fix(studio): 载入编排防御兜底，避免损坏图导致黑屏

点击「我的编排」里某条若其 graph 缺 position/type/data（旧数据/外部写入），
React Flow 缺 position 会直接崩成黑屏。loadGraph 改为对每个节点兜底：
补 type=typed、缺失或非法 position 给网格默认坐标、data.kind 不识别则回退 output、
补 label/config/status；边过滤掉两端不存在或缺 source/target 的，自动补 id。

验证(Preview)：故意存一条节点全缺字段的「损坏测试」→ 载入渲染为 2 节点·1 连线、
渲染器正常（不再黑屏）；正常「尽调问答 Agent」4 节点·3 连线照常载入。tsc+vite 通过；重建 .app。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

sundynix-desktop/frontend/src/studio/StudioView.tsx

@@ -106,12 +106,30 @@ export function StudioView({ onRun, phase, identity }: { onRun: (dsl: TaskDsl) =
   );
 
   const loadGraph = useCallback(
-    (g: { nodes: Node[]; edges: Edge[] }) => {
+    (g: { nodes?: Node[]; edges?: Edge[] }) => {
-      setNodes((g.nodes ?? []).map((n) => ({ ...n, data: { ...n.data, status: "idle" as NodeStatus } })));
+      // 防御：旧/损坏数据可能缺 position/type/data —— 全部兜底，避免 React Flow 崩成黑屏。
-      setEdges(g.edges ?? []);
+      const safeNodes: Node[] = (g.nodes ?? [])
+        .filter((n) => n && n.id)
+        .map((n, i) => {
+          const d = (n.data ?? {}) as { kind?: string; label?: string; config?: Record<string, unknown> };
+          const kind = d.kind && NODE_KINDS[d.kind] ? d.kind : "output";
+          const pos = n.position && typeof n.position.x === "number" && typeof n.position.y === "number" ? n.position : { x: 100 + (i % 4) * 220, y: 80 + Math.floor(i / 4) * 120 };
+          return {
+            id: n.id,
+            type: "typed",
+            position: pos,
+            data: { kind, label: d.label || NODE_KINDS[kind].label, config: d.config ?? {}, status: "idle" as NodeStatus },
+          };
+        });
+      const ids = new Set(safeNodes.map((n) => n.id));
+      const safeEdges: Edge[] = (g.edges ?? [])
+        .filter((e) => e && e.source && e.target && ids.has(e.source) && ids.has(e.target))
+        .map((e, i) => ({ ...e, id: e.id || `e${i}` }));
+      setNodes(safeNodes);
+      setEdges(safeEdges);
       setSelId(null);
       setIssues(null);
-      for (const n of g.nodes ?? []) {
+      for (const n of safeNodes) {
         const m = /^n(\d+)$/.exec(n.id);
         if (m) seq = Math.max(seq, Number(m[1]));
       }