Fix (beta): convert chat component to signal-backed (#13152)

src-ui/src/app/components/chat/chat/chat.component.html

@@ -6,7 +6,7 @@
   <div ngbDropdownMenu class="dropdown-menu-end shadow p-3" aria-labelledby="chatDropdown">
     <div class="chat-container bg-light p-2">
       <div class="chat-messages font-monospace small">
-        @for (message of messages; track message) {
+        @for (message of messages(); track message) {
           <div class="message d-flex flex-row small" [class.justify-content-end]="message.role === 'user'">
             <div class="p-2 m-2" [class.bg-body]="message.role === 'user'">
               <span>
@@ -36,11 +36,12 @@
             id="chatInput"
             class="form-control form-control-sm" name="chatInput" type="text"
             [placeholder]="placeholder"
-            [disabled]="loading"
-            [(ngModel)]="input"
+            [disabled]="loading()"
+            [ngModel]="input()"
+            (ngModelChange)="input.set($event)"
             (keydown)="searchInputKeyDown($event)"
             />
-          <button class="btn btn-sm btn-secondary" type="button" (click)="sendMessage()" [disabled]="loading">Send</button>
+          <button class="btn btn-sm btn-secondary" type="button" (click)="sendMessage()" [disabled]="loading()">Send</button>
         </div>
       </form>
     </div>