修复重复生成占位的对账判定

收集项目快照中全部同 ID 的生成占位原始记录。

通用队列链在任一重复占位未收口时执行第二次项目读取。

完美像素遇到重复操作占位时失败关闭为冲突。

补充两条缺陷定向测试并同步技术方案与决策记录。

src/components/image-editor/useImageCanvasGenerationWorkflow.ts

@@ -29,7 +29,7 @@ import {
 } from '../../services/image-editor/editorProjectClient';
 import { resizeCropExpandFrame } from './ImageCanvasCropExpandModel';
 import {
-  findCanvasGenerationDialogRecord,
+  findCanvasGenerationDialogRecords,
   isUnresolvedCanvasGenerationDialogRecord,
   PERFECT_PIXEL_RECONCILIATION_WINDOW_MS,
 } from './ImageCanvasEditorModel';
@@ -267,7 +267,7 @@ export function inspectPerfectPixelProjectSnapshot(
   const matchingResources = project.resources.filter(
     (resource) => resource.taskId?.trim() === operation.taskId,
   );
-  const dialog = findCanvasGenerationDialogRecord(
+  const matchingDialogs = findCanvasGenerationDialogRecords(
     project,
     operation.operationId,
   );
@@ -279,6 +279,14 @@ export function inspectPerfectPixelProjectSnapshot(
       message: '权威项目中存在重复的完美像素任务资源，无法自动确认结果。',
     };
   }
+  if (matchingDialogs.length > 1) {
+    return {
+      kind: 'conflict',
+      project,
+      message: '权威项目中存在重复的完美像素占位，无法自动确认结果。',
+    };
+  }
+  const dialog = matchingDialogs[0] ?? null;
   const resource = matchingResources[0] ?? null;
   if (!resource) {
     if (!dialog || isUnresolvedCanvasGenerationDialogRecord(dialog)) {