feat(shares): close share account directly on withdrawal approval; drop separate closure-request flow

Replaces the auto-submit-closure-request behavior with an immediate
account close, in the same approval action, when a withdrawal brings
shares to zero — matching the backend's new single-step close-on-
approval flow. Removes the now-unneeded Share Closure Request feature
entirely: dedicated create/list components (Clerk Dashboard + Approval
Center), routes, nav links, and the "eligible for closure" banner on
the Share Account view.

Also adds a clear "this will close the account" notice wherever a
withdrawal would zero out the account's shares — the standalone Share
Withdrawal Request page (submit + review) and Transaction Entry's
Share Redemption Transfer confirm dialog — styled as an amber warning
callout rather than a plain info line. Trims that confirm dialog to
just the required details (dropped the redundant ECS A/C No. line and
the validation-checklist block) and compacts its overall size.

src/app/clerk/share-withdrawal-request/share-withdrawal-request.component.html

@@ -148,6 +148,16 @@
         </label>
       </div>
 
+      @if (account && remainingShares === 0) {
+        <div class="swr-close-notice">
+          <mat-icon>lock</mat-icon>
+          <span>
+            This withdraws <strong>all</strong> shares on this account. Approving it will
+            <strong>close the share account automatically</strong> — no separate closure step is needed.
+          </span>
+        </div>
+      }
+
       @if (!isReview) {
         <div class="inv-form-actions">
           <button
@@ -355,9 +365,14 @@
                 {{ requestedShares }} @ ₹{{ unitPrice | number: '1.2-2' }} = ₹{{ withdrawalValue | number: '1.2-2' }}
               </td>
             </tr>
-            <tr>
+            <tr [class.swr-close-row]="remainingShares === 0">
               <td>Remaining Shares After Withdrawal</td>
-              <td>{{ remainingShares }}</td>
+              <td>
+                {{ remainingShares }}
+                @if (remainingShares === 0) {
+                  <span class="swr-close-tag"><mat-icon>lock</mat-icon> Account will be closed on approval</span>
+                }
+              </td>
             </tr>
             <tr>
               <td>Requested Date</td>