增加上传文件限制和悬浮样式

ui/packages/ai/AiCopilot.vue

@@ -206,7 +206,7 @@ export default {
             <div class="topBar flex">
               <div v-for="(btn,i) in btns" :key="i" class="btn pointer" :style="{backgroundImage: `url(${btn.icon})`}" v-text="btn.label" @click="btn.click"/>
             </div>
-            <ai-uploader ref="uploader" v-model="files" :instance="http" :limit="1" show-loading fileType="file">
+            <ai-uploader ref="uploader" v-model="files" :instance="http" :limit="1" show-loading fileType="file" accept-type=".doc,.docx,.pdf,.txt">
               <div slot="trigger" ref="uploadTrigger"/>
             </ai-uploader>
             <div class="flex end">
@@ -485,6 +485,7 @@ export default {
 
             &:hover {
               opacity: .8;
+              color: #0052F5;
             }
           }
         }