Replace the stubbed useProfileUpdate timeout with a real API call

[RUKAYAT-CODER]

Overview
src/app/hooks/useProfileUpdate.ts updateProfile does await new Promise(r => setTimeout(r, 1000)) and returns a synthesized success response — the TODO confirms it is a stub, so profile edits appear to save but persist nothing. Replace with a real apiClient call and propagate server-side validation errors to the form.

[omosvico]

@omosvico has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi maintainer, can this task be assigned to me?

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[drips-wave]

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

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