Refactor ChatMessage model and components: rename messageJson to miniMessageNode for clarity and consistency.

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

@@ -5,7 +5,7 @@
         [{{ message.timestamp | date: 'mediumTime' }}]
       </span>
       @defer (on viewport; prefetch on idle) {
-        <mini-message [node]="message.messageJson"></mini-message>
+        <mini-message [node]="message.miniMessageNode"></mini-message>
       } @placeholder {
         <span>…</span>
       }

frontend/src/app/pages/altitude/chat/objects/chat-message.object.ts

@@ -7,7 +7,7 @@ export interface ChatMessage {
   type: string;
   channel: string;
   receiver: string;
-  messageJson: ProcessedMiniMessageNode;
+  miniMessageNode: ProcessedMiniMessageNode;
   notBlocked: boolean;
   channelName?: string;
   channelType?: 'SERVER' | 'DM' | 'PARTY' | 'GAC' | 'SPY';

frontend/src/app/pages/altitude/chat/service/chat.service.ts

@@ -88,7 +88,7 @@ export class ChatService implements OnDestroy {
     const messages: ChatMessage[] = raw.map((m) => {
       const message: ChatMessage = {
         ...m,
-        messageJson: precomputeNode(normalizeComponent(JSON.parse(m.messageJson))),
+        miniMessageNode: precomputeNode(normalizeComponent(JSON.parse(m.messageJson))),
       } as ChatMessage;
       const channelKey = this.getChannelKey(message);
       if (channelKey === null) {