Upgrading to Angular 20:

Replaced checked in package-lock.json by regenerated one.
Ran ng update @angular/core@20 @angular/cli@20
Ran npm install @angular-builders/jest@^20.0.0 @fortawesome/angular-fontawesome@^3.0.0 @swimlane/ngx-graph@^11
Ran npm install ngx-mat-select-search@^8.0.2.
Ran ng update @angular/material@20.
Updated all eslint and typescript to the latest versions.
Removed @angular-devkit/schematics.
Updated fontawesome.
Updated rxjs and tslib.
Moved required node version from 16 to 20.
Updated jest-preset-angular.
Set preserveWhitespaces to false.
Corrected two type declarations in two typescript files to make ng serve run without errors.
Removed unused angular-devkit/schematics from view-user.component.ts .
Updated list of supported browsers.
Upgraded prettier.
Ran prettier . --write the first time.
Ran prettier . --write the second time.
Ran ng generate @angular/core:inject with defaults, excepted a handful of files.
Fixed remaining eslint problems.
Added dist directory to ignores in eslint.config.js.
Let prettier fix formatting, almost everything is just line breaks.
Made htmlhint ignore @if and @for Angular constructs.
Updated node version in Github workflow to 22.12.0 (build.yml).
Updated .env.ts.
Updated Angular datetime format strings from YYYY-MM-DD to yyyy-MM-dd.
Merged changes from dev into angular20 branch.

src/app/clients/clients.component.html

@@ -10,11 +10,13 @@
         />
       </mat-form-field>
     </div>
-    <div class="filter-box" *ngIf="existsClientsToFilter">
-      <mat-checkbox #showClosedAccounts labelPosition="after" class="m-r-10"
-        >{{ 'labels.inputs.Show Closed Accounts' | translate }}
-      </mat-checkbox>
-    </div>
+    @if (existsClientsToFilter) {
+      <div class="filter-box">
+        <mat-checkbox #showClosedAccounts labelPosition="after" class="m-r-10"
+          >{{ 'labels.inputs.Show Closed Accounts' | translate }}
+        </mat-checkbox>
+      </div>
+    }
     <div class="action-button gap-25px">
       <button
         mat-raised-button
@@ -31,9 +33,11 @@
   </div>
 
   <div [hidden]="!existsClientsToFilter" class="client-list">
-    <div *ngIf="isLoading">
-      <mat-progress-bar mode="indeterminate"></mat-progress-bar>
-    </div>
+    @if (isLoading) {
+      <div>
+        <mat-progress-bar mode="indeterminate"></mat-progress-bar>
+      </div>
+    }
     <table mat-table [dataSource]="dataSource" matSort (matSortChange)="sortChanged($event)" class="bordered-table">
       <!-- Name Column -->
       <ng-container matColumnDef="displayName">