Shared Layer Extraction Plan

Goal

Gradually move the repository from a miniapp-local utility model to a reusable shared-package model.

Current Problem

apps/miniapp/utils/demo-data.js used to mix the following responsibilities:

• base mock data
• local state persistence
• date utilities
• pure mapping functions
• page-facing selectors
• domain projection logic

Target Split

Into packages/types

Stable contracts:

• student
• teacher
• course
• enrolled course
• lesson
• assessment
• notification
• membership plan
• activity
• payment order
• demo state

Into packages/shared

Pure logic:

• formatDateKey
• week-range handling
• schedule sorting
• score conversion
• message sorting
• course and lesson mapping logic