th Wave 🥳

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