Stats Dashboard File Creation

[adityapat24]

Goal

Create the files for the new redesigned stats dashboard. No real logic yet, stubs only.

The shared (admin)/layout.tsx is created by Ticket 5. This ticket only adds the stats page inside it.

Folders to create

• src/app/(admin)/admin/stats/
• src/app/api/v1/stats/
• src/lib/stats/
• src/components/admin/stats/

Files to create

Routes

• src/app/(admin)/admin/stats/page.tsx — redesigned stats dashboard
• src/app/api/v1/stats/route.ts — GET aggregate stats; stub returns mock shape

Library

• src/lib/stats/aggregations.ts — Mongo aggregation pipelines (counts by status, school, etc.)
• src/lib/stats/service.ts — getStats() returning typed StatsPayload
• src/lib/stats/types.ts — StatsPayload, StatusBreakdown, DemographicsBreakdown, TimelinePoint types

Components

• src/components/admin/stats/StatsDashboard.tsx — top-level layout, grid of stat cards + charts
• src/components/admin/stats/StatCard.tsx — single metric tile (label, value, delta)
• src/components/admin/stats/StatusBreakdownChart.tsx — pie/donut: applicants by status
• src/components/admin/stats/DemographicsChart.tsx — bar chart: school / year / etc.
• src/components/admin/stats/SubmissionTimeline.tsx — line chart: submissions over time

Acceptance criteria

• All folders and files listed above exist and the project compiles.
• /admin/stats renders the dashboard with mock data and placeholder charts.
• GET /api/v1/stats returns a typed mock StatsPayload.