fix(design): preserve command outcome certainty

src/pages/ImageCanvas/DesignConversationPane.tsx

@@ -3,6 +3,7 @@ import { Loader2, MessageSquareText, Send, Sparkles } from 'lucide-react';
 import { toast } from 'sonner';
 import { Button } from '@/components/ui/button';
 import { Textarea } from '@/components/ui/textarea';
+import { ImageWorkspaceApiError } from '@/lib/image-workspace';
 import { cn } from '@/lib/utils';
 import { useImageWorkspaceStore } from '@/stores/image-workspace';
 import type { DesignWorkspace } from '../../../shared/image-workspace';
@@ -14,6 +15,32 @@ const STARTER_MESSAGES = [
   '做一张社团活动海报',
 ];
 
+function chatFailureMessage(error: unknown): string {
+  if (error instanceof ImageWorkspaceApiError) {
+    if (error.commandOutcome === 'unknown') {
+      return error.status === 401 || error.status === 403
+        ? '登录已过期，这条消息的结果还没确认；重新登录后请继续原操作'
+        : '暂时没能确认这条消息的处理结果，内容还在输入框里';
+    }
+    const messages: Record<string, string> = {
+      design_reasoner_invalid: 'AI 没有整理好这次想法，请再试一次',
+      design_reasoner_unavailable: 'AI 现在有点忙，暂时没能整理这次想法，请稍后再试',
+      design_agent_run_failed: 'AI 这次没有整理好，内容还在输入框里，请再试一次',
+      design_agent_run_cancelled: '这次整理已停止，内容还在输入框里',
+      design_revision_conflict: '设计内容刚刚更新了，请再发送一次',
+      design_direction_revision_conflict: '设计内容刚刚更新了，请再发送一次',
+      auth_required: '请先登录，再继续创作',
+      auth_expired: '登录已过期，请重新登录后继续创作',
+    };
+    const message = messages[error.code.toLowerCase()];
+    if (message) return message;
+    if (error.commandOutcome === 'definitive_failure') {
+      return 'AI 这次没有完成设计整理，内容还在输入框里，请再试一次';
+    }
+  }
+  return '暂时没能确认这条消息的处理结果，内容还在输入框里';
+}
+
 export function DesignConversationPane({ workspace }: { workspace: DesignWorkspace }) {
   const chatDraft = useImageWorkspaceStore((state) => state.chatDraft);
   const setChatDraft = useImageWorkspaceStore((state) => state.setChatDraft);
@@ -43,8 +70,8 @@ export function DesignConversationPane({ workspace }: { workspace: DesignWorkspa
 
   const submit = () => {
     if (!chatDraft.trim() || submittingChat) return;
-    void sendChat().catch(() => {
-      toast.error('消息没有发出去，请再试一次');
+    void sendChat().catch((error) => {
+      toast.error(chatFailureMessage(error));
     });
   };