fix: stabilize guild monthly leaderboards

[ugcodrr]

Summary

• preserve cached per-day guild GEXP totals when recomputing rolling daily/weekly/monthly values
• prevent monthly/scaled monthly GEXP from dropping when member history disappears from the current Hypixel guild member list
• keep guild leaderboard rendering resilient when a stale leaderboard id maps to a missing or partial guild document
• reuse the shared exp-history merge helper for member history so the cached/current GEXP merge avoids per-day object spreading and extra allocations

Root Cause

Guild monthly GEXP was recomputed only from the current Hypixel member list. If a member left, or if current member history omitted a day that was previously cached, that contribution disappeared from the recomputed 30-day aggregate and Redis leaderboard scores could be updated downward without an actual monthly reset.

The member-level cached/current history merge also rebuilt the accumulator object on every cached day. Reusing the same helper used by the guild-level preserved totals keeps the stabilization behavior intact while reducing temporary allocations during guild refreshes.

Testing

• pnpm --filter api test:types
• pnpm vitest --project api

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
statsify	Skipped		May 30, 2026 10:03am

[Copilot]

Pull request overview

This PR stabilizes guild GEXP leaderboard calculations by preserving cached guild history during refreshes and making guild leaderboard rows more resilient to stale ids.

Changes:

• Adds an API Vitest config so in-source API tests can run.
• Refactors exp-history conversion into a helper and preserves cached guild daily totals with max-per-day merging.
• Makes guild leaderboard additional stats tolerate missing guild documents.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
apps/api/vitest.config.ts	Adds Vitest configuration for the API app.
apps/api/src/guild/guild.service.ts	Adds shared exp-history helpers, combines cached/current guild GEXP history, and tests the preservation behavior.
apps/api/src/guild/leaderboards/guild-leaderboard.service.ts	Falls back safely when leaderboard ids point to missing guild documents.

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