feat(events,session): add React-friendly subscribe APIs and snapshot getters

Adds backwards-compatible primitives needed to consume the renderer from
React 19 hooks (useSyncExternalStore, use(), TanStack Query) without
re-architecting the event bus.

- EventDispatcher.subscribe(type, cb): () => void — unsubscriber-returning
  wrapper matching the useSyncExternalStore subscribe signature.
- CommunicationManager.subscribeMessage(eventCtor, handler): () => void —
  packet-stream equivalent.
- SessionDataManager.getUserDataSnapshot() and
  RoomSessionManager.getActiveRoomSessionSnapshot() — referentially-stable
  read-only views invalidated through new SESSION_DATA_UPDATED and
  ROOM_SESSION_UPDATED events.

All additive; existing addEventListener/removeEventListener / IRoomSession
APIs are unchanged. Bumps renderer to 2.1.0.

packages/session/src/SessionDataManager.ts

@@ -1,8 +1,8 @@
-import { IFurnitureData, IGroupInformationManager, IMessageComposer, IMessageEvent, IProductData, ISessionDataManager, NoobnessLevelEnum, SecurityLevel } from '@nitrots/api';
+import { IFurnitureData, IGroupInformationManager, IMessageComposer, IMessageEvent, IProductData, ISessionDataManager, IUserDataSnapshot, NoobnessLevelEnum, SecurityLevel } from '@nitrots/api';
 import { AccountSafetyLockStatusChangeMessageEvent, AccountSafetyLockStatusChangeParser, AvailabilityStatusMessageEvent, ChangeUserNameResultMessageEvent, EmailStatusResultEvent, FigureUpdateEvent, GetCommunication, GetUserTagsComposer, InClientLinkEvent, MysteryBoxKeysEvent, NoobnessLevelMessageEvent, PetRespectComposer, PetScratchFailedMessageEvent, RoomReadyMessageEvent, RoomUnitChatComposer, UserInfoEvent, UserNameChangeMessageEvent, UserPermissionsEvent, UserRespectComposer, UserTagsMessageEvent } from '@nitrots/communication';
 import { GetConfiguration } from '@nitrots/configuration';
 import { GetLocalizationManager } from '@nitrots/localization';
-import { GetEventDispatcher, MysteryBoxKeysUpdateEvent, NitroSettingsEvent, SessionDataPreferencesEvent, UserNameUpdateEvent } from '@nitrots/events';
+import { GetEventDispatcher, MysteryBoxKeysUpdateEvent, NitroEvent, NitroEventType, NitroSettingsEvent, SessionDataPreferencesEvent, UserNameUpdateEvent } from '@nitrots/events';
 import { CreateLinkEvent, HabboWebTools } from '@nitrots/utils';
 import { Texture } from 'pixi.js';
 import { GroupInformationManager } from './GroupInformationManager';
@@ -52,11 +52,49 @@ export class SessionDataManager implements ISessionDataManager
 
     private _badgeImageManager: BadgeImageManager = new BadgeImageManager();
 
+    private _userDataSnapshot: Readonly<IUserDataSnapshot> | null = null;
+
     constructor()
     {
         this.resetUserInfo();
     }
 
+    private invalidateUserDataSnapshot(): void
+    {
+        this._userDataSnapshot = null;
+
+        GetEventDispatcher().dispatchEvent(new NitroEvent(NitroEventType.SESSION_DATA_UPDATED));
+    }
+
+    public getUserDataSnapshot(): Readonly<IUserDataSnapshot>
+    {
+        if(this._userDataSnapshot) return this._userDataSnapshot;
+
+        this._userDataSnapshot = Object.freeze<IUserDataSnapshot>({
+            userId: this._userId,
+            userName: this._name,
+            figure: this._figure,
+            gender: this._gender,
+            realName: this._realName,
+            respectsReceived: this._respectsReceived,
+            respectsLeft: this._respectsLeft,
+            respectsPetLeft: this._respectsPetLeft,
+            canChangeName: this._canChangeName,
+            clubLevel: this._clubLevel,
+            securityLevel: this._securityLevel,
+            isAmbassador: this._isAmbassador,
+            isEmailVerified: this._isEmailVerified,
+            isNoob: (this._noobnessLevel !== NoobnessLevelEnum.OLD_IDENTITY),
+            isAuthenticHabbo: this._isAuthenticHabbo,
+            isSystemOpen: this._systemOpen,
+            isSystemShutdown: this._systemShutdown,
+            uiFlags: this._uiFlags,
+            tags: Object.freeze<string[]>([...this._tags]) as ReadonlyArray<string>
+        });
+
+        return this._userDataSnapshot;
+    }
+
     public async init(): Promise<void>
     {
         await Promise.all([
@@ -75,6 +113,8 @@ export class SessionDataManager implements ISessionDataManager
                 this._gender = event.getParser().gender;
 
                 HabboWebTools.updateFigure(this._figure);
+
+                this.invalidateUserDataSnapshot();
             })),
             GetCommunication().registerMessageEvent(new UserInfoEvent(this.onUserInfoEvent.bind(this))),
             GetCommunication().registerMessageEvent(new UserPermissionsEvent(this.onUserPermissionsEvent.bind(this))),
@@ -98,6 +138,8 @@ export class SessionDataManager implements ISessionDataManager
             this._uiFlags = event.flags;
 
             GetEventDispatcher().dispatchEvent(new SessionDataPreferencesEvent(this._uiFlags));
+
+            this.invalidateUserDataSnapshot();
         };
 
         GetEventDispatcher().addEventListener<NitroSettingsEvent>(NitroSettingsEvent.SETTINGS_UPDATED, this._settingsEventCallback);
@@ -189,6 +231,8 @@ export class SessionDataManager implements ISessionDataManager
         this._safetyLocked = userInfo.safetyLocked;
 
         this._ignoredUsersManager.requestIgnoredUsers(userInfo.username);
+
+        this.invalidateUserDataSnapshot();
     }
 
     private onUserPermissionsEvent(event: UserPermissionsEvent): void
@@ -198,6 +242,8 @@ export class SessionDataManager implements ISessionDataManager
         this._clubLevel = event.getParser().clubLevel;
         this._securityLevel = event.getParser().securityLevel;
         this._isAmbassador = event.getParser().isAmbassador;
+
+        this.invalidateUserDataSnapshot();
     }
 
     private onAvailabilityStatusMessageEvent(event: AvailabilityStatusMessageEvent): void
@@ -211,6 +257,8 @@ export class SessionDataManager implements ISessionDataManager
         this._systemOpen = parser.isOpen;
         this._systemShutdown = parser.onShutdown;
         this._isAuthenticHabbo = parser.isAuthenticUser;
+
+        this.invalidateUserDataSnapshot();
     }
 
     private onPetRespectFailed(event: PetScratchFailedMessageEvent): void
@@ -218,6 +266,8 @@ export class SessionDataManager implements ISessionDataManager
         if(!event || !event.connection) return;
 
         this._respectsPetLeft++;
+
+        this.invalidateUserDataSnapshot();
     }
 
     private onChangeNameUpdateEvent(event: ChangeUserNameResultMessageEvent): void
@@ -233,6 +283,8 @@ export class SessionDataManager implements ISessionDataManager
         this._canChangeName = false;
 
         GetEventDispatcher().dispatchEvent(new UserNameUpdateEvent(parser.name));
+
+        this.invalidateUserDataSnapshot();
     }
 
     private onUserNameChangeMessageEvent(event: UserNameChangeMessageEvent): void
@@ -249,6 +301,8 @@ export class SessionDataManager implements ISessionDataManager
         this._canChangeName = false;
 
         GetEventDispatcher().dispatchEvent(new UserNameUpdateEvent(this._name));
+
+        this.invalidateUserDataSnapshot();
     }
 
     private onUserTags(event: UserTagsMessageEvent): void
@@ -260,6 +314,8 @@ export class SessionDataManager implements ISessionDataManager
         if(!parser) return;
 
         this._tags = parser.tags;
+
+        this.invalidateUserDataSnapshot();
     }
 
     private onRoomModelNameEvent(event: RoomReadyMessageEvent): void
@@ -300,6 +356,8 @@ export class SessionDataManager implements ISessionDataManager
         this._noobnessLevel = event.getParser().noobnessLevel;
 
         if(this._noobnessLevel !== NoobnessLevelEnum.OLD_IDENTITY) GetConfiguration().setValue<number>('new.identity', 1);
+
+        this.invalidateUserDataSnapshot();
     }
 
     private onAccountSafetyLockStatusChangeMessageEvent(event: AccountSafetyLockStatusChangeMessageEvent): void
@@ -316,6 +374,8 @@ export class SessionDataManager implements ISessionDataManager
     private onEmailStatus(event: EmailStatusResultEvent): void
     {
         this._isEmailVerified = event?.getParser()?.isVerified ?? false;
+
+        this.invalidateUserDataSnapshot();
     }
 
     public getFloorItemData(id: number): IFurnitureData
@@ -476,6 +536,8 @@ export class SessionDataManager implements ISessionDataManager
         this.send(new UserRespectComposer(userId));
 
         this._respectsLeft--;
+
+        this.invalidateUserDataSnapshot();
     }
 
     public givePetRespect(petId: number): void
@@ -485,6 +547,8 @@ export class SessionDataManager implements ISessionDataManager
         this.send(new PetRespectComposer(petId));
 
         this._respectsPetLeft--;
+
+        this.invalidateUserDataSnapshot();
     }
 
     public sendSpecialCommandMessage(text: string, styleId: number = 0): void