refactor: Hide the assistant, page embedding, and other third-party embedded applications' add to dashboard button

Author: ziyujiahao

frontend/src/views/chat/chat-block/ChartBlock.vue

@@ -395,7 +395,7 @@ watch(
             </div>
           </el-popover>
         </div>
-        <div v-if="message?.record?.chart">
+        <div v-if="message?.record?.chart && !isAssistant">
           <el-tooltip effect="dark" :content="t('chat.add_to_dashboard')" placement="top">
             <el-button class="tool-btn" text @click="addToDashboard">
               <el-icon size="16">