Expose loading and error state from the useInvoiceStream hook

[Kingsman-99]

Description

useInvoiceStream returns invoice event data but does not expose a loading flag or an error field. UI components cannot distinguish between "no events yet" and "stream failed", leading to silent error states.

Acceptance Criteria

• The hook return value includes loading: boolean (true until first event or error)
• The hook return value includes error: Error | null
• On stream error, loading becomes false and error is populated
• Unit tests pass

Context

• Target file: src/ui/hooks/useInvoiceStream.ts
• Do not change the existing data field names in the return value

[Emmycivity]

@Emmycivity has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Having carefully examined the details, I’m confident I can resolve the issue effectively while keeping the solution clean and efficient.

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[williamsokperez-arch]

@williamsokperez-arch has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

id love to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @williamsokperez-arch to this issue.

[drips-wave]

Congratulations, @williamsokperez-arch! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@williamsokperez-arch's PR #791 was approved and merged by @Kingsman-99.

🏆 @williamsokperez-arch: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (532 total points). Track your full progress on GrantFox.

👏 Great work, @williamsokperez-arch! Keep contributing to Stellar-split.

[drips-wave]

This issue has been completed by @williamsokperez-arch as part of the Stellar Wave Program's 8th Wave 🥳

😎 @williamsokperez-arch: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

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