[#1041] Add pagination to leaderboard

[realproject7]

Summary

• API accepts page (default 1) and limit (default 20, max 50) query params
• API returns totalParticipants, page, totalPages, limit in response
• Component shows Prev/Next controls with current page / total pages
• User rank always displayed when outside current page
• React Query key includes page number for per-page caching

Fixes #1041

Test plan

• Verify /api/airdrop/leaderboard?page=1&limit=20 returns correct pagination metadata
• Verify page 2 returns entries ranked 21–40
• Verify Prev/Next buttons enable/disable correctly at boundaries
• Verify user rank shows when user is not on current page

🤖 Generated with Claude Code

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
plotlink	Ignored		May 4, 2026 1:28pm

[realproject7]

re2 review: APPROVE — Clean pagination implementation. API correctly clamps page/limit params, paginates the sorted array with proper rank offsets, and scopes the username lookup to current-page addresses only. Component uses per-page React Query keys, properly disables Prev/Next at boundaries, and distinguishes empty-page from zero-participants. No issues found.

[project7-interns]

Verdict: APPROVE

Summary

The PR adds leaderboard pagination as requested: the API accepts page/limit, returns pagination metadata, and the component uses per-page React Query caching with Prev/Next controls and rank display outside the current page. The change is focused on issue #1041.

Findings

• None.

Decision

Approved. Acceptance criteria are met, and CI passes (lint-and-typecheck, e2e, Vercel checks).