feat(cashier): cashier-only cash operations, exchange PAN/denomination checks and Branch Cash Position

- Cash Exchange Entry: customer details with PAN (mandatory above Rs 50,000), cashier card,
  denomination-wise validation against the master and real-time impact preview.
- Inter-Cashier Transfer: sender fixed to the logged-in cashier, both sides' details and
  denomination holdings shown, blocked until both are allocated cash.
- Reconciliation, exchange and inter-cashier operate on the logged-in cashier only.
- New Branch Cash Position screen (vault + cashier drawers, denomination-wise).
- Customer search dialog shows the KYC PAN.
- Cashier menu cleanup: Excess/Closing report and Exchange Detail removed, nav compacted to one row.
- Reverse actions removed from cash transfer, settlement, exchange and inter-cashier.

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

src/app/cashier/reconciliation/reconciliation.component.html

@@ -19,34 +19,21 @@
     <!-- ── Entry Tab ── -->
     <mat-tab label="New Reconciliation">
       <div class="pg-tab-body">
+        @if (ownCashierMissing) {
+          <div class="pg-empty">
+            Your login is not linked to a cashier, so there is no cash drawer to reconcile. Ask an administrator to link
+            your user to a cashier.
+          </div>
+        }
         <div class="pg-toolbar pg-toolbar--mat">
-          @if (tellers.length === 1) {
-            <mat-form-field appearance="outline" subscriptSizing="dynamic">
-              <mat-label>Teller</mat-label>
-              <input matInput type="text" [value]="tellers[0].name" readonly />
-            </mat-form-field>
-          } @else {
-            <mat-form-field appearance="outline" subscriptSizing="dynamic">
-              <mat-label>Teller</mat-label>
-              <mat-select [value]="selectedTellerId" (selectionChange)="onTellerSelect($event.value)">
-                @for (t of tellers; track t.id) {
-                  <mat-option [value]="t.id">{{ t.name }}</mat-option>
-                }
-              </mat-select>
-            </mat-form-field>
-          }
-
+          <!-- A reconciliation is the cashier's own count of their own drawer: nothing to pick. -->
           <mat-form-field appearance="outline" subscriptSizing="dynamic">
-            <mat-label>Cashier</mat-label>
-            <mat-select
-              [value]="selectedCashierId"
-              (selectionChange)="onCashierSelect($event.value)"
-              [disabled]="!selectedTellerId"
-            >
-              @for (c of cashiers; track c.id) {
-                <mat-option [value]="c.id">{{ c.label }}</mat-option>
-              }
-            </mat-select>
+            <mat-label>Teller</mat-label>
+            <input matInput type="text" [value]="ownTellerName || '—'" readonly />
+          </mat-form-field>
+          <mat-form-field appearance="outline" subscriptSizing="dynamic">
+            <mat-label>Cashier (You)</mat-label>
+            <input matInput type="text" [value]="cashierName || '—'" readonly />
           </mat-form-field>
 
           <mat-form-field appearance="outline" subscriptSizing="dynamic">