合并图标规范与图集生成优化

合入 PR 137 的图标规范生成、稳定引用与图集提示词链路
保留主分支现行音效提交、Prompt 模块与结果压缩逻辑
解决 External Worker、生成提交和客户端测试冲突

src/components/image-editor/ImageCanvasGenerationDialogModel.ts

@@ -247,7 +247,7 @@ export function createSceneGenerationDialogDraft({
 }
 
 function shouldUseSpecPlaceholderValues(specType: SpecGenerationType) {
-  return specType === 'character' || specType === 'ui';
+  return specType === 'character' || specType === 'icon';
 }
 
 export function createSpecDialogDraft({
@@ -895,7 +895,7 @@ function resolveSpecTypeFromSourceLayer(
   if (fields.has('头身比') || fields.has('角色视角')) {
     return 'character';
   }
-  return 'ui';
+  return 'icon';
 }
 
 function restoreSpecValuesFromLayer(