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/cash-history/cash-history.component.html

@@ -11,25 +11,11 @@
     <div>
       <div class="pg-eyebrow">CASHIER · HISTORY</div>
       <h1 class="pg-title">Cash Movement History</h1>
-      <p class="pg-sub">All transfers, settlements, and inter-cashier movements. Reverse any active transaction.</p>
+      <p class="pg-sub">All transfers, settlements, inter-cashier movements and cash exchanges.</p>
     </div>
     <button type="button" class="pg-btn pg-btn--ghost" (click)="load()"><mat-icon>refresh</mat-icon> Refresh</button>
   </header>
 
-  <!-- Reversal confirm panel -->
-  @if (reversingId !== null) {
-    <div class="reverse-panel">
-      <mat-icon class="reverse-icon">warning</mat-icon>
-      <span
-        >Reverse <strong>#{{ reversingId }}</strong
-        >? This cannot be undone.</span
-      >
-      <input class="reverse-reason" type="text" [(ngModel)]="reverseReason" placeholder="Reason (optional)" />
-      <button type="button" class="pg-btn pg-btn--danger" (click)="confirmReverse()">Confirm Reversal</button>
-      <button type="button" class="pg-btn pg-btn--ghost" (click)="cancelReverse()">Cancel</button>
-    </div>
-  }
-
   @if (loading) {
     <div class="pg-empty">Loading…</div>
   }
@@ -134,11 +120,6 @@
                   >
                     <mat-icon>visibility</mat-icon>
                   </button>
-                  @if (!r.isReversed) {
-                    <button type="button" class="pg-btn pg-btn--ghost btn-sm" title="Reverse" (click)="startReverse(r)">
-                      <mat-icon>undo</mat-icon>
-                    </button>
-                  }
                 </div>
               </td>
             </tr>
@@ -187,6 +168,12 @@
           <span class="detail-meta__label">Date</span>
           <span class="detail-meta__val">{{ detail.row.date }}</span>
         </div>
+        @if (detail.row.type === 'exchange') {
+          <div class="detail-meta__item">
+            <span class="detail-meta__label">Customer PAN</span>
+            <span class="detail-meta__val">{{ detail.row.panNumber || '—' }}</span>
+          </div>
+        }
         <div class="detail-meta__item">
           <span class="detail-meta__label">Total Amount</span>
           <span class="detail-meta__val detail-meta__val--amount">₹{{ detail.row.amount | number: '1.2-2' }}</span>