test(web): add one-pass feature smoke plan and record blockers

web/app/src/engine-client/WebEngineClient.ts

@@ -245,6 +245,21 @@ export class WebEngineClient {
     return { status: result.status, snapshot: result.snapshot, geometryBuffers: [...this.geometryBuffers], nonMeshGeometryBuffers: [...this.nonMeshGeometryBuffers] };
   }
 
+  async importScene(format: string, fileName: string, mimeType: string, base64: string): Promise<BlendOpenResult & { delta: SceneDelta; importResult?: unknown }> {
+    const result = await this.request({ type: "jsonCommand", cmd: "importScene", params: { format, fileName, mimeType, base64 } });
+    if (!result.snapshot || !result.delta) throw this.report("INVALID_ARGUMENT", "IO 导入未返回场景结果", true);
+    this.geometryBuffers = result.geometryBuffers ?? this.geometryBuffers;
+    this.nonMeshGeometryBuffers = result.nonMeshGeometryBuffers ?? this.nonMeshGeometryBuffers;
+    return {
+      status: result.status,
+      snapshot: result.snapshot,
+      geometryBuffers: [...this.geometryBuffers],
+      nonMeshGeometryBuffers: [...this.nonMeshGeometryBuffers],
+      delta: result.delta,
+      importResult: result.json,
+    };
+  }
+
   async snapshot(): Promise<BlendOpenResult> {
     const result = await this.request({ type: "snapshot" });
     if (!result.snapshot) throw this.report("INVALID_ARGUMENT", "WebEngine 未返回 SceneIR", true);