feat(ui): 记录页月份联动与多项 UI 美化/修复

- records: 底部列表与月份选择器联动，新增 [本月|最近] 分段控件；标题/空态随模式切换
- leaderboard: 领奖台布局(冠军居中+皇冠)、次数标注于底座且三档水平对齐；头像 cloud:// 批量预解析提速(云函数需重新部署)
- index/timer: 主色底图标改白色变体修复隐形；目标数字按微信字体缩放补偿真机遮挡
- settings: 配色方案横滑渐变色卡；头像上传前压缩至 200px
- theme: 新增 teal 主题；暗黑背景统一对齐
- 圆形头像双保险(image 自身 border-radius)修复月/年榜方图

注: cloudfunctions/leaderboard 改动须在开发者工具重新部署才生效。

pages/index/index.js

@@ -14,6 +14,13 @@ Page({
     todayDone: false,
     todayDuration: 0,
     todayTargetText: '',
+    // Ring number font size in rpx. WeChat auto-scales text by the user's
+    // font-size setting (fontSizeScaleFactor) but does NOT scale rpx box
+    // dimensions — so on a real device with enlarged system font the 84rpx
+    // number grows past the fixed-size circular ring and gets clipped. We
+    // cancel that scale here so the number renders at a constant visual size
+    // (matching the devtools/simulator) on every device. See _readFontScale().
+    targetTimeFontSize: 84,
     streakCount: 0,
     planName: '',
     planDay: 1,
@@ -28,9 +35,50 @@ Page({
 
   onLoad() {
     themeMod.applyThemeToPage(this)
+    this._readFontScale()
     this._firstShow = true
   },
 
+  /**
+   * Read the device's WeChat font-size scale and compensate the ring number
+   * so it never overflows the fixed circular clip on real devices.
+   *
+   * WeChat auto-applies `fontSizeScaleFactor` to ALL text (including rpx font
+   * sizes) but leaves rpx box dimensions untouched. A user who bumps up the
+   * system font therefore sees enlarged text inside a non-enlarged ring.
+   *
+   * CRITICAL asymmetry: the DevTools simulator reports the SAME
+   * `fontSizeScaleFactor` as a real device (the user's actual WeChat setting)
+   * but does NOT actually scale rendered text. So if we compensate there, the
+   * number ends up too small in the simulator. We therefore SKIP the
+   * compensation under DevTools (host.env === 'devtools') and keep the design
+   * size — matching what the simulator renders literally.
+   *
+   * On real devices, dividing our design size by the factor cancels the
+   * auto-scale, keeping the number a constant 84rpx-equivalent everywhere.
+   * Bounded so a bad reading can only ever make the number smaller (safe),
+   * never larger (overflow).
+   */
+  _readFontScale() {
+    let factor = 1
+    try {
+      const info = wx.getAppBaseInfo ? wx.getAppBaseInfo() : wx.getSystemInfoSync()
+      const isDevtools = info.host && info.host.env === 'devtools'
+      if (!isDevtools) {
+        if (typeof info.fontSizeScaleFactor === 'number' && info.fontSizeScaleFactor > 0) {
+          factor = info.fontSizeScaleFactor
+        } else if (typeof info.fontSizeSetting === 'number' && info.fontSizeSetting > 0) {
+          // fontSizeScaleFactor == currentFontSize / standardFontSize(17px)
+          factor = info.fontSizeSetting / 17
+        }
+      }
+    } catch (e) {}
+    const DESIGN = 84
+    let size = Math.round(DESIGN / factor)
+    size = Math.max(48, Math.min(96, size))
+    this.setData({ targetTimeFontSize: size })
+  },
+
   onShow() {
     themeMod.applyThemeToPage(this)
     try {
@@ -86,9 +134,12 @@ Page({
     const customPlans = storage.getCustomPlans()
     const plan = planMod.getPlan(settings.planId, customPlans)
     const planDay = planMod.getPlanDay(settings.planId, allRecords, settings.planStartDate, customPlans)
-    const target = planMod.getTodayTarget(settings.planId, Math.min(planDay, plan.totalDays))
+    const clampedDay = Math.min(planDay, plan.totalDays)
+    const target = planMod.getTodayTarget(settings.planId, clampedDay)
 
     const theme = themeMod.getCurrentTheme()
+    // 防御:totalDays 为 0(极端数据损坏)时避免除以 0 得到 NaN
+    const planProgress = plan.totalDays > 0 ? Math.round((clampedDay / plan.totalDays) * 100) : 0
     this.setData({
       theme,
       icons: iconsMod.build(theme),
@@ -98,9 +149,9 @@ Page({
       todayTargetText: util.formatTime(target),
       streakCount: streak.count,
       planName: plan.name,
-      planDay: Math.min(planDay, plan.totalDays),
+      planDay: clampedDay,
       planTotal: plan.totalDays,
-      planProgress: Math.round((Math.min(planDay, plan.totalDays) / plan.totalDays) * 100)
+      planProgress
     })
   },