feat: implement consolidation approval process for shared-wagon bookings

- Add migration for consolidation approvals table and status enum
- Create ConsolidationApprovalService to handle approval logic
- Implement repository for managing consolidation approvals
- Add entity for consolidation approval with necessary fields
- Develop frontend components for displaying and managing consolidation approvals
- Create tests for consolidation approval service to ensure correct behavior

apps/edr-freight-api/src/modules/bookings/consolidation-approval.service.spec.ts

@@ -11,9 +11,8 @@ import { Booking } from './entities/booking.entity';
  * straight to Operations.
  *
  * The invariants that matter: both halves are held and released TOGETHER (a
- * decision on one side of a shared wagon is meaningless without the other), the
- * requester cannot approve their own pairing, and a decided pairing cannot be
- * decided twice.
+ * decision on one side of a shared wagon is meaningless without the other), and
+ * a decided pairing cannot be decided twice.
  */
 describe('ConsolidationApprovalService', () => {
   const PENDING = {
@@ -154,13 +153,19 @@ describe('ConsolidationApprovalService', () => {
     });
   });
 
-  it('refuses to let the requester approve their own pairing', async () => {
-    const { service, bookingsRepository } = makeService();
+  it('lets the requester approve their own pairing', async () => {
+    // No maker-checker separation: the permission alone decides who may approve,
+    // and the audit trail still records requester and approver separately.
+    const { service, approvals } = makeService();
 
-    await expect(
-      service.approve('ap-1', 'gl-user'),
-    ).rejects.toThrow(/must be approved by someone else/i);
-    expect(bookingsRepository.update).not.toHaveBeenCalled();
+    await service.approve('ap-1', 'gl-user');
+
+    expect(approvals.decide).toHaveBeenCalledWith(
+      'ap-1',
+      ConsolidationApprovalStatus.Approved,
+      'gl-user',
+      undefined,
+    );
   });
 
   it('requires a reason to reject', async () => {

apps/edr-freight-api/src/modules/bookings/consolidation-approval.service.ts

@@ -37,6 +37,10 @@ export const CONSOLIDATION_APPROVAL_PENDING = "CONSOLIDATION_APPROVAL_PENDING";
  * decision on one is meaningless without the other. Every request is kept,
  * decided or not: the table is the audit trail of who approved which pairing,
  * when, and why.
+ *
+ * No maker-checker separation: whoever holds the approve permission may decide a
+ * pairing, including the GL user who created it. The record of who requested and
+ * who decided is still kept either way.
  */
 @Injectable()
 export class ConsolidationApprovalService {
@@ -114,7 +118,6 @@ export class ConsolidationApprovalService {
     note?: string,
   ): Promise<{ booking: Booking; partner: Booking }> {
     const approval = await this.loadPending(approvalId);
-    this.assertDifferentPerson(approval, decidedBy);
 
     await this.dataSource.transaction(async () => {
       const claimed = await this.approvals.decide(
@@ -166,7 +169,6 @@ export class ConsolidationApprovalService {
       );
     }
     const approval = await this.loadPending(approvalId);
-    this.assertDifferentPerson(approval, decidedBy);
 
     await this.dataSource.transaction(async () => {
       const claimed = await this.approvals.decide(
@@ -237,19 +239,4 @@ export class ConsolidationApprovalService {
     }
     return approval;
   }
-
-  /**
-   * Maker–checker: the point of the gate is a second pair of eyes, so the GL
-   * user who created the pairing cannot also approve it.
-   */
-  private assertDifferentPerson(
-    approval: ConsolidationApproval,
-    decidedBy: string,
-  ): void {
-    if (approval.requestedBy && approval.requestedBy === decidedBy) {
-      throw new BadRequestException(
-        "You created this consolidation — it must be approved by someone else.",
-      );
-    }
-  }
 }

apps/edr-freight-web/backoffice/src/components/layout/sidebar-sections.tsx

@@ -12,6 +12,7 @@ import {
   Image as ImageIcon,
   LayoutDashboard,
   LayoutGrid,
+  Link2,
   MapPin,
   Network,
   Package,
@@ -95,6 +96,14 @@ export const buildSidebarSections = (
           icon: <FileText />,
           permission: FREIGHT_PERMS.bookings.view,
         },
+        // Shared-wagon gate: a consolidated pair waits for a human decision
+        // before either half reaches Operations.
+        {
+          label: "Shared wagon approvals",
+          href: "/dashboard/consolidation-approvals",
+          icon: <Link2 />,
+          permission: FREIGHT_PERMS.bookings.approveConsolidation,
+        },
         {
           label: "Wagon cancellations",
           href: "/dashboard/wagon-cancellations",