feat(clerk): add dedicated nav pages, state restore, and fullscreen ESC fix

- Add ClerkUiStateService with full account state save/restore (no double network call on back navigation)
- Add Photo & Signature, Standing Instructions, Today's Activity as dedicated nav pages
- Remove photo/signature, standing instructions, linked accounts, today's activity panels from main dashboard
- Add ESC key to exit fullscreen; clicking Clerk nav immediately restores fullscreen without re-navigating
- Compact clerk dashboard UI with reduced font sizes and padding throughout
- Add CashierOnlyGuard for route protection

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

src/app/clerk/clerk-dashboard/clerk-dashboard.component.ts

@@ -0,0 +1,18 @@
+/**
+ * Copyright since 2025 Mifos Initiative
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+import { Component } from '@angular/core';
+import { TransactionEntryComponent } from '../../cashier/transaction-entry/transaction-entry.component';
+
+@Component({
+  selector: 'mifosx-clerk-dashboard',
+  standalone: true,
+  imports: [TransactionEntryComponent],
+  template: `<mifosx-transaction-entry></mifosx-transaction-entry>`
+})
+export class ClerkDashboardComponent {}