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/cashier/cashier-routing.module.ts

@@ -78,22 +78,6 @@ const routes: Routes = [
             ),
           data: { title: 'My Share Requests', breadcrumb: 'My Share Requests' }
         },
-        {
-          path: 'share-closure-request',
-          loadComponent: () =>
-            import('../clerk/share-closure-request/share-closure-request.component').then(
-              (m) => m.ShareClosureRequestComponent
-            ),
-          data: { title: 'New Share Closure Request', breadcrumb: 'New Share Closure Request', mode: 'create' }
-        },
-        {
-          path: 'share-closure-requests',
-          loadComponent: () =>
-            import('../clerk/my-share-closure-requests/my-share-closure-requests.component').then(
-              (m) => m.MyShareClosureRequestsComponent
-            ),
-          data: { title: 'My Share Closure Requests', breadcrumb: 'My Share Closure Requests' }
-        },
         {
           path: 'account-facilities',
           loadComponent: () =>