Admin Stats Dashboard — read endpoint with all aggregations

[Yurika-Kan]

Add /admin/stats dashboard: get live Mongo data, service, API, jest unit tests

🎫 Issue #487

▶ Changelist:

For http://localhost:3000/admin/stats

• Split StatusBreakdownChart into application, decision, and RSVP breakdowns as three separate cards
• Added getTotals, getStatusBreakdown, getDecisionBreakdown, getRsvpBreakdown, getDemographics, getTimeline aggregation functions against applicant_data
• Reworked types.ts to match applicant_data
• Cache + API route for stats payload, dynamic loading for /stats route
• Added jest config + unit tests per aggregation
• Pre-commit hook now fails fast if next dev is running (conflicts with yarn build)

🎥 Screenshots & Screencasts:

Stats Page with Mongo Prod applicant data!

📝 Notes + 🚧 TODO:

• Demographics dimension selector still TODO (see StatsDashboard)
• Fix chart x-xis overflow:

- Brainstorm better way to represent all the diff majors for x-axis:

Note: to access this page, user must log into platform with ...@hackbeanpot.com credentials!

🧪 Testing:

• yarn test — unit tests (mongodb-memory-server) covering:
  getTotals: counts across all status fields correct
  getStatusBreakdown: groups by applicationStatus
  getDecisionBreakdown: groups decisionStatus scoped to submitted applicants only
  getRsvpBreakdown: groups rsvpStatus scoped to admitted applicants only
  getTimeline: groups submissions by day
  getDemographics: groups school dimension from applicationResponses; returns empty rows for dimensions with no data
• double checked with Mongo values
• curl tested payload, counts, timeline
• smoke tested page

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Project	Deployment	Actions	Updated (UTC)
core-live	Ready	Preview	Jul 30, 2026 3:14am
core-main	Ready	Preview	Jul 30, 2026 3:14am