feat:初始化工程

lib/layout/main_screen.dart

@@ -0,0 +1,76 @@
+import 'package:flisp_app/layout/app_drawer.dart';
+import 'package:flisp_app/pages/flash_page.dart';
+import 'package:flisp_app/pages/notes_Page.dart';
+import 'package:flisp_app/pages/reminders_page.dart';
+import 'package:flisp_app/pages/todo_page.dart';
+import 'package:flisp_app/provider/app_provider.dart';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+class MainScreen extends StatelessWidget {
+  const MainScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Consumer<AppProvider>(
+      builder: (context, appState, child) {
+        return Scaffold(
+          // 侧边抽屉菜单
+          drawer: const AppDrawer(),
+
+          // 顶部导航栏
+          appBar: AppBar(
+            title: const Text('闪灵'),
+            backgroundColor: Colors.blue,
+            foregroundColor: Colors.white,
+            elevation: 0,
+          ),
+
+          // 主体内容
+          body: _buildPage(appState.currentIndex),
+
+          // 底部导航栏
+          bottomNavigationBar: BottomNavigationBar(
+            currentIndex: appState.currentIndex,
+            onTap: (index) => appState.changeTab(index),
+            type: BottomNavigationBarType.fixed,
+            items: const [
+              BottomNavigationBarItem(
+                icon: Icon(Icons.flash_on),
+                label: '闪灵',
+              ),
+              BottomNavigationBarItem(
+                icon: Icon(Icons.note),
+                label: '笔记',
+              ),
+              BottomNavigationBarItem(
+                icon: Icon(Icons.checklist),
+                label: '待办',
+              ),
+              BottomNavigationBarItem(
+                icon: Icon(Icons.notifications),
+                label: '提醒',
+              ),
+            ],
+          ),
+        );
+      },
+    );
+  }
+
+  // 根据索引构建对应页面
+  Widget _buildPage(int index) {
+    switch (index) {
+      case 0:
+        return const FlashPage();
+      case 1:
+        return const NotesPage();
+      case 2:
+        return const TodoPage();
+      case 3:
+        return const RemindersPage();
+      default:
+        return const FlashPage();
+    }
+  }
+}