aiagent icon样式修改

schoolNewsWeb/src/views/public/ai/AIAgent.vue

@@ -105,7 +105,7 @@
               <div class="message-avatar">
                 <div class="avatar-circle ai-avatar">
                   <img v-if="agentAvatarUrl" :src="agentAvatarUrl" alt="AI助手" class="ai-avatar-img" />
-                  <span v-else>🤖</span>
+                  <img v-else src="@/assets/imgs/assistant.svg" alt="AI助手" class="ai-avatar-img" />
                 </div>
               </div>
               <div class="message-content">
@@ -1142,6 +1142,7 @@ onUnmounted(() => {
 .ai-agent {
   position: fixed;
   z-index: 50;
+  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
 
   &.expanded {
     top: 50%;