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/cashier/clerk-ui-state.service.ts

@@ -0,0 +1,63 @@
+/**
+ * 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 { Injectable } from '@angular/core';
+import { BehaviorSubject } from 'rxjs';
+
+export interface ClerkSavedAccount {
+  accountDetails: any;
+  clientDetails: any;
+  kycDetails: any;
+  nominees: any[];
+  jointHolders: any[];
+  clientAddresses: any[];
+  nonPersonDetails: any;
+  clientPhotoUrl: string | null;
+  signatureUrl: string | null;
+  accountNotes: any[];
+  standingInstructions: any[];
+  todayTransactions: any[];
+  linkedAccounts: any;
+  sameDayNeftRtgs: number;
+  sameDayChequeClearing: number;
+  selectedRow: any;
+}
+
+export interface ClerkUiState {
+  accountLoaded: boolean;
+  facilities: { label: string; active: boolean }[];
+  savedRow: { acNo: string; acTyp: string } | null;
+  savedAccount: ClerkSavedAccount | null;
+}
+
+@Injectable({ providedIn: 'root' })
+export class ClerkUiStateService {
+  private readonly _state = new BehaviorSubject<ClerkUiState>({
+    accountLoaded: false,
+    facilities: [],
+    savedRow: null,
+    savedAccount: null
+  });
+  readonly state$ = this._state.asObservable();
+
+  get snapshot(): ClerkUiState {
+    return this._state.value;
+  }
+
+  setFacilities(facilities: { label: string; active: boolean }[], acNo: string, acTyp: string): void {
+    this._state.next({ ...this._state.value, accountLoaded: true, facilities, savedRow: { acNo, acTyp } });
+  }
+
+  saveFullState(account: ClerkSavedAccount): void {
+    this._state.next({ ...this._state.value, savedAccount: account });
+  }
+
+  clear(): void {
+    this._state.next({ accountLoaded: false, facilities: [], savedRow: null, savedAccount: null });
+  }
+}