首页老黄历全面升级 + 修复农历转换核心bug

【重要修复】重写农历双向转换算法（原来全错）：
- solarToLunar/lunarToSolar 改用标准算法（基准1900-01-31正月初一，UTC避免时区误差）
- 验证：2026春节2-17、中秋9-25、端午6-19、2023闰二月全部正确

【首页大日历】
- 日期数字加大到240rpx，超醒目
- 节假日红色喜庆卡片+红数字（春节/国庆/中秋等法定假日）
- 工作日绿色卡片+绿数字（一眼知道要上班）
- 周末红色数字+米黄卡片
- 节气显示具体时刻（如 立秋 20:29）
- 初一/十五金色标记（可在设置关闭）
- 佛历提醒：距下一佛诞还有几天（可在设置开启）

【全屏放大弹窗（老年友好）】
- 大日历卡片/宜忌/详情/节日速查 点击均可全屏放大
- 宜忌放大后字号44rpx，详情放大后40rpx

【月历视图】
- swiper 左右滑动换月，预计算5个月居中显示
- 滑到边缘自动补月，可无限滚动
- 点选日期切回日视图

【节日速查】
- 首页显示近期5个节日（中秋/重阳等）+公历日期+倒计时
- 点击直接跳到该日老黄历

【设置页】
- 新增'显示佛历提醒'开关（默认关）
- 新增'初一十五高亮'开关（默认开）

mini/pages/home/home.js

@@ -1,21 +1,40 @@
-const { getDayInfo, getAlmanacInfo, getMonthCalendar } = require('../../utils/core/index.js');
+const {
+  getDayInfo, getAlmanacInfo, getMonthCalendar,
+  getLegalHoliday, isWorkday, getUpcomingFestivals, getNextBuddhistFestival
+} = require('../../utils/core/index.js');
+const { SOLAR_TERM_TIMES } = require('../../utils/core/data.js');
 
 function pad(n) { return String(n).padStart(2, '0'); }
 function fmt(y, m, d) { return `${y}-${pad(m)}-${pad(d)}`; }
 
+const MONTH_SPAN = 2; // 当前月前后各2个月，共5个月
+
 Page({
   data: {
     statusBarHeight: 20,
     navBarHeight: 44,
-    viewMode: 'day',          // day | month
+    viewMode: 'day',
     dayInfo: {},
     almanac: {},
-    // 月历
-    year: 0,
-    month: 0,
+    legalHoliday: null,
+    workday: true,
+    termTime: '',
+    isFirstOrFifteen: false,
+    nextBuddhist: null,
+    showBuddhist: false,
+    highlightLunar: true,
+    upcoming: [],
+    // 月历 swiper
+    monthList: [],        // [{key, year, month, weeks}]
+    monthIndex: 2,        // 当前居中
+    currentYear: 0,
+    currentMonth: 0,
     weekHeaders: ['日', '一', '二', '三', '四', '五', '六'],
-    calendarDays: [],
-    selectedDay: null
+    // 全屏弹窗
+    zoomVisible: false,
+    zoomTitle: '',
+    zoomType: '',         // yiji | detail | fest
+    zoomData: null
   },
 
   onLoad() {
@@ -23,18 +42,33 @@ Page({
     const menu = wx.getMenuButtonBoundingClientRect ? wx.getMenuButtonBoundingClientRect() : null;
     const statusBarHeight = sys.statusBarHeight || 20;
     let navBarHeight = 44;
-    if (menu && menu.top) {
-      navBarHeight = (menu.top - statusBarHeight) * 2 + menu.height;
-    }
+    if (menu && menu.top) navBarHeight = (menu.top - statusBarHeight) * 2 + menu.height;
     this.setData({ statusBarHeight, navBarHeight });
+    this.loadSettings();
     this.loadDay(new Date());
+    this.loadUpcoming();
+  },
+
+  onShow() {
+    this.loadSettings();
+    // 设置可能变化，刷新
+    if (this.data.dayInfo.solarYear) this.refreshDerived();
+  },
+
+  loadSettings() {
+    const s = wx.getStorageSync('lunar-settings') || {};
+    this.setData({
+      showBuddhist: s.showBuddhist === true,
+      highlightLunar: s.highlightLunar !== false
+    });
   },
 
   onPullDownRefresh() {
     if (this.data.viewMode === 'day') {
       this.loadDay(new Date());
+      this.loadUpcoming();
     } else {
-      this.loadCalendar();
+      this.buildMonthList(this.data.currentYear, this.data.currentMonth);
     }
     wx.stopPullDownRefresh();
   },
@@ -46,10 +80,26 @@ Page({
     const d = date.getDate();
     const dayInfo = getDayInfo(y, m, d);
     const almanac = getAlmanacInfo(y, m, d);
-    this.setData({ dayInfo, almanac, year: y, month: m });
+    this.setData({ dayInfo, almanac, currentYear: y, currentMonth: m });
+    this.refreshDerived();
+  },
+
+  /** 计算派生数据（节假日/工作日/佛历/初一十五） */
+  refreshDerived() {
+    const { dayInfo, showBuddhist, highlightLunar } = this.data;
+    const { solarYear: y, solarMonth: m, solarDay: d } = dayInfo;
+    const legalHoliday = getLegalHoliday(y, m, d);
+    const workday = isWorkday(y, m, d);
+    const termTime = dayInfo.solarTerm ? (SOLAR_TERM_TIMES[dayInfo.solarTerm] || '') : '';
+    const isFirstOrFifteen = highlightLunar && (dayInfo.lunarDay === 1 || dayInfo.lunarDay === 15);
+    const nextBuddhist = showBuddhist ? getNextBuddhistFestival() : null;
+    this.setData({ legalHoliday, workday, termTime, isFirstOrFifteen, nextBuddhist });
+  },
+
+  loadUpcoming() {
+    this.setData({ upcoming: getUpcomingFestivals(5) });
   },
 
-  /** 前一天 / 后一天 */
   prevDay() { this.shiftDay(-1); },
   nextDay() { this.shiftDay(1); },
   shiftDay(delta) {
@@ -58,45 +108,72 @@ Page({
     this.loadDay(date);
   },
 
-  /** 回到今天 */
   backToday() {
     this.loadDay(new Date());
+    this.loadUpcoming();
   },
 
-  /** 切换 日视图/月历视图 */
+  /** 切换 日/月 视图 */
   toggleView() {
     const mode = this.data.viewMode === 'day' ? 'month' : 'day';
     this.setData({ viewMode: mode });
     if (mode === 'month') {
       const { dayInfo } = this.data;
-      this.setData({ year: dayInfo.solarYear, month: dayInfo.solarMonth }, () => this.loadCalendar());
+      this.buildMonthList(dayInfo.solarYear, dayInfo.solarMonth);
     }
   },
 
-  /** 月历 */
-  loadCalendar() {
-    const { year, month } = this.data;
-    const weeks = getMonthCalendar(year, month);
-    const calendarDays = [];
-    weeks.forEach(w => w.forEach(d => calendarDays.push(d)));
-    this.setData({ calendarDays });
+  /** 构建5个月的数据，居中显示 */
+  buildMonthList(year, month) {
+    const monthList = [];
+    for (let i = -MONTH_SPAN; i <= MONTH_SPAN; i++) {
+      let y = year, m = month + i;
+      while (m < 1) { m += 12; y--; }
+      while (m > 12) { m -= 12; y++; }
+      const weeks = getMonthCalendar(y, m);
+      monthList.push({ key: `${y}-${m}`, year: y, month: m, weeks });
+    }
+    this.setData({ monthList, monthIndex: MONTH_SPAN, currentYear: year, currentMonth: month });
   },
 
-  prevMonth() {
-    let { year, month } = this.data;
-    month--;
-    if (month < 1) { month = 12; year--; }
-    this.setData({ year, month }, () => this.loadCalendar());
+  /** swiper 切换 */
+  onMonthSwiperChange(e) {
+    const index = e.detail.current;
+    const { monthList } = this.data;
+    const cur = monthList[index];
+    this.setData({ monthIndex: index, currentYear: cur.year, currentMonth: cur.month });
+
+    // 边缘时向对应方向补一个月，保持可无限滚动
+    if (index === 0) {
+      this.prependMonth();
+    } else if (index === monthList.length - 1) {
+      this.appendMonth();
+    }
   },
 
-  nextMonth() {
-    let { year, month } = this.data;
-    month++;
-    if (month > 12) { month = 1; year++; }
-    this.setData({ year, month }, () => this.loadCalendar());
+  prependMonth() {
+    const { monthList } = this.data;
+    const first = monthList[0];
+    let y = first.year, m = first.month - 1;
+    if (m < 1) { m = 12; y--; }
+    const weeks = getMonthCalendar(y, m);
+    monthList.unshift({ key: `${y}-${m}`, year: y, month: m, weeks });
+    if (monthList.length > 7) monthList.pop();
+    this.setData({ monthList, monthIndex: this.data.monthIndex + 1 });
   },
 
-  /** 月历中选中某天 → 切回日视图 */
+  appendMonth() {
+    const { monthList } = this.data;
+    const last = monthList[monthList.length - 1];
+    let y = last.year, m = last.month + 1;
+    if (m > 12) { m = 1; y++; }
+    const weeks = getMonthCalendar(y, m);
+    monthList.push({ key: `${y}-${m}`, year: y, month: m, weeks });
+    if (monthList.length > 7) monthList.shift();
+    this.setData({ monthList, monthIndex: this.data.monthIndex - 1 });
+  },
+
+  /** 月历点选某天 → 切回日视图 */
   selectDay(e) {
     const date = e.currentTarget.dataset.date;
     const [y, m, d] = date.split('-').map(Number);
@@ -104,13 +181,57 @@ Page({
     this.setData({ viewMode: 'day' });
   },
 
-  /** 跳详情页 */
   goDetail() {
     const { dayInfo } = this.data;
     wx.navigateTo({ url: `/pages/day-detail/day-detail?date=${fmt(dayInfo.solarYear, dayInfo.solarMonth, dayInfo.solarDay)}` });
   },
 
+  /** 跳转到某节日的老黄历 */
+  goFestival(e) {
+    const date = e.currentTarget.dataset.date;
+    const [y, m, d] = date.split('-').map(Number);
+    this.loadDay(new Date(y, m - 1, d));
+    this.setData({ viewMode: 'day' });
+    wx.pageScrollTo && wx.pageScrollTo({ scrollTop: 0, duration: 0 });
+  },
+
+  /** ===== 全屏放大弹窗 ===== */
+  openZoom(e) {
+    const type = e.currentTarget.dataset.type;
+    const { dayInfo, almanac, legalHoliday, termTime } = this.data;
+    let zoomTitle = '';
+    let zoomData = null;
+    if (type === 'yiji') {
+      zoomTitle = `${dayInfo.solarMonth}月${dayInfo.solarDay}日 宜忌`;
+      zoomData = { recommends: almanac.recommends, avoids: almanac.avoids };
+    } else if (type === 'detail') {
+      zoomTitle = `${dayInfo.solarMonth}月${dayInfo.solarDay}日 黄历详情`;
+      zoomData = {
+        lunar: `${dayInfo.lunarMonthName}${dayInfo.lunarDayName}`,
+        ganzhi: `${dayInfo.lunarYearGanzhi}年 ${dayInfo.lunarMonthGanzhi}月 ${dayInfo.lunarDayGanzhi}日`,
+        duty: almanac.duty,
+        twelveStar: `${almanac.twelveStar.name}（${almanac.twelveStar.ecliptic}）`,
+        twentyEightStar: almanac.twentyEightStar.name,
+        sixStar: almanac.sixStar,
+        clash: `冲${almanac.clash} 煞${almanac.evilDirection}`,
+        pengZu: almanac.pengZu,
+        legalHoliday,
+        termTime: dayInfo.solarTerm ? `${dayInfo.solarTerm} ${termTime}` : ''
+      };
+    } else if (type === 'fest') {
+      zoomTitle = '近期节日';
+      zoomData = { upcoming: this.data.upcoming };
+    }
+    this.setData({ zoomVisible: true, zoomTitle, zoomType: type, zoomData });
+  },
+
+  closeZoom() {
+    this.setData({ zoomVisible: false });
+  },
+
   navTo(e) {
     wx.navigateTo({ url: e.currentTarget.dataset.url });
-  }
+  },
+
+  noop() {}
 });