fix(credit-bureau): keep customer enquiry list stable and add back navigation in alert detail

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/app/credit-bureau/cic-alert-detail/cic-alert-detail.component.html

@@ -12,6 +12,12 @@
       <div class="cic-empty">Loading…</div>
     }
     @if (alert) {
+      @if (history.length) {
+        <div class="cic-alert info" style="margin-bottom: 12px">
+          You are viewing another enquiry of this customer.
+          <button class="cic-btn sm" style="margin-left: 8px" (click)="back()">← Back to previous enquiry</button>
+        </div>
+      }
       <div style="display: flex; justify-content: space-between; gap: 12px; align-items: flex-start">
         <div>
           <h3 style="margin-bottom: 4px">
@@ -160,8 +166,8 @@
       @if (alert.otherAlertsOfCustomer?.length) {
         <div class="cic-card" style="margin-top: 14px; margin-bottom: 0">
           <h2>
-            Other enquiries on this customer
-            <span class="cic-card-sub">{{ alert.otherAlertsOfCustomer?.length }} more</span>
+            All enquiries on this customer
+            <span class="cic-card-sub">{{ customerEnquiries.length }} in total</span>
           </h2>
           <div class="cic-table-wrap">
             <table class="cic-table">
@@ -174,10 +180,19 @@
                 </tr>
               </thead>
               <tbody>
-                @for (o of alert.otherAlertsOfCustomer; track o.id) {
-                  <tr class="clickable" (click)="alertId = o.id; load()">
+                @for (o of customerEnquiries; track o.id) {
+                  <tr
+                    class="clickable"
+                    [style.background]="o.id === alert.id ? '#eef4ff' : null"
+                    (click)="o.id !== alert.id && openOther(o.id)"
+                  >
                     <td>{{ o.enquiryDate | date: 'dd MMM yyyy' }}</td>
-                    <td>{{ o.loanType }}</td>
+                    <td>
+                      {{ o.loanType }}
+                      @if (o.id === alert.id) {
+                        <b>(shown above)</b>
+                      }
+                    </td>
                     <td class="num">{{ o.amount | number: '1.0-0' }}</td>
                     <td>
                       <span class="cic-badge" [class]="'cic-badge ' + statusTone(o.status)">{{ o.status }}</span>

src/app/credit-bureau/cic-alert-detail/cic-alert-detail.component.ts

@@ -52,6 +52,10 @@ export class CicAlertDetailComponent implements OnChanges {
   info: string | null = null;
   showRaw = false;
 
+  /** Alerts visited before the current one, so the user can go back after opening another enquiry of the customer. */
+  history: number[] = [];
+  private autoSeen = true;
+
   action: 'ACTIONED' | 'DISMISSED' | null = null;
   remarks = '';
 
@@ -59,9 +63,27 @@ export class CicAlertDetailComponent implements OnChanges {
   readonly statusTone = cicStatusTone;
 
   ngOnChanges(): void {
+    this.history = [];
+    this.autoSeen = true;
     if (this.alertId) this.load();
   }
 
+  openOther(id: number): void {
+    if (this.alertId) this.history.push(this.alertId);
+    this.alertId = id;
+    // Only the alert opened from the dashboard counts as "seen"; browsing the customer's other enquiries changes nothing.
+    this.autoSeen = false;
+    this.load();
+  }
+
+  back(): void {
+    const id = this.history.pop();
+    if (!id) return;
+    this.alertId = id;
+    this.autoSeen = false;
+    this.load();
+  }
+
   load(): void {
     if (!this.alertId) return;
     this.loading = true;
@@ -73,8 +95,9 @@ export class CicAlertDetailComponent implements OnChanges {
       next: (a) => {
         this.alert = a;
         this.loading = false;
+        setTimeout(() => document.querySelector('.cic-modal')?.scrollTo({ top: 0 }));
         // Opening a new alert is seeing it.
-        if (a.status === 'NEW' && a.clientId) this.setStatus('SEEN', null, true);
+        if (this.autoSeen && a.status === 'NEW' && a.clientId) this.setStatus('SEEN', null, true);
       },
       error: (e) => {
         this.loading = false;
@@ -139,6 +162,15 @@ export class CicAlertDetailComponent implements OnChanges {
       });
   }
 
+  /** All of the customer's enquiries, this one included, in a fixed order so the list does not reshuffle when one is opened. */
+  get customerEnquiries(): CicAlert[] {
+    if (!this.alert) return [];
+    return [
+      this.alert,
+      ...(this.alert.otherAlertsOfCustomer ?? [])
+    ].sort((x, y) => (y.enquiryDate ?? '').localeCompare(x.enquiryDate ?? '') || y.id - x.id);
+  }
+
   get exposure(): number {
     return (this.alert?.clientLoans ?? []).reduce((s, l) => s + Number(l.outstanding ?? 0), 0);
   }