Create shared token amount formatting utilities

[ogazboiz]

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Description

On-chain amounts are raw i128 integers. Each component handles formatting differently (or not at all), leading to inconsistencies and potential precision loss.

What Needs to Happen

• Create frontend/lib/amount.ts:
  • formatAmount(raw: bigint, decimals: number): string
  • parseAmount(display: string, decimals: number): bigint
  • formatRate(ratePerSec: bigint, decimals: number): string — "0.0001 USDC/sec" and "8.64 USDC/day"
  • hasValidPrecision(input: string, decimals: number): boolean
  • toStroops(value: string): bigint
• Apply consistently across StreamCreationWizard, dashboard cards, stream detail, LiveCounter

Files

• frontend/lib/amount.ts (create)

Acceptance Criteria

• All displays use the shared utility
• Inputs reject invalid precision
• Rate shown per second and per day

[Emmanuelluxury]

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I’m interested in working on this issue because it sits at the intersection of system reliability and developer experience—areas I care about deeply. Issues around package management, upgrades, and environment consistency can quietly slow teams down or introduce hard-to-debug problems. Fixing them not only improves stability but also makes the workflow smoother for everyone who depends on the tool.

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[khanavi272-spec]

@khanavi272-spec has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I would like to work on this issue

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[anonfedora]

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

I'm Anonfedora, I have vast experience in contributing and building on the Stellar ecosystem with the Rust using soroban's SDK.
I'm also good at comprehensively testing features.
ETA: < 12 hours

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

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