[FRONTEND] Join tournament page uses fake setTimeout payment and ignores URL param

[Hydrax117]

File: src/app/tournaments/[id]/join/page.tsx
Priority: Major
Type: Bug / Missing Feature

Description:
Two problems exist: (1) handlePayAndJoin simulates payment with a setTimeout and a toast — no real payment gateway is called. (2) params.id is read but only used as a fallback default value; the page always shows the same hardcoded tournament regardless of which ID is in the URL.

Acceptance criteria:

• Tournament data is fetched/looked up using params.id
• Paid tournaments integrate with the real payment gateway
• Team assignment is persisted (API call or at minimum stored in state that survives navigation)
• Loading and error states are handled

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Congratulations, @Ahmedscreativeverse! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

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