修复了2个bug

lib/client/generation-result-sync.ts

@@ -28,14 +28,12 @@ async function fetchImageJob(jobId: string, signal: AbortSignal) {
 }
 
 async function fetchAssetsByID(ids: string[], signal: AbortSignal) {
-  const assets = await Promise.all(ids.map(async (id) => {
-    const response = await fetch(`/api/assets/${encodeURIComponent(id)}`, { cache: "no-store", signal });
-    const payload = await readJSON(response);
-    if (response.status === 404) return null;
-    if (!response.ok) throw new Error(payloadError(payload, "读取编辑结果素材失败"));
-    return isAsset(payload.asset) ? payload.asset : null;
-  }));
-  return assets.filter((asset): asset is Asset => Boolean(asset));
+  const response = await fetch("/api/assets", { cache: "no-store", signal });
+  const payload = await readJSON(response);
+  if (!response.ok) throw new Error(payloadError(payload, "读取编辑结果素材失败"));
+  const assets = Array.isArray(payload.assets) ? payload.assets.filter(isAsset) : [];
+  const assetsByID = new Map(assets.map((asset) => [asset.id, asset]));
+  return ids.map((id) => assetsByID.get(id)).filter((asset): asset is Asset => Boolean(asset));
 }
 
 function isAsset(value: unknown): value is Asset {

lib/seedream/layer-composition.ts

@@ -26,3 +26,16 @@ export type SeedreamLayerComposition = {
 };
 
 export type SeedreamLayerDraft = Pick<SeedreamLayerComposition, "baseAssetId" | "baseVisible" | "layers">;
+
+export function hasCompleteSeedreamLayerMetadata(records: unknown[], outputCount: number): boolean {
+  if (!Number.isInteger(outputCount) || outputCount < 2 || records.length !== outputCount) return false;
+  const indices = records.map((value) => {
+    if (!value || typeof value !== "object" || Array.isArray(value)) return undefined;
+    const raw = (value as Record<string, unknown>).z_index;
+    const index = typeof raw === "number" ? raw : typeof raw === "string" && raw.trim() ? Number(raw) : Number.NaN;
+    return Number.isInteger(index) && index >= 0 ? index : undefined;
+  });
+  if (indices.some((index) => index === undefined)) return false;
+  const numericIndices = indices as number[];
+  return numericIndices.includes(0) && new Set(numericIndices).size === numericIndices.length;
+}