feat(ui): remove Undo / Revert transaction actions

Removes the Undo button and Undo menu item from savings, current, fixed deposit, recurring deposit
and loan transactions, the account-transfer Undo, and the Revert Transaction button on the
journal entry transaction detail, to prevent accidental reversal of posted entries.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/app/loans/loans-view/transactions-tab/transactions-tab.component.html

@@ -177,10 +177,6 @@
           }
           @if (allowUndoTransaction(transaction)) {
             <span>
-              <button mat-menu-item *mifosxHasPermission="'ADJUST_LOAN'" (click)="undoTransaction(transaction, $event)">
-                <mat-icon><fa-icon icon="undo" size="sm"></fa-icon></mat-icon>
-                <span>{{ 'tooltips.Undo Transaction' | translate }}</span>
-              </button>
               <button
                 mat-menu-item
                 class="account-action-button"

src/app/loans/loans-view/transactions/view-transaction/view-transaction.component.html

@@ -12,9 +12,6 @@
       <button mat-raised-button color="primary" [routerLink]="'edit'" [disabled]="!allowEdition">
         <fa-icon icon="edit" class="m-r-10"></fa-icon>{{ 'Edit' | translate }}
       </button>
-      <button mat-raised-button color="warn" (click)="undoTransaction()" [disabled]="!allowUndo">
-        <fa-icon icon="undo" class="m-r-10"></fa-icon>{{ 'Undo' | translate }}
-      </button>
     </span>
     <span *mifosxHasPermission="'CHARGEBACK_LOAN'">
       <button mat-raised-button color="warn" [disabled]="!allowChargeback" (click)="chargebackTransaction()">