feat: Add more options for chat messages to copy, download chat entirely

src/assets/locale/zh/option.json

@@ -9,5 +9,20 @@
     "validationSelectModel": "请选择一个模型以继续",
     "deleteHistoryConfirmation": "你确定要删除这个历史记录吗？",
     "editHistoryTitle": "输入一个新的标题",
-    "temporaryChat": "临时聊天"
+    "temporaryChat": "临时聊天",
+    "more": {
+        "copy": {
+            "group": "复制",
+            "asText": "复制为文本",
+            "asMarkdown": "复制为 Markdown",
+            "success": "已复制到剪贴板！"
+        },
+        "download": {
+            "group": "下载",
+            "text": "文本文件 (.txt)",
+            "markdown": "Markdown 文件 (.md)",
+            "json": "JSON 文件 (.json)"
+        },
+        "share": "分享"
+    }
 }