feat(Apps): introduce Apps tab and related screens for enhanced navigation

- Added a new "Apps" tab in the TabsLayout, providing users with access to various applications.
- Created AppsScreen to display app entries, including a schedule feature with a calendar icon.
- Implemented routing for the schedule and course screens under the new Apps tab structure.
- Updated navigation hrefs to reflect the new Apps section, improving overall user experience.
- Refactored HomeScreen to manage bottom tab visibility based on scroll events, enhancing usability.

app/(app)/(tabs)/_layout.tsx

@@ -61,15 +61,6 @@ export default function TabsLayout() {
           ),
         }}
       />
-      <Tabs.Screen
-        name="schedule"
-        options={{
-          title: '课表',
-          tabBarIcon: ({ color, focused }) => (
-            <MaterialCommunityIcons name="calendar-today" size={focused ? 24 : 22} color={color} />
-          ),
-        }}
-      />
       <Tabs.Screen
         name="messages"
         options={{
@@ -84,6 +75,19 @@ export default function TabsLayout() {
           ),
         }}
       />
+      <Tabs.Screen
+        name="apps"
+        options={{
+          title: '应用',
+          tabBarIcon: ({ color, focused }) => (
+            <MaterialCommunityIcons
+              name={focused ? 'view-grid' : 'view-grid-outline'}
+              size={focused ? 24 : 22}
+              color={color}
+            />
+          ),
+        }}
+      />
       <Tabs.Screen
         name="profile"
         options={{