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.

src/screens/schedule/ScheduleScreen.tsx

@@ -379,6 +379,16 @@ export const ScheduleScreen: React.FC = () => {
   // 渲染周选择器
   const renderWeekSelector = () => (
     <View style={styles.weekSelector}>
+      {router.canGoBack() ? (
+        <TouchableOpacity
+          style={styles.weekBarIconButton}
+          onPress={() => router.back()}
+          accessibilityRole="button"
+          accessibilityLabel="返回"
+        >
+          <MaterialCommunityIcons name="chevron-left" size={28} color="#FFFFFF" />
+        </TouchableOpacity>
+      ) : null}
       <TouchableOpacity
         style={styles.settingsButton}
         onPress={() => setIsSettingsModalVisible(true)}
@@ -1066,6 +1076,13 @@ const styles = StyleSheet.create({
     flexDirection: 'row',
     alignItems: 'center',
   },
+  weekBarIconButton: {
+    width: 40,
+    height: 40,
+    justifyContent: 'center',
+    alignItems: 'center',
+    marginLeft: spacing.sm,
+  },
   settingsButton: {
     width: 40,
     height: 40,