画布生成面板的引用 provider 按素材内容签名记忆

- ResourceCanvasAssetGenerationPanelView 的 referenceProviders 改依赖 assetsSignature(referenceAssets)：referenceAssets 由 .filter() 派生、每次渲染都是新数组，原来的 [referenceAssets] 依赖永远命中不了缓存
- 注释写明「provider 身份一变，输入区就重新注册 Lexical 更新监听」，避免以后又改回数组依赖

apps/ai-game-creator-shell/src/features/resource-canvas/ResourceCanvasAssetGenerationPanelView.tsx

@@ -35,6 +35,7 @@ import {
   type ResourceReferencePickerHandle,
 } from '../project-workspace/ResourceReferencePicker';
 import {
+  assetsSignature,
   type ChatComposerDraft,
   directCodexContentKey,
   directCodexContentToLegacyContentDto,
@@ -262,17 +263,21 @@ export function ResourceCanvasAssetGenerationPanelView({
   const referenceAssets = resourceCanvasAssetGenerationReferenceAssets(
     assets ?? [],
   );
+  const referenceAssetsSignature = assetsSignature(referenceAssets);
   /*
     引用来源：画布生成面板只注入资源与两个静默 provider——它把 `@` 引用当参考图用，
     而 `$` Skill 候选只有 DirectProject 回合那条路径会被解析成真 Skill，这里不注入。
-  */
+   */
   const referenceProviders = useMemo(
     () => [
       createResourceReferenceProvider({ assets: referenceAssets }),
       attachmentReferenceProvider,
       runtimeRegionReferenceProvider,
     ],
-    [referenceAssets],
+    // `referenceAssets` 每次渲染都是新数组（`.filter()` 派生），依赖它等于从不命中缓存：
+    // provider 身份一变，输入区就会重新注册 Lexical 更新监听。按内容签名取依赖才真的能跳过重建。
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+    [referenceAssetsSignature],
   );
   const promptInputRootRef = useRef<HTMLDivElement | null>(null);
   const referencePickerRef = useRef<ResourceReferencePickerHandle | null>(null);