feat(freight-api): seal EDR side of contracts with the one global stamp

apps/edr-freight-api/src/contracts/contract-view-model.builder.ts

@@ -9,6 +9,7 @@ import {
 import { ContractPricingScheduleBuilder, PricingSchedule } from './contract-pricing-schedule.builder';
 import { ContractRateScheduleBuilder, RateSchedule } from './contract-rate-schedule.builder';
 import { ContractTemplateResolver } from './contract-template.resolver';
+import { StampSettingsService } from '../modules/stamp-settings/stamp-settings.service';
 import { ContractTemplateMeta, getTemplateMeta } from './contract-template.registry';
 
 export interface ContractSignatureView {
@@ -16,6 +17,11 @@ export interface ContractSignatureView {
   signerDisplayName: string;
   signedAt: string;
   signatureImageUrl?: string | null;
+  /**
+   * Round company seal shown beside the signature. Populated for the EDR
+   * (STAFF) side only, from the single global stamp — see attachProviderStamp.
+   */
+  stampImageUrl?: string | null;
 }
 
 /**
@@ -114,6 +120,7 @@ export class ContractViewModelBuilder {
     private readonly templateResolver: ContractTemplateResolver,
     private readonly pricingBuilder: ContractPricingScheduleBuilder,
     private readonly rateScheduleBuilder: ContractRateScheduleBuilder,
+    private readonly stampSettings: StampSettingsService,
   ) {}
 
   async build(bookingId: string): Promise<{ booking: Booking; view: ContractViewModel }> {
@@ -194,7 +201,30 @@ export class ContractViewModelBuilder {
 
   private async loadSignatures(bookingId: string): Promise<ContractSignatureView[]> {
     const rows = await this.bookingsRepository.findContractSignatures(bookingId);
-    return rows.map((s) => this.toSignatureView(s));
+    const views = rows.map((s) => this.toSignatureView(s));
+    await this.attachProviderStamp(views);
+    return views;
+  }
+
+  /**
+   * Stamp the EDR side of the contract with the ONE global company stamp
+   * (StampSettingsService) — staff never upload or pick a stamp, so nothing is
+   * stored per signature and the seal is read live at render time. The client
+   * side is left alone: a customer's own stamp is their business.
+   *
+   * Read live and deliberately not snapshotted, so replacing the company stamp
+   * re-seals contracts on their next render. `getStampImageUrl()` never throws
+   * and returns a data URL, which `signatures_block.hbs` renders as-is and the
+   * signature inliner skips.
+   */
+  async attachProviderStamp(signatures: ContractSignatureView[]): Promise<void> {
+    const staff = signatures.filter((s) => s.role === 'STAFF');
+    if (staff.length === 0) return;
+
+    const stampImageUrl = await this.stampSettings.getStampImageUrl();
+    for (const sig of staff) {
+      sig.stampImageUrl = stampImageUrl;
+    }
   }
 
   toSignatureView(row: BookingContractSignature): ContractSignatureView {