拆出引用草稿键与 token 的取值 helper 消除嵌套三元

- apps/ai-game-creator-shell/src/features/project-workspace/ResourceReferenceInput.tsx 新增 referenceDraftKey/referenceDraftToken，替换 readDraftFromNodes 里构造 labels 时的嵌套三元表达式
- 行为与原先一致，只是把「resource 取 id、skill 取 name、其余取 label」的规则收敛到一处

apps/ai-game-creator-shell/src/features/project-workspace/ResourceReferenceInput.tsx

@@ -240,6 +240,20 @@ type DraftProjection = {
   content: DirectCodexUserContentPart[];
 };
 
+/** 引用在草稿文本里的稳定键：resource 用资源 id，skill 用技能名，其余用显示名。 */
+function referenceDraftKey(reference: ChatReference) {
+  if (reference.type === 'resource') return reference.resourceId;
+  if (reference.type === 'skill') return reference.name;
+  return reference.label;
+}
+
+/** 引用回读成草稿文本时的 token：skill 是 `$name`，resource 与 runtime region 是 `@显示名`。 */
+function referenceDraftToken(reference: ChatReference) {
+  return reference.type === 'skill'
+    ? `$${reference.name}`
+    : `@${reference.label}`;
+}
+
 /** 仅供编辑器内部派生引用（重建文本草稿时用）；对外只暴露 canonical content。 */
 function readDraftProjectionFromNodes(): DraftProjection {
   const references: ChatReference[] = [];
@@ -256,12 +270,8 @@ function readDraftFromNodes(): ChatComposerDraft {
   const projection = readDraftProjectionFromNodes();
   const labels = new Map(
     projection.references.map((reference) => [
-      reference.type === 'resource'
-        ? reference.resourceId
-        : reference.type === 'skill'
-          ? reference.name
-          : reference.label,
-      reference.type === 'skill' ? `$${reference.name}` : `@${reference.label}`,
+      referenceDraftKey(reference),
+      referenceDraftToken(reference),
     ]),
   );
   const text = projection.content