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.scss

@@ -78,6 +78,53 @@
   }
 }
 
+/* ---------- Account-will-close notice ---------- */
+.swr-close-notice {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  margin: 4px 16px 16px;
+  padding: 10px 16px;
+  background: #fffbeb;
+  border: 1px solid #fde68a;
+  border-left: 3px solid #d97706;
+  border-radius: 8px;
+  font-size: 13px;
+  color: #92400e;
+
+  mat-icon {
+    color: #d97706;
+    flex-shrink: 0;
+  }
+
+  strong {
+    color: #7c2d12;
+  }
+}
+
+.swr-close-row td {
+  color: #92400e;
+}
+
+.swr-close-tag {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  margin-left: 8px;
+  padding: 2px 8px;
+  border-radius: 999px;
+  background: #fffbeb;
+  color: #d97706;
+  font-size: 11px;
+  font-weight: 700;
+
+  mat-icon {
+    font-size: 14px;
+    width: 14px;
+    height: 14px;
+  }
+}
+
 /* ---------- Verification trigger card ---------- */
 .swrv-trigger {
   display: flex;