improvement: appointment dialog UX improved.

backend/src/modules/patients/dto/create-patient.dto.ts

@@ -1,6 +1,14 @@
+import { Transform } from 'class-transformer';
 import { IsDateString, IsEmail, IsOptional, IsString, MaxLength, MinLength } from 'class-validator';
 import { ErrorCode } from '../../../common/errors';
 
+function emptyStringToUndefined({ value }: { value: unknown }): unknown {
+  if (typeof value === 'string' && value.trim() === '') {
+    return undefined;
+  }
+  return value;
+}
+
 export class CreatePatientDto {
   @IsString()
   @MinLength(1, { message: ErrorCode.VALIDATION_FIELD_REQUIRED })
@@ -18,6 +26,7 @@ export class CreatePatientDto {
   mobile: string;
 
   @IsOptional()
+  @Transform(emptyStringToUndefined)
   @IsEmail({}, { message: ErrorCode.VALIDATION_EMAIL_INVALID })
   email?: string;