fix: prevent leaderboard rank numbers flashing wrong positions on initial load

[Priyanka0205-CSE]

Fixes #552

Root Cause

The leaderboard uses Firestore onSnapshot which fires twice on page load:

1. First with cached data (instant) — may be unsorted/stale
2. Then with server data — correct and authoritative

The loading state was cleared after the first callback (cache), causing rank numbers to flash incorrect positions for 1-2 seconds before jumping to the correct order.

Fix

Added a snapshot.metadata.fromCache check so the loading spinner is only hidden when data arrives from the Firestore server, not from cache.

Change

• src/pages/GitRank.jsx — wrap setLoadingUsers(false) in if (!snapshot.metadata.fromCache)

[vercel]

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Project	Deployment	Actions	Updated (UTC)
ranker-hub	Ready	Preview, Comment	Jun 17, 2026 5:12am