ui: AI撰写tab增加机器人头像图标

src/pages/ReportEditor.tsx

@@ -1971,10 +1971,11 @@ export default function ReportEditor() {
                 <button 
                   key={tab}
                   onClick={() => { setActiveTab(tab); stateRef.current = { ...stateRef.current, activeTab: tab }; saveDraftToStorage(); }}
-                  className={`flex-1 py-4 text-xs font-bold transition-all border-b-2 uppercase tracking-wider ${
+                  className={`flex-1 py-4 text-xs font-bold transition-all border-b-2 uppercase tracking-wider flex items-center justify-center gap-1.5 ${
                     activeTab === tab ? 'text-accent border-accent' : 'text-text-muted border-transparent hover:text-text-main'
                   }`}
                 >
+                  {tab === 'ai' && <Bot size={16} className={activeTab === 'ai' ? 'text-accent' : 'text-text-muted'} />}
                   {tab === 'info' ? '基本信息' : tab === 'video' ? '视频分析' : 'AI撰写'}
                 </button>
               ))}