Pilot: move InfoStand event listeners to useAvatarInfoWidget owner

InfoStandWidgetUserView previously subscribed to three room-session
events (RSUBE_BADGES, USER_FIGURE, FAVOURITE_GROUP_UPDATE) and pushed
the result back to its parent via a setAvatarInfo prop, with each
handler running CloneObject(prev) before patching one field. Three
issues with that shape:

- CloneObject was deep-cloning the whole AvatarInfoUser shape blindly
  with no class-prototype awareness;
- the three listeners raced on shallow merges across the same prev
  reference in StrictMode dev;
- the subscriptions lived outside the state owner, forcing a prop
  callback barrier per event.

The subscriptions are now in useAvatarInfoWidget — the actual owner of
avatarInfo — and call three pure reducers extracted to
src/hooks/rooms/widgets/avatarInfo.reducers.ts (applyUserBadgesUpdate,
applyUserFigureUpdate, applyFavouriteGroupUpdate). Each reducer returns
the same reference when the event doesn't apply so React bail-outs work.
The clone now constructs a fresh AvatarInfoUser preserving prototype.

dedupeBadges is extracted to its own pure module under src/api/avatar/
so Vitest can cover it without pulling in the renderer.

InfoStandWidgetUserView loses the setAvatarInfo prop (parent updated)
and the CloneObject import.

src/api/avatar/dedupeBadges.ts

@@ -0,0 +1,21 @@
+/**
+ * Strips duplicate badge codes from a server-supplied badge array,
+ * preserving slot indices: a duplicate is replaced by an empty string
+ * rather than shifted out, so badge[i] still corresponds to slot i.
+ *
+ * Empty / falsy entries are normalized to '' (some servers emit null
+ * inside the array for unused slots).
+ */
+export const dedupeBadges = (badges: ReadonlyArray<string>): string[] =>
+{
+    const seen = new Set<string>();
+
+    return badges.map(code =>
+    {
+        if(!code || seen.has(code)) return '';
+
+        seen.add(code);
+
+        return code;
+    });
+};

src/api/avatar/index.ts

@@ -3,5 +3,6 @@ export * from './AvatarEditorColorSorter';
 export * from './AvatarEditorPartSorter';
 export * from './AvatarEditorThumbnailsHelper';
 export * from './BuildPurchasableClothingFigure';
+export * from './dedupeBadges';
 export * from './IAvatarEditorCategory';
 export * from './IAvatarEditorCategoryPartItem';