feat: major dashboard & waiter PWA overhaul

- Manager dashboard: replaced monolithic DashboardTab/OperationsPage with new
  DashboardPage; added OrderDetailModal, ShiftDetailModal, DeleteConfirmModal,
  PaymentMethodModal; updated Sidebar routing and App navigation
- Reports: reworked WorkDaySummary, OrderHistory, ShiftsOverview with detail modals
- Backend routers: extended orders, reports, shifts, products, business_day endpoints;
  updated cloud_sync service
- Waiter PWA: refreshed app icons, improved ConnectionLostModal UX, updated
  TableCard, SSEContext, connectionStore; added useProductCache hook; vite config tweaks

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

local_backend/routers/products.py

@@ -17,9 +17,14 @@ from schemas.product import (
     CategoryReparentRequest,
 )
 from routers.deps import get_current_user, require_manager
+from services.sse_bus import broadcast_sync
 
 router = APIRouter()
 
+
+def _broadcast_products_changed():
+    broadcast_sync("products_changed", {})
+
 IMAGE_DIR = "/app/data/product_images"
 
 
@@ -118,6 +123,7 @@ def create_category(body: CategoryCreate, db: Session = Depends(get_db), user: U
     db.add(cat)
     db.commit()
     db.refresh(cat)
+    _broadcast_products_changed()
     return cat
 
 
@@ -128,6 +134,7 @@ def reorder_categories(items: List[CategoryReorderItem], db: Session = Depends(g
         if cat:
             cat.sort_order = item.sort_order
     db.commit()
+    _broadcast_products_changed()
 
 
 @router.put("/categories/reorder-subcategories", status_code=status.HTTP_204_NO_CONTENT)
@@ -138,6 +145,7 @@ def reorder_subcategories(items: List[SubcategoryReorderItem], db: Session = Dep
         if cat:
             cat.sort_order = item.sort_order
     db.commit()
+    _broadcast_products_changed()
 
 
 @router.put("/categories/reorder-general", status_code=status.HTTP_204_NO_CONTENT)
@@ -148,6 +156,7 @@ def reorder_general(items: List[ParentGeneralReorderItem], db: Session = Depends
         if cat:
             cat.general_sort_order = item.general_sort_order
     db.commit()
+    _broadcast_products_changed()
 
 
 @router.put("/categories/{category_id}/reparent", response_model=CategoryOut)
@@ -176,6 +185,7 @@ def reparent_category(category_id: int, body: CategoryReparentRequest, db: Sessi
     cat.sort_order = sibling_count
     db.commit()
     db.refresh(cat)
+    _broadcast_products_changed()
     return cat
 
 
@@ -188,6 +198,7 @@ def update_category(category_id: int, body: CategoryUpdate, db: Session = Depend
         setattr(cat, field, value)
     db.commit()
     db.refresh(cat)
+    _broadcast_products_changed()
     return cat
 
 
@@ -198,6 +209,7 @@ def delete_category(category_id: int, db: Session = Depends(get_db), user: User
         raise HTTPException(status_code=404, detail="Category not found")
     db.delete(cat)
     db.commit()
+    _broadcast_products_changed()
 
 
 # ── Products ──────────────────────────────────────────────────────────────────
@@ -218,6 +230,7 @@ def reorder_products(items: List[ProductReorderItem], db: Session = Depends(get_
         if product:
             product.sort_order = item.sort_order
     db.commit()
+    _broadcast_products_changed()
 
 
 @router.post("/", response_model=ProductOut, status_code=status.HTTP_201_CREATED)
@@ -255,6 +268,7 @@ def create_product(body: ProductCreate, db: Session = Depends(get_db), user: Use
     _replace_preference_sets(db, product, body.preference_sets)
     db.commit()
     db.refresh(product)
+    _broadcast_products_changed()
     return product
 
 
@@ -275,6 +289,7 @@ def update_product(product_id: int, body: ProductUpdate, db: Session = Depends(g
         _replace_preference_sets(db, product, body.preference_sets)
     db.commit()
     db.refresh(product)
+    _broadcast_products_changed()
     return product
 
 
@@ -305,6 +320,7 @@ async def upload_product_image(product_id: int, file: UploadFile = File(...), db
     product.image_url = f"/static/product_images/{filename}"
     db.commit()
     db.refresh(product)
+    _broadcast_products_changed()
     return product
 
 
@@ -329,3 +345,4 @@ def delete_product(product_id: int, hard: bool = False, db: Session = Depends(ge
         else:
             db.delete(product)
     db.commit()
+    _broadcast_products_changed()