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/home/PostDetailScreen.tsx

@@ -2054,30 +2054,23 @@ const styles = StyleSheet.create({
     paddingVertical: spacing.xs,
     borderRadius: borderRadius.md,
   },
-  // 空评论状态样式
+  // 空评论状态样式（与平铺评论区一致，无卡片气泡）
   emptyCommentsContainer: {
     alignItems: 'center',
     justifyContent: 'center',
-    marginHorizontal: spacing.lg,
-    marginTop: spacing.lg,
-    marginBottom: spacing.md,
-    paddingVertical: spacing.xl + spacing.md,
-    paddingHorizontal: spacing.lg,
-    borderRadius: borderRadius.lg,
-    backgroundColor: colors.background.paper,
-    borderWidth: StyleSheet.hairlineWidth,
-    borderColor: colors.divider,
+    marginHorizontal: spacing.md,
+    marginTop: spacing.md,
+    marginBottom: spacing.lg,
+    paddingVertical: spacing.xl,
+    paddingHorizontal: spacing.md,
   },
   emptyCommentsIconWrapper: {
-    width: 44,
-    height: 44,
-    borderRadius: 22,
-    backgroundColor: colors.background.default,
-    borderWidth: StyleSheet.hairlineWidth,
-    borderColor: colors.divider,
+    width: 40,
+    height: 40,
     alignItems: 'center',
     justifyContent: 'center',
     marginBottom: spacing.sm,
+    opacity: 0.85,
   },
   emptyCommentsTitle: {
     fontSize: fontSizes.md,