feat(client): enforce immutability

apps/client/src/app/pages/accounts/transfer-balance/transfer-balance-dialog.component.ts

@@ -42,23 +42,14 @@ import {
   templateUrl: 'transfer-balance-dialog.html'
 })
 export class GfTransferBalanceDialogComponent {
-  protected accounts: Account[] = [];
-  protected currency: string;
-  protected transferBalanceForm: TransferBalanceForm;
+  protected readonly accounts: Account[] =
+    inject<TransferBalanceDialogParams>(MAT_DIALOG_DATA).accounts;
 
-  private readonly data = inject<TransferBalanceDialogParams>(MAT_DIALOG_DATA);
-  private readonly dialogRef =
-    inject<MatDialogRef<GfTransferBalanceDialogComponent>>(MatDialogRef);
-
-  public ngOnInit() {
-    this.accounts = this.data.accounts;
+  protected currency: string;
 
-    this.transferBalanceForm = new FormGroup(
+  protected readonly transferBalanceForm: TransferBalanceForm = new FormGroup(
     {
-        balance: new FormControl<number | string | null>(
-          '',
-          Validators.required
-        ),
+      balance: new FormControl<number | string | null>('', Validators.required),
       fromAccount: new FormControl<string | null>('', Validators.required),
       toAccount: new FormControl<string | null>('', Validators.required)
     },
@@ -67,6 +58,10 @@ export class GfTransferBalanceDialogComponent {
     }
   );
 
+  private readonly dialogRef =
+    inject<MatDialogRef<GfTransferBalanceDialogComponent>>(MatDialogRef);
+
+  public ngOnInit() {
     this.transferBalanceForm.controls.fromAccount.valueChanges.subscribe(
       (id) => {
         const currency = this.accounts.find((account) => {