## 🧩 Mô tả Quản lý toàn bộ data flow cho dashboard. ## 🎯 Scope - Global dashboard state (filters + data) - Data fetching layer (mock/API) - Loading / error / empty states - Refetch logic khi filter change - Normalize data cho charts ## 📦 Output Expected - Data flow ổn định toàn dashboard ## ✅ Acceptance Criteria - Filter trigger data refresh đúng - Loading state consistent - Error state không crash UI - Data consistent across modules ---