feat(cashier): denomination overdraft validation, exchange detail fix, cash exchange in reports

- Savings/Current/FD/RD withdrawal forms: card-style overdraft warning when
  requested denomination count exceeds cashier stock; submit blocked on overdraft
- Cash History detail view: show both RECEIVED and GIVEN denomination breakdowns
  for Cash Exchange (previously only RECEIVED side was displayed)
- Closing Cash Report: add Cash Exchanges section (denomination-wise received/given/net)
- Excess Transaction Report: include cash exchanges >= threshold with Type badge
  (Exchange/Txn) and ID Proof column for RBI/AML compliance
- cashier-shared.scss: etr-badge and closing-exchange-head styles
- Cash Exchange entry: overdraft warning redesigned to cx-overdraft-card BEM layout

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/cashier/excess-transaction-report/excess-transaction-report.component.html

@@ -36,26 +36,36 @@
     <table class="pg-table">
       <thead>
         <tr>
+          <th>Type</th>
           <th>Txn #</th>
           <th>Account No</th>
           <th>CIF</th>
           <th>Date</th>
           <th class="num">Amount</th>
+          <th>ID Proof</th>
         </tr>
       </thead>
       <tbody>
-        @for (r of rows; track r.txnId) {
+        @for (r of rows; track $index) {
           <tr>
+            <td>
+              @if (r.type === 'EXCHANGE') {
+                <span class="etr-badge etr-badge--exchange">Exchange</span>
+              } @else {
+                <span class="etr-badge etr-badge--savings">Txn</span>
+              }
+            </td>
             <td>{{ r.txnId }}</td>
             <td>{{ r.accountNo || '—' }}</td>
             <td>{{ r.cifNo || '—' }}</td>
             <td>{{ r.txnDate || '—' }}</td>
             <td class="num">₹{{ r.totalAmount | number: '1.2-2' }}</td>
+            <td>{{ r.idProof || '—' }}</td>
           </tr>
         }
         @if (loaded && rows.length === 0) {
           <tr>
-            <td colspan="5" class="pg-empty">No transactions at or above ₹{{ threshold | number }}.</td>
+            <td colspan="7" class="pg-empty">No transactions at or above ₹{{ threshold | number }}.</td>
           </tr>
         }
       </tbody>