重构项目结构，删除未使用的组件和文件，添加主页和模态页实现

app/(tabs)/_layout.tsx

@@ -1,35 +0,0 @@
-import { Tabs } from 'expo-router';
-import React from 'react';
-
-import { HapticTab } from '@/components/haptic-tab';
-import { IconSymbol } from '@/components/ui/icon-symbol';
-import { Colors } from '@/constants/theme';
-import { useColorScheme } from '@/hooks/use-color-scheme';
-
-export default function TabLayout() {
-  const colorScheme = useColorScheme();
-
-  return (
-    <Tabs
-      screenOptions={{
-        tabBarActiveTintColor: Colors[colorScheme ?? 'light'].tint,
-        headerShown: false,
-        tabBarButton: HapticTab,
-      }}>
-      <Tabs.Screen
-        name="index"
-        options={{
-          title: 'Home',
-          tabBarIcon: ({ color }) => <IconSymbol size={28} name="house.fill" color={color} />,
-        }}
-      />
-      <Tabs.Screen
-        name="explore"
-        options={{
-          title: 'Explore',
-          tabBarIcon: ({ color }) => <IconSymbol size={28} name="paperplane.fill" color={color} />,
-        }}
-      />
-    </Tabs>
-  );
-}