优化项目代码

source/TUI/app.py

@@ -36,5 +36,5 @@ class XHSDownloader(App):
     async def action_settings(self):
         await self.push_screen("setting")
 
-    async def action_back(self):
+    async def action_index(self):
         await self.push_screen("index")

source/TUI/setting.py

@@ -15,7 +15,7 @@ class Setting(Screen):
         "static/css/setting.tcss")
     BINDINGS = [
         Binding(key="q", action="quit", description="退出程序"),
-        Binding(key="b", action="back", description="返回首页"),
+        Binding(key="b", action="index", description="返回首页"),
     ]
 
     def compose(self) -> ComposeResult: