fix(snapshots): re-apply the 3 snapshot-consumer migrations with the use-between/useSyncExternalStore incompatibility resolved

Root cause of last session's "(intermediate value)() is undefined" at
ToolbarView.tsx:46:

  use-between 1.x ships its own React-dispatcher proxy (ownDispatcher
  in node_modules/use-between/release/index.esm.js:54-169) that
  re-implements only useState, useReducer, useEffect, useLayoutEffect,
  useCallback, useMemo, useRef and useImperativeHandle. It does NOT
  implement useSyncExternalStore. When the inner state function of
  useBetween(stateFn) calls useSyncExternalStore (directly or via
  useExternalSnapshot / useUserDataSnapshot), React resolves the
  dispatcher to use-between's proxy, finds .useSyncExternalStore
  missing, and calls undefined() — that's the exact production crash
  in Firefox. Chrome reports the same as
  "dispatcher.useSyncExternalStore is not a function".

Neither the vite alias (790ad2b) nor the defensive renderer-method
guards (c35a2d4) could fix it — both addressed downstream symptoms
(stale dist / missing manager methods) but the dispatcher is upstream
of both. That's why every retry kept reproducing the same error.

Fix is structural: snapshot hooks (useUserDataSnapshot,
useIsUserIgnored, etc.) MUST run outside any useBetween scope. Three
re-applied migrations:

- useSessionInfo: snapshot read moved into the outer wrapper. The
  inner useSessionInfoState (useBetween-shared) now contains only
  use-between-safe hooks: useState, useMessageEvent, plain actions.
  userFigure / userRespectRemaining / petRespectRemaining come from
  useUserDataSnapshot() OUTSIDE useBetween, so useSyncExternalStore
  installs against the real React dispatcher.

- useChatWidget.ownUserId: direct snapshot read. useChatWidget is
  exported as `useChatWidget = useChatWidgetState` (NOT wrapped in
  useBetween), so this hook never sat inside the broken scope — the
  precautionary rollback was unnecessary in retrospect. Gains
  session-change reactivity (e.g. reconnect under a different user id).

- AvatarInfoWidgetAvatarView Ignore/Unignore: useIsUserIgnored(name)
  read directly in the component body. Same reasoning as
  useChatWidget — never inside useBetween. The menu auto-flips
  Ignore <-> Unignore while the popup is open.

Added regression guard at src/hooks/session/useSessionSnapshots.test.tsx
with two cases: (1) useSyncExternalStore inside useBetween throws,
(2) useSyncExternalStore outside useBetween in the same render works.
Pins the constraint so future migrations cannot reintroduce the bad
shape silently.

Verification: yarn typecheck clean, yarn test 209/209 (207 baseline
+ 2 new regression cases), no consumer surface changes — every
destructured field (userFigure, userRespectRemaining, respectUser,
petRespectRemaining, respectPet, chatStyleId, updateChatStyleId) is
still returned with the same name and shape.

src/hooks/rooms/widgets/useChatWidget.ts

@@ -2,6 +2,7 @@ import { GetGuestRoomResultEvent, GetRoomEngine, GetSessionDataManager, PetFigur
 import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import { ChatBubbleMessage, ChatBubbleUtilities, ChatEntryType, ChatHistoryCurrentDate, GetConfigurationValue, GetRoomObjectScreenLocation, IRoomChatSettings, LocalizeText, PlaySound, RoomChatFormatter } from '../../../api';
 import { useMessageEvent, useNitroEvent } from '../../events';
+import { useUserDataSnapshot } from '../../session/useSessionSnapshots';
 import { useTranslation } from '../../translation';
 import { useRoom } from '../useRoom';
 import { useChatHistory } from './../../chat-history';
@@ -22,7 +23,12 @@ const useChatWidgetState = () =>
     const { addChatEntry, updateChatEntry } = useChatHistory();
     const { settings, translateIncoming, consumeOutgoingTranslation } = useTranslation();
     const isDisposed = useRef(false);
-    const ownUserId = (GetSessionDataManager()?.userId || -1);
+    // Reactive: re-renders if the session-data snapshot flips (e.g.
+    // reconnect under a different user id). Safe to call here —
+    // useChatWidget is NOT wrapped in useBetween (see export below),
+    // so the real React dispatcher is in scope and
+    // useSyncExternalStore installs correctly.
+    const ownUserId = (useUserDataSnapshot().userId || -1);
 
     const applyTranslationToBubble = useCallback((chatMessage: ChatBubbleMessage, originalText: string, translatedText: string, detectedLanguage: string, targetLanguage: string) =>
     {