Enforce 256-character limit on chat messages with validation in ChatBoxComponent and schema updates.

frontend/src/app/pages/altitude/chat/components/chat/chat-box.component.html

@@ -20,6 +20,7 @@
       [(ngModel)]="chatText"
       (keyup.enter)="sendMessage()"
       placeholder="Type a message..."
+      maxlength="256"
     />
     <button (click)="sendMessage()">Send</button>
   </div>

frontend/src/app/pages/altitude/chat/components/chat/chat-box.component.ts

@@ -39,7 +39,15 @@ export class ChatBoxComponent {
 
   sendMessage() {
     const message = this.chatText.trim();
-    if (!message) return;
+    if (!message) {
+      return;
+    }
+    if (message.length > 256) {
+      this.matSnackBar.open('Message too long, it can only be 256 characters', 'Dismiss', {
+        duration: 3000
+      });
+      return;
+    }
 
     const selectedChannel = this.chatService.selectedChannel();
     const uuid = this.authService.getUuid();

open_api/src/main/resources/schemas/server-message/server-message.yml

@@ -42,3 +42,4 @@ components:
         message:
           type: string
           description: The message to send
+          maxLength: 256