Run the fraud-detection access check for all conference joins in LeaderboardConference

[RUKAYAT-CODER]

Overview
In src/components/leaderboard/LeaderboardConference.tsx the list 'Join' button (lines 247-251) calls setActiveConference directly, bypassing the handleJoinConference fraud/lock checks (lines 86-114) that the design intends, so locked or disallowed rooms can still be entered. Route all joins through handleJoinConference.

[blessme247]

@blessme247 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I would like to work on this issue

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[abdullahilateefat03-boop]

@abdullahilateefat03-boop has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello,

I'd love the opportunity to work on this issue. I have experience building software across different parts of the stack and always aim to write clean, maintainable, and well-tested code. If assigned, I'll communicate my progress regularly, ask questions when clarification is needed, and ensure the implementation is thoroughly tested before submitting a PR.

Thank you for your consideration.

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[Caneryy]

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

Hello, can I work on this issue?

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[drips-wave]

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

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