feat(desktop): pipeline result preview + industry templates + onboarding auto-trigger

Sprint 2: 产品体验打磨 + 行业模板

- Create PipelineResultPreview component with tab-based output switching
- Connect workflow/hand messages to PresentationContainer in ChatArea
- Add auto-trigger first Hand after onboarding (industry-specific queries)
- Seed 3 industry agent templates (education, healthcare, design-shantou)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktop/src/components/ChatArea.tsx

@@ -32,6 +32,8 @@ import { ChatMode } from './ai/ChatMode';
 import { ModelSelector } from './ai/ModelSelector';
 import { TaskProgress } from './ai/TaskProgress';
 import { SuggestionChips } from './ai/SuggestionChips';
+import { PipelineResultPreview } from './pipeline/PipelineResultPreview';
+import { PresentationContainer } from './presentation/PresentationContainer';
 // TokenMeter temporarily unused — using inline text counter instead
 
 // Default heights for virtualized messages
@@ -665,6 +667,20 @@ function MessageBubble({ message, setInput }: { message: Message; setInput: (tex
                   )
                 : '...'}
             </div>
+            {/* Pipeline / Hand result presentation */}
+            {!isUser && (message.role === 'workflow' || message.role === 'hand') && message.workflowResult && typeof message.workflowResult === 'object' && message.workflowResult !== null && (
+              <div className="mt-3">
+                <PipelineResultPreview
+                  outputs={message.workflowResult as Record<string, unknown>}
+                  pipelineId={message.workflowId}
+                />
+              </div>
+            )}
+            {!isUser && message.role === 'hand' && message.handResult && typeof message.handResult === 'object' && message.handResult !== null && !message.workflowResult && (
+              <div className="mt-3">
+                <PresentationContainer data={message.handResult} />
+              </div>
+            )}
             {message.error && (
               <div className="flex items-center gap-2 mt-2">
                 <p className="text-xs text-red-500">{message.error}</p>