✨ feat: 完整应用重构 - 优化界面架构与用户体验

主要变更：
- 重构应用界面：优化首页、登录、认证流程
- 新增用户档案模块：包含完整的档案管理组件
- 优化路由结构：重新组织页面布局和导航
- 改进API集成：新增活动、内容分类等API模块
- 删除冗余组件：清理不必要的文件和依赖

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

components/profile/profile-loading-state.tsx

@@ -0,0 +1,40 @@
+import React from 'react';
+import { View, ActivityIndicator } from 'react-native';
+import { ThemedText } from '@/components/themed-text';
+import { useColorScheme } from '@/hooks/use-color-scheme';
+
+export function ProfileLoadingState() {
+  const colorScheme = useColorScheme();
+  const palette = colorScheme === 'dark' ? darkPalette : lightPalette;
+
+  return (
+    <View style={styles.loadingWrap}>
+      <ActivityIndicator size="large" color={palette.accent} />
+      <ThemedText style={[styles.loadingText, { color: palette.textSecondary }]}>
+        Loading content...
+      </ThemedText>
+    </View>
+  );
+}
+
+const darkPalette = {
+  textSecondary: '#8E9098',
+  accent: '#B7FF2F',
+};
+
+const lightPalette = {
+  textSecondary: '#5E6474',
+  accent: '#405CFF',
+};
+
+const styles = {
+  loadingWrap: {
+    alignItems: 'center' as const,
+    paddingTop: 48,
+    paddingBottom: 48,
+  },
+  loadingText: {
+    marginTop: 12,
+    fontSize: 14,
+  },
+};