fix: 修复头像存储、日历详情数据与弹窗定位问题

- settings: 补上缺失的 util 导入,onChooseAvatar 不再抛
  ReferenceError,头像走 data URI 永久存储主路径
- records: 日历详情改用 dateOnly 比较,修复详情永远显示 0 次/0 时长
- records: 日历详情弹窗从 ui-modal 改为普通 view + fixed,
  修复被底部 dock 遮挡/不居中;补暗黑阴影描边与滚动穿透处理

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

pages/settings/settings.js

@@ -5,6 +5,7 @@ const iconsMod = require('../../utils/icons')
 const cloud = require('../../utils/cloud')
 const config = require('../../config')
 const darkMod = require('../../utils/darkMode')
+const util = require('../../utils/util')
 
 /**
  * Build the simplified plans list shown in the settings UI by overlaying