fix: simplify chat empty state

web/apps/web-ele/src/components/ai-loading/AiWorkingAnimation.vue

@@ -122,7 +122,7 @@ onUnmounted(() => {
     </div>
 
     <!-- 飘过的代码行 - 左侧 -->
-    <div class="flying-code left-side">
+    <div v-if="showBackground" class="flying-code left-side">
       <div class="code-row" style="--i: 0">
         const handleSubmit = async () => {
       </div>
@@ -138,7 +138,7 @@ onUnmounted(() => {
     </div>
 
     <!-- 飘过的代码行 - 右侧 -->
-    <div class="flying-code right-side">
+    <div v-if="showBackground" class="flying-code right-side">
       <div class="code-row" style="--i: 0">function createApp(config) {</div>
       <div class="code-row" style="--i: 1">const state = reactive({});</div>
       <div class="code-row" style="--i: 2">watch(() => props.value, cb);</div>
@@ -152,7 +152,7 @@ onUnmounted(() => {
     </div>
 
     <!-- 数据粒子流 -->
-    <div class="particles">
+    <div v-if="showBackground" class="particles">
       <span
         v-for="p in particles"
         :key="p.id"
@@ -178,7 +178,7 @@ onUnmounted(() => {
       <!-- 机器人工作台 -->
       <div class="workstation">
         <!-- 思考气泡 -->
-        <div class="thought-bubble">
+        <div v-if="showBackground" class="thought-bubble">
           <span class="thought-text">{{ thoughts[currentThought] }}</span>
           <div class="bubble-dots"><span></span><span></span><span></span></div>
         </div>
@@ -284,7 +284,7 @@ onUnmounted(() => {
         <!-- 桌子 -->
         <div class="desk">
           <!-- 小显示器在桌上 -->
-          <div class="mini-monitor">
+          <div v-if="showBackground" class="mini-monitor">
             <div class="monitor-frame">
               <div class="mini-screen">
                 <div class="py-code">
@@ -340,7 +340,7 @@ onUnmounted(() => {
       </div>
 
       <!-- 飘浮代码片段 -->
-      <div class="floating">
+      <div v-if="showBackground" class="floating">
         <span class="code-snippet" style="--x: 8%; --y: 15%; --d: 0s">const app =</span>
         <span class="code-snippet" style="--x: 78%; --y: 20%; --d: 0.8s">async () =></span>
         <span class="code-snippet" style="--x: 5%; --y: 75%; --d: 1.6s">return data</span>