修复队列与 Web 吞掉并存的 sliceWarning

风格归一化与像素规整新增的通用 warning 可以与 sliceWarning 并存，openapi
已放开该组合，但两个消费端仍是二选一：队列 extract_editor_generation_warning
在 warning 存在时根本不读 sliceWarning，Web inline
resolveEditorGenerationWarningMessage 同样直接返回通用告警。

两侧改为与 inline 响应相同的归一策略：只有一条时原样保留，两条并存时按
"通用在前、拆分在后"拼接，队列侧 code 收敛为 multiple-generation-warnings
并复用既有长度上界收敛。同步修正三处仍声明二者互斥的文档。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/components/image-editor/useImageCanvasGenerationSubmissionWorkflow.test.tsx

@@ -2413,6 +2413,65 @@ describe('useImageCanvasGenerationSubmissionWorkflow', () => {
     );
   });
 
+  it('keeps both the common warning and the slice warning when they coexist', async () => {
+    generateEditorIconSpritesheetMock.mockResolvedValueOnce({
+      spritesheetImageSrc: 'data:image/png;base64,sheet',
+      spritesheetWidth: 512,
+      spritesheetHeight: 512,
+      prompt: '图标素材',
+      actualPrompt: '图标素材',
+      model: 'gpt-image-2',
+      provider: 'VectorEngine',
+      taskId: 'task-icons',
+      iconImageSrcs: [],
+      warning: {
+        code: 'unsupported-image-style',
+        reason: '不支持的图片风格，已按无风格继续生成。',
+      },
+      sliceWarning: {
+        code: 'insufficient-connected-components',
+        reason: '连通域数量不足',
+      },
+    });
+    render(
+      <SubmissionWorkflowHarness
+        projectId="editor-project-1"
+        initialDialog={{
+          id: 'dialog-icon',
+          mode: 'icon',
+          prompt: '返回按钮',
+          status: 'idle',
+          composerOpen: true,
+          imageModel: 'gpt-image-2',
+          iconSpecReference: {
+            id: 'spec',
+            label: '图标规范',
+            src: 'data:image/png;base64,c3BlYw==',
+          },
+          iconDescriptions: [],
+          placeholder: {
+            x: 140,
+            y: 160,
+            width: 360,
+            height: 360,
+            originalWidth: 512,
+            originalHeight: 512,
+          },
+        }}
+      />,
+    );
+
+    fireEvent.click(screen.getByRole('button', { name: '设置初始对话' }));
+    fireEvent.click(screen.getByRole('button', { name: '提交图标' }));
+
+    // 风格归一化告警与拆分告警可以并存，两者都必须出现在同一条提示里。
+    await waitFor(() => {
+      expect(screen.getByTestId('generation-warning').textContent).toBe(
+        '不支持的图片风格，已按无风格继续生成。 图集已生成，但自动拆分未完成：连通域数量不足',
+      );
+    });
+  });
+
   it('submits uploaded objectKey icon references before submitting spritesheets', async () => {
     generateEditorIconSpritesheetMock.mockResolvedValueOnce({
       spritesheetImageSrc: 'data:image/png;base64,sheet',

src/components/image-editor/useImageCanvasGenerationSubmissionWorkflow.ts

@@ -457,14 +457,17 @@ function resolveEditorGenerationWarningMessage(
   warning: string | null | undefined,
   sliceWarning: string | null | undefined,
 ) {
+  // 风格归一化和像素规整产生的通用 warning 可以与 sliceWarning 并存，
+  // 这里按“通用在前、拆分在后”拼接成单条提示，不允许其中任何一条被丢弃。
   const commonReason = warning?.trim();
-  if (commonReason) {
-    return commonReason;
-  }
   const sliceReason = sliceWarning?.trim();
-  return sliceReason
+  const prefixedSliceReason = sliceReason
     ? `${EDITOR_SPRITESHEET_SLICE_WARNING_PREFIX}${sliceReason}`
     : undefined;
+  if (commonReason && prefixedSliceReason) {
+    return `${commonReason} ${prefixedSliceReason}`;
+  }
+  return commonReason || prefixedSliceReason;
 }
 
 async function runEditorGenerationWithWalletRefresh<T>(