Refactor mini-message system: add precomputed styles for optimization, update models and components to use preprocessed nodes, and display total message counts in ChatInfo UI.

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

@@ -2,4 +2,5 @@ export interface ChatChannel {
   name: string;
   type: 'SERVER' | 'DM' | 'PARTY' | 'GAC' | 'SPY';
   unreadMessages: number;
+  totalMessages: number;
 }

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

@@ -1,4 +1,4 @@
-import {MiniMessageComponent} from '@pages/altitude/chat/mini-message/mini-message.types';
+import {ProcessedMiniMessageNode} from '@pages/altitude/chat/mini-message/mini-message.types';
 
 export interface ChatMessage {
   uuid: string;
@@ -7,7 +7,7 @@ export interface ChatMessage {
   type: string;
   channel: string;
   receiver: string;
-  messageJson: MiniMessageComponent;
+  messageJson: ProcessedMiniMessageNode;
   notBlocked: boolean;
   channelName?: string;
   channelType?: 'SERVER' | 'DM' | 'PARTY' | 'GAC' | 'SPY';