fix(index): 修复选预设时长时页面向上跳动

input 聚焦键盘弹起时点预设,onSelectPreset 清空 customInput 触发
adjust-position 重算导致页面上跳。点预设时先失焦 input 收键盘。

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

pages/index/index.js

@@ -28,6 +28,7 @@ Page({
     planTotal: 7,
     planProgress: 0,
     showPicker: false,
+    pickerInputFocus: false,
     presets: [30, 60, 90, 120, 180, 300],
     customDuration: 60,
     customInput: '',
@@ -170,7 +171,12 @@ Page({
 
   onSelectPreset(e) {
     const val = e.currentTarget.dataset.value
-    this.setData({ customDuration: val, customInput: '' })
+    // 收起键盘(失焦 input),避免清空 customInput 时触发 adjust-position 让页面向上跳
+    this.setData({ pickerInputFocus: false, customDuration: val, customInput: '' })
+  },
+
+  onPickerInputFocus() {
+    this.setData({ pickerInputFocus: true })
   },
 
   onCustomInput(e) {