fix: 根治保存必弹磁盘冲突——编辑不再污染乐观锁基准

- editorStore 新增 baseUpdatedAt（磁盘基准版本），仅 loadFlow/syncSavedFlow 更新
- 保存 expectedUpdatedAt 改用 baseUpdatedAt；此前用每次编辑都会拨快的
  flow.meta.updatedAt 做比对，导致任何编辑后首次保存必然误判冲突
- 移除 flows:save/get 诊断日志（保留内容一致放行逻辑）

src/main/index.ts

@@ -127,7 +127,9 @@ function registerIpc(): void {
     for (const flow of createExampleFlows(url)) saveFlow(flow);
     return listFlows();
   });
-  ipcMain.handle("flows:get", (_event, id: string) => getFlow(id));
+  ipcMain.handle("flows:get", (_event, id: string) => {
+    return getFlow(id);
+  });
   ipcMain.handle("flows:save", (_event, flow: FlowDefinition, opts?: FlowSaveOptions): FlowSaveResult => {
     if (!opts?.force && opts?.expectedUpdatedAt) {
       let disk: FlowDefinition | null = null;

src/renderer/src/pages/EditorPage.tsx

@@ -65,7 +65,9 @@ export function EditorPage({ catalog, onToast, onBack }: EditorPageProps) {
     setSaving(true);
     try {
       const result = await window.rpa.flows.save(current, {
-        expectedUpdatedAt: current.meta?.updatedAt || undefined
+        // 用「磁盘基准版本」做乐观锁，不能用 current.meta.updatedAt——
+        // 每次本地编辑都会拨快它，会导致每次保存都误判磁盘冲突
+        expectedUpdatedAt: useEditorStore.getState().baseUpdatedAt || undefined
       });
       if (result.conflict) {
         if (opts?.interactive) {

src/renderer/src/store/editorStore.ts

@@ -57,6 +57,10 @@ function uniqueOutputVar(base: string, nodes: FlowNode[]): string {
 
 interface EditorState {
   flow: FlowDefinition | null;
+  /** 乐观锁基准：最近一次从磁盘加载/保存成功返回的 meta.updatedAt。
+   *  保存时以此为 expectedUpdatedAt；不能直接用 flow.meta.updatedAt，
+   *  因为 commit() 每次编辑都会拨快它，会导致每次保存都误判磁盘冲突。 */
+  baseUpdatedAt: string | null;
   catalog: Catalog | null;
   selectedNodeId: string | null;
   dirty: boolean;
@@ -104,6 +108,7 @@ export const useEditorStore = create<EditorState>((set, get) => {
 
   return {
     flow: null,
+    baseUpdatedAt: null,
     catalog: null,
     selectedNodeId: null,
     dirty: false,
@@ -116,7 +121,14 @@ export const useEditorStore = create<EditorState>((set, get) => {
       // 切换流程时清掉上一次的运行面板状态，避免显示旧流程的运行结果
       const runState = useRunStore.getState();
       if (!runState.running) runState.clear();
-      set({ flow, selectedNodeId: null, dirty: false, past: [], future: [] });
+      set({
+        flow,
+        selectedNodeId: null,
+        dirty: false,
+        past: [],
+        future: [],
+        baseUpdatedAt: flow.meta?.updatedAt ?? null
+      });
     },
 
     selectNode: (id) => set({ selectedNodeId: id }),
@@ -340,9 +352,11 @@ export const useEditorStore = create<EditorState>((set, get) => {
     },
 
     markSaved: () => set({ dirty: false }),
-    syncSavedFlow: (flow) => set({ flow, dirty: false }),
+    syncSavedFlow: (flow) =>
+      set({ flow, dirty: false, baseUpdatedAt: flow.meta?.updatedAt ?? null }),
 
-    reset: () => set({ flow: null, selectedNodeId: null, dirty: false, past: [], future: [] })
+    reset: () =>
+      set({ flow: null, baseUpdatedAt: null, selectedNodeId: null, dirty: false, past: [], future: [] })
   };
 });