feat: add dashboard overview stats endpoint and UI integration

- Implemented `GET /dashboard/stats` in `DashboardController` to provide aggregate counts for stock, GRN, and procurement.
- Created `DashboardStatsDto` and `WarehouseValuationDto` to structure the response data.
- Developed `DashboardService` to fetch and compute necessary statistics from the database.
- Added `IDashboardService` interface for service abstraction.
- Introduced API client methods in `dashboard.ts` for frontend consumption of the new endpoint.
- Defined TypeScript types for dashboard data in `dashboard.ts` to ensure type safety in the frontend.
- Updated UI components in the frontend to reflect changes in the dashboard, including styling adjustments and removal of unused icons.

docs/11-BACKEND-PHASE1.md

@@ -713,6 +713,28 @@ Items at/below ROP (FR-STK-10); computed on read, no stored entity.
 ```
 `POST /stock/reorder-alerts/{itemId}/requisition?warehouseId=1` → creates a draft requisition for the suggested qty.
 
+### 5.8 Dashboard overview (added 2026-07-28)
+#### `GET /dashboard/stats`
+Cross-domain aggregate counts for the dashboard UI — a single computed-on-read object, not a stored entity or a `PagedResponse<T>` list (same posture as reorder alerts, §5.7). `lowStockAlerts` reuses `IReorderService.GetAlertsAsync` rather than re-deriving the FIFO-available-vs-reorder-point comparison; `onHandTotal`/`onHandWarehouses`/`stockValuationTotal`/`stockValuationByWarehouse` are SQL-side `SUM`/`GROUP BY` over `StockLayer` (cheap — unlike reorder alerts, they need no per-item live lookup).
+```json
+{
+  "lowStockAlerts": 6,
+  "onHandTotal": 15420,
+  "onHandWarehouses": 3,
+  "stockValuationTotal": 4820500.00,
+  "stockValuationByWarehouse": [
+    { "warehouseId": 1, "total": 3120000.00 },
+    { "warehouseId": 2, "total": 1700500.00 }
+  ],
+  "pendingApprovalPurchaseOrders": 2,
+  "pendingGrns": 4,
+  "openRequisitions": 5,
+  "pendingCounts": 1,
+  "openRfqs": 3
+}
+```
+`pendingApprovalPurchaseOrders` = PO status `PendingApproval`; `pendingGrns` = GRN status `Draft`; `openRequisitions` = Requisition status `Submitted`; `pendingCounts` = StockCount status `Counted` (counted but not yet posted); `openRfqs` = RFQ status `Open`. **Not covered here:** GRN inspection-hold counts (`HoldStatus` lives on GRN lines, no list/count endpoint exposes it yet) and recent stock movements (just call `GET /stock/ledger` directly with a small `pageSize` — no aggregation needed).
+
 ---
 
 ## 6. Reference Data