fix(types): unblock CI typecheck on Dev

Two pre-existing tsgo failures surfaced by the loading-screen redesign PR:

1. AvatarEffectsView: import loadGamedata via the umbrella
   `@nitrots/nitro-renderer` instead of `@nitrots/utils`. The deep
   sub-package alias only exists in vite.config.mjs; tsgo resolves
   against node_modules, where only the umbrella is symlinked. Same
   symbol — index.ts re-exports `* from '@nitrots/utils'`.

2. DraggableWindow: `useRef<HTMLDivElement>()` -> `useRef<HTMLDivElement>(null)`.
   React 19 typings now require an initial value. Fixed once in
   a39aa37, re-introduced by the merge in 03bebe4.

src/common/draggable-window/DraggableWindow.tsx

@@ -30,7 +30,7 @@ export const DraggableWindow: FC<DraggableWindowProps> = props =>
     const [isDragging, setIsDragging] = useState(false);
     const [isPositioned, setIsPositioned] = useState(false);
     const [dragHandler, setDragHandler] = useState<HTMLElement>(null);
-    const elementRef = useRef<HTMLDivElement>();
+    const elementRef = useRef<HTMLDivElement>(null);
     const bringToTop = useCallback(() => {
         let zIndex = 400;
         for (const existingWindow of CURRENT_WINDOWS)

src/components/avatar-effects/AvatarEffectsView.tsx

@@ -1,5 +1,4 @@
-import { AddLinkEventTracker, AvatarDirectionAngle, AvatarEffectActivatedComposer, GetConfiguration, GetSessionDataManager, ILinkEventTracker, RemoveLinkEventTracker } from '@nitrots/nitro-renderer';
-import { loadGamedata } from '@nitrots/utils';
+import { AddLinkEventTracker, AvatarDirectionAngle, AvatarEffectActivatedComposer, GetConfiguration, GetSessionDataManager, ILinkEventTracker, loadGamedata, RemoveLinkEventTracker } from '@nitrots/nitro-renderer';
 import { ChangeEvent, FC, useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import { FaChevronLeft, FaChevronRight, FaSearch } from 'react-icons/fa';
 import { LocalizeText, SendMessageComposer } from '../../api';