fix(chequebook,ctsclearing): surface global stock allocation in UI; fix decided-state check

Receive Stock form now displays the actual highest-allocated serial across
every series (not just silently prefilling the field), so the operator
can see and trust the auto-suggested range start rather than taking it
on faith.

Fixes a real bug where item.decision (which InwardClearingItem.java always
sets to the literal string "PENDING" at creation, never null) was checked
with a plain truthy test everywhere a "has this been decided yet" branch
was needed. Since "PENDING" is a non-empty string, that check was always
true — silently breaking the Decide/View button label, the collapsed
validation summary, the "Awaiting settlement" text, and the decision
dialog itself (which never showed the actual Pass/Return form, even for
still-pending items). Replaced with a proper isDecided() check everywhere.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/chequebook/stock-management/stock-management.component.html

@@ -45,6 +45,12 @@
         @if (showReceiveForm) {
           <mat-card class="add-form">
             <mat-card-content>
+              <div class="global-allocation-note">
+                {{ 'labels.text.Highest leaf serial allocated so far, across every series' | translate }}:
+                <strong>{{ globalHighestAllocated }}</strong>
+                — {{ 'labels.text.next available start' | translate }}:
+                <strong>{{ globalHighestAllocated + 1 }}</strong>
+              </div>
               <form [formGroup]="receiveForm" (ngSubmit)="submitReceive()">
                 <div class="form-grid">
                   <mat-form-field appearance="fill">
@@ -82,7 +88,12 @@
                   <mat-form-field appearance="fill">
                     <mat-label>{{ 'labels.inputs.Range Start' | translate }}</mat-label>
                     <input matInput type="number" formControlName="rangeStart" required />
-                    <mat-hint>{{ 'labels.text.Auto-suggested to avoid overlap; editable' | translate }}</mat-hint>
+                    <mat-hint
+                      >{{ 'labels.text.Auto-suggested to avoid overlap across every series; editable' | translate }} ({{
+                        globalHighestAllocated
+                      }}
+                      + 1)</mat-hint
+                    >
                   </mat-form-field>
                   <mat-form-field appearance="fill">
                     <mat-label>{{ 'labels.inputs.Range End' | translate }}</mat-label>