Feature: Add customer reviews system with admin management

- Add Review model to database with approval workflow
- Customers can submit reviews with 1-5 star ratings
- Admin can approve, reject, or delete reviews
- Public reviews page showing all approved reviews with rating stats
- ReviewForm component for easy integration on product pages
- Bulk gallery upload now properly tracked

Chore: Add expected delivery date for design approvals

- Add expectedDeliveryDate field to DesignApproval model
- Admin can set delivery date when approving designs
- Improves customer communication and expectations

Chore: Add welcome back message for logged-in customers

- Display personalized greeting on account page after login
- Shows customer's name if available

Chore: Add color difference disclaimer to product pages

- Added to StandardProductView (ready-made products)
- Added to DesignCanvas (personalized products)
- Informs customers about lighting-based color variations
- Helps manage customer expectations

Feature: Add image identification in design specifications

- Images now clearly labeled as "Image 1", "Image 2", etc.
- Images marked with purple circles in specification diagrams
- Improves clarity for production team

Documentation: Add comprehensive database optimization guide

- DATABASE_OPTIMIZATION.md - Full optimization strategies
- DATABASE_OPTIMIZATION_QUICK_START.md - Implementation examples
- DATABASE_OPTIMIZATION_MIGRATION.sql - Ready-to-run indexes
- Covers indexing, pagination, caching, and monitoring

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

prisma/schema.prisma

@@ -60,6 +60,7 @@ model Product {
   proofs            DesignProof[]
   customRequests    CustomRequest[]
   designApprovals   DesignApproval[]
+  reviews           Review[]
   promotions        Promotion[] // only relevant to promotions scoped to specific items, not "all items"
   collections       Collection[] // occasion/recipient tags, e.g. "Christmas", "For Teachers"
   manualSaleItems   ManualSaleItem[]
@@ -199,6 +200,7 @@ model DesignApproval {
   color                String
   size                 String?
   status               String   @default("PENDING") // PENDING | IN_REVIEW | APPROVED | REJECTED
+  expectedDeliveryDate DateTime? // admin sets this when approving the design
   messages             DesignApprovalMessage[]
   createdAt            DateTime @default(now())
   updatedAt            DateTime @updatedAt
@@ -268,6 +270,7 @@ model Customer {
   customRequests     CustomRequest[]
   manualSales        ManualSale[]
   designApprovals    DesignApproval[]
+  reviews            Review[]
 }
 
 // A sale that didn't go through the website checkout — cash at a fair, a bank
@@ -547,6 +550,23 @@ model BankReconciliation {
   notes               String?  // manual notes about the match
 }
 
+// Customer reviews for products
+model Review {
+  id          String   @id @default(cuid())
+  customerId  String?  // null for guest customers
+  customer    Customer? @relation(fields: [customerId], references: [id], onDelete: SetNull)
+  customerEmail String
+  customerName String?
+  productId   String
+  product     Product  @relation(fields: [productId], references: [id], onDelete: Cascade)
+  rating      Int      // 1-5 stars
+  title       String   // short headline
+  comment     String   // full review text
+  approved    Boolean  @default(false) // must be approved by admin before showing publicly
+  createdAt   DateTime @default(now())
+  updatedAt   DateTime @updatedAt
+}
+
 // Shipping rates configuration — managed from admin panel
 // Allows easy updates to Royal Mail pricing without code changes
 model ShippingRate {