fix(lib): update fields to accept null

libs/common/src/lib/dtos/update-user-setting.dto.ts

@@ -96,13 +96,21 @@ export class UpdateUserSettingDto {
   @IsOptional()
   locale?: string;
 
+  /**
+   * The target financial amount the user aims to reach before retiring.
+   * Can be explicitly set to null to clear the value and calculate it dynamically.
+   */
   @IsNumber()
   @IsOptional()
-  projectedTotalAmount?: number;
+  projectedTotalAmount?: number | null;
 
+  /**
+   * The target date when the user plans to retire.
+   * Can be explicitly set to null to clear the value and calculate it dynamically.
+   */
   @IsISO8601()
   @IsOptional()
-  retirementDate?: string;
+  retirementDate?: string | null;
 
   @IsNumber()
   @IsOptional()