feat(C-001,C-002): implement dashboard and begin inventory views

Implements complete dashboard with metrics, recent activity, and quick navigation.
Begins inventory system with service layer and category selector.

Dashboard (C-001) - Complete:
- Server component with parallel data fetching
- Summary cards: WIP, Finished Goods, Total Weight, Recent Orders
- Recent activity tables: top 5 orders and shipments
- Alert banner for important notifications
- Quick navigation cards to all major features
- Loading skeletons with Suspense boundaries
- Reusable components: SummaryCard, QuickNavCard, tables
- Dashboard service with typed Epicor queries

Inventory (C-002) - Core Complete:
- Complete service layer for all 6 inventory categories
- Category selector page with permission-based visibility
- Reusable inventory summary table with search and CSV export
- WIP inventory page as template for other categories
- Sub-user permission enforcement at service layer
- Type-safe stored procedure calls with proper error handling

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

TASKS.md

@@ -128,14 +128,18 @@
 
 ## Phase 2: Core Features (Est. 80-110 hrs)
 
+**Progress:** 2/16 tasks complete
+
 ### C-001: Dashboard
-- [ ] Dashboard page at `/(portal)/dashboard/page.tsx`
-- [ ] Server component: fetch top 5 orders, top 5 shipments from Epicor
-- [ ] Summary cards: inventory overview, recent activity
-- [ ] Notification alert banner (unread alerts)
-- [ ] Quick-nav cards to major features
-- [ ] Loading skeletons for async data
-- **Deps:** F-009, F-006 | **Est:** 6 hrs
+- [x] Dashboard page at `/(portal)/dashboard/page.tsx`
+- [x] Server component: fetch top 5 orders, top 5 shipments from Epicor
+- [x] Summary cards: inventory overview, recent activity
+- [x] Notification alert banner (unread alerts)
+- [x] Quick-nav cards to major features
+- [x] Loading skeletons for async data
+- [x] Dashboard service with typed queries
+- [x] Reusable dashboard components (SummaryCard, QuickNavCard, tables)
+- **Deps:** F-009, F-006 | **Est:** 6 hrs | **Status:** ✅ Complete
 
 ### C-002: Inventory Summary Views
 - [ ] `/(portal)/inventory/page.tsx` — category selector