复用资源引用的统一内容映射

让 Lexical 草稿读取复用 chatReferenceToContentPart，避免引用字段映射分叉。

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

@@ -80,6 +80,7 @@ import {
   type ChatComposerDraft,
   type ChatReference,
   chatReferenceListKey,
+  chatReferenceToContentPart,
   currentIterationVersionAssets,
   dedupeChatReferences,
   refreshResourceReference,
@@ -202,25 +203,7 @@ function collectDraftParts(
   if ($isResourceReferenceNode(node)) {
     textParts.push(`@${node.__reference.label}`);
     references.push(node.__reference);
-    content.push(
-      node.__reference.type === 'resource'
-        ? {
-            type: 'agc_resource_reference',
-            resourceId: node.__reference.resourceId,
-          }
-        : {
-            type: 'agc_runtime_region_reference',
-            label: node.__reference.label,
-            runId: node.__reference.runId,
-            versionId: node.__reference.versionId,
-            elementTag: node.__reference.elementTag,
-            elementRole: node.__reference.elementRole,
-            text: node.__reference.text,
-            width: node.__reference.width,
-            height: node.__reference.height,
-            resourceIds: node.__reference.resourceIds,
-          },
-    );
+    content.push(chatReferenceToContentPart(node.__reference));
     return;
   }
   if ($isElementNode(node)) {