[frontend] - Invite friends flow sends duplicate invites without feedback

[Hydrax117]

Description

InviteFriends.tsx does not track which users have already been invited. Clicking "Invite" a second time sends another request without indicating the invite is already pending.

Acceptance Criteria

• After a successful invite, the button state changes to "Invited" and is disabled.
• The invited state persists for the session (local state or React Query cache).
• If the friend has already sent a request to the current user, the button shows "Accept request" instead.

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[444notdotun]

@444notdotun has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello, I have 4 years of experience delivering solutions for projects like this, covering backend, frontend, and smart contract development. After carefully reviewing your requirements, I have a clear understanding of the task and am confident in my ability to deliver a clean, efficient, and thoroughly tested solution on time. I prioritize code quality, maintainability, and industry best practices throughout the development process.
My PR will be submitted in under 10hours

ℹ️ Repo Maintainers: To accept this application, review their application or assign @444notdotun to this issue.

[Silver36-ship-it]

@Silver36-ship-it has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I would love to work on this professionally, please assign it to me

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[Petah1]

@Petah1 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

hi maintainer ! i would like to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Petah1 to this issue.

[drips-wave]

Congratulations, @Petah1! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

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