fix claim validation and expert branch scoping

src/request-management/dto/expert-complete-claim-data.dto.ts

@@ -1,4 +1,11 @@
 import { ApiPropertyOptional } from "@nestjs/swagger";
+import {
+  ArrayMinSize,
+  ArrayUnique,
+  IsArray,
+  IsInt,
+  IsOptional,
+} from "class-validator";
 import { CarDamagePartDto } from "src/claim-request-management/dto/car-part.dto";
 
 /**
@@ -6,6 +13,19 @@ import { CarDamagePartDto } from "src/claim-request-management/dto/car-part.dto"
  * All fields optional so expert can submit in one or two steps (e.g. car parts first, then sheba/other).
  */
 export class ExpertCompleteClaimDataDto {
+  @ApiPropertyOptional({
+    description:
+      "Selected damaged-part IDs from the live Fanavaran car-components catalog.",
+    example: [9, 10, 30],
+    type: [Number],
+  })
+  @IsOptional()
+  @IsArray({ message: "selectedPartIds must be an array" })
+  @ArrayMinSize(1, { message: "At least one part ID must be selected" })
+  @ArrayUnique({ message: "Duplicate part IDs are not allowed" })
+  @IsInt({ each: true, message: "Each selected part ID must be an integer" })
+  selectedPartIds?: number[];
+
   @ApiPropertyOptional({
     description: "Car part damage selection (same as selectCarPartDamage). Required for first claim data step.",
     type: CarDamagePartDto,