feat(fasting): 新增轻断食功能模块

新增完整的轻断食功能，包括：
- 断食计划列表和详情页面，支持12-12、14-10、16-8、18-6四种计划
- 断食状态实时追踪和倒计时显示
- 自定义开始时间选择器
- 断食通知提醒功能
- Redux状态管理和数据持久化
- 新增tab导航入口和路由配置

components/ui/FloatingSelectionCard.tsx

@@ -1,5 +1,6 @@
 import { Ionicons } from '@expo/vector-icons';
 import { BlurView } from 'expo-blur';
+import { GlassView, isLiquidGlassAvailable } from 'expo-glass-effect';
 import React from 'react';
 import {
   Modal,
@@ -22,6 +23,21 @@ export function FloatingSelectionCard({
   title,
   children
 }: FloatingSelectionCardProps) {
+  const glassAvailable = isLiquidGlassAvailable();
+
+  const CloseWrapper = glassAvailable ? GlassView : View;
+  const closeInnerStyle = [
+    styles.closeButtonInnerBase,
+    glassAvailable ? styles.closeButtonInnerGlass : styles.closeButtonInnerFallback,
+  ];
+  const closeWrapperProps = glassAvailable
+    ? {
+        glassEffectStyle: 'regular' as const,
+        tintColor: 'rgba(255,255,255,0.45)',
+        isInteractive: true,
+      }
+    : {};
+
   return (
     <Modal
       visible={visible}
@@ -52,9 +68,9 @@ export function FloatingSelectionCard({
             onPress={onClose}
             activeOpacity={0.7}
           >
-            <View style={styles.closeButtonInner}>
+            <CloseWrapper style={closeInnerStyle} {...closeWrapperProps}>
               <Ionicons name="close" size={24} color="#666" />
-            </View>
+            </CloseWrapper>
           </TouchableOpacity>
         </View>
       </BlurView>
@@ -67,6 +83,7 @@ const styles = StyleSheet.create({
     flex: 1,
     justifyContent: 'flex-end',
     alignItems: 'center',
+    paddingHorizontal: 20,
   },
   backdrop: {
     position: 'absolute',
@@ -103,11 +120,10 @@ const styles = StyleSheet.create({
   closeButton: {
     marginTop: 20,
   },
-  closeButtonInner: {
+  closeButtonInnerBase: {
     width: 44,
     height: 44,
     borderRadius: 22,
-    backgroundColor: 'rgba(255, 255, 255, 0.9)',
     alignItems: 'center',
     justifyContent: 'center',
     shadowColor: '#000',
@@ -119,4 +135,12 @@ const styles = StyleSheet.create({
     shadowRadius: 4,
     elevation: 3,
   },
-});
+  closeButtonInnerGlass: {
+    borderWidth: StyleSheet.hairlineWidth,
+    borderColor: 'rgba(255,255,255,0.45)',
+    backgroundColor: 'rgba(255,255,255,0.35)',
+  },
+  closeButtonInnerFallback: {
+    backgroundColor: 'rgba(255, 255, 255, 0.9)',
+  },
+});