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.ts

@@ -365,8 +365,8 @@ export class ShareWithdrawalRequestComponent implements OnInit {
           res?.settlementAmount != null
             ? `Share withdrawal approved. ₹${Number(res.settlementAmount).toLocaleString('en-IN', { minimumFractionDigits: 2 })} credited to the linked savings account.`
             : (res?.settlementWarning ?? 'Share withdrawal approved and processed.');
-        if (res?.autoClosureRequestId) {
-          message += ' All shares now withdrawn — a Share Closure Request was auto-submitted for manager review.';
+        if (res?.accountClosed) {
+          message += ' All shares withdrawn — the share account has been closed.';
         }
         this.snackBar.open(message, 'Close', { duration: 8000 });
         if (this.embedded) {