feat: v1.5 — plan editor, voice prompts, UI polish

Major features:
- Training plan editor: edit preset days/duration per plan (in-place
  override via custom_plans storage; preset ids preserved so existing
  records stay valid)
- Voice prompts at 4 fixed points during training (halfway / 30s /
  10s / done) via Tencent Cloud TTS (cloudfunctions/tts + utils/voice.js)
- Free-training button: switched from outline (transparent) to ghost
  variant (theme-tinted) for visual weight

Bug fixes:
- 4 functional pages: SVG data URIs failed to render in WeChat because
  '\#' in colors was parsed as a data-URI fragment delimiter. encode the
  whole SVG via encodeURIComponent in utils/icons.js build().
- Old records (saved before id field was added) could not be deleted
  (data-id was empty, triggered defensive guard). Backfill stable
  legacy-<month>-<index>-<duration> ids in getRecords() and persist.
- settings.js plan-row editor button event was bubbling up to the row's
  bindtap (which also fired onSelectPlan). Wrapped in catch:tap.

UI:
- Settings page: 3 hardcoded plans replaced with dynamic buildPlansList
  that overlays custom_plans on top of presets
- Plan editor: bottom-sheet modal in settings page (regular view, not
  ui-modal — WeChat custom component root element drops position:fixed
  in this runtime)
- Free-training button: rounded pill style, full-width, 24rpx gap from
  primary action; bottom sheet uses max-height: 88vh + internal scroll
- Version bumped to v1.5, last updated 2026-06-10

Removed:
- Daily reminder section (dailyReminder / reminderTime) — replaced by
  the 4 voice prompts which cover the same user need without requiring
  long-term scheduling that WeChat mini-programs can't actually do

Misc:
- utils/plan.js refactored to formula-driven: presets declare
  totalDays/startTarget/increment/cycleDays, days[] is generated. Same
  formula applies to custom plans.
- Timer _remind() guards each prompt on minimum duration so short
  free-mode sessions don't fire 'last30' at the start
- Cloud storage cloud_plans field added to data push payload; restored
  on first install via _restoreFromCloud
- .gitignore added for local AI tool caches (.reasonix/, reasonix.toml,
  .codegraph/daemon.pid)

pages/records/records.js

@@ -1,6 +1,7 @@
 const storage = require('../../utils/storage')
 const util = require('../../utils/util')
 const themeMod = require('../../utils/theme')
+const iconsMod = require('../../utils/icons')
 
 Page({
   data: {
@@ -16,12 +17,13 @@ Page({
     monthRecords: [],
     historyList: [],
     showDayDetail: false,
-    dayDetail: {}
+    dayDetail: {},
+    icons: iconsMod.build()
   },
 
   onLoad() {
     themeMod.applyThemeToPage(this)
-    this.refresh()
+    this._firstShow = true
   },
 
   onShow() {
@@ -30,6 +32,11 @@ Page({
       const tb = this.getTabBar()
       if (tb) tb.setData({ selected: 1 })
     } catch (e) {}
+    if (this._firstShow) {
+      this._firstShow = false
+      this.refresh()
+      return
+    }
     this.refresh()
   },
 
@@ -39,21 +46,35 @@ Page({
   },
 
   refresh() {
+    storage.validateStreak()
     const stats = storage.getTotalStats()
     const monthKey = `${this.data.currentYear}-${String(this.data.currentMonth).padStart(2, '0')}`
     const records = storage.getRecordsByMonth(monthKey)
 
-    const allRecords = Object.values(storage.getRecords()).flat()
-    allRecords.sort((a, b) => b.date.localeCompare(a.date))
+    // Each month is already sorted newest-first in storage. To get top 30 most recent,
+    // walk months in reverse chrono order and concat — O(months*30) instead of O(n log n).
+    const byMonth = storage.getRecords()
+    const monthKeys = Object.keys(byMonth).sort().reverse()
+    const historyList = []
+    for (const mk of monthKeys) {
+      for (const r of byMonth[mk]) {
+        historyList.push(r)
+        if (historyList.length >= 30) break
+      }
+      if (historyList.length >= 30) break
+    }
 
+    const theme = themeMod.getCurrentTheme()
     this.setData({
+      theme,
+      icons: iconsMod.build(theme),
       totalDuration: stats.totalDuration,
       totalDurationText: util.formatDuration(stats.totalDuration),
       totalSessions: stats.totalSessions,
       maxDuration: stats.maxDuration,
       maxDurationText: util.formatDuration(stats.maxDuration),
       monthRecords: records,
-      historyList: allRecords.slice(0, 30)
+      historyList
     })
   },
 
@@ -84,12 +105,10 @@ Page({
   onDayTap(e) {
     const { year, month, day } = e.detail
     const dateStr = `${year}-${String(month).padStart(2, '0')}-${String(day).padStart(2, '0')}`
-
     const allRecords = Object.values(storage.getRecords()).flat()
     const sessions = allRecords.filter(r => r.date === dateStr)
     const totalDur = sessions.reduce((sum, r) => sum + r.duration, 0)
     const calories = Math.round(totalDur * 0.068)
-
     this.setData({
       showDayDetail: true,
       dayDetail: {
@@ -106,10 +125,31 @@ Page({
     this.setData({ showDayDetail: false })
   },
 
-  noop() {},
+  onLongPressDelete(e) {
+    const id = e.currentTarget.dataset.id
+    if (!id && id !== 0) {
+      wx.showToast({ title: '记录数据异常', icon: 'none', duration: 1200 })
+      return
+    }
+    wx.showModal({
+      title: '删除记录',
+      content: '确定要删除这条训练记录吗？',
+      success: (res) => {
+        if (res.confirm) {
+          storage.deleteRecord(id)
+          this.refresh()
+          wx.showToast({ title: '已删除', icon: 'none', duration: 1200 })
+        }
+      }
+    })
+  },
 
   onDeleteRecord(e) {
     const id = e.currentTarget.dataset.id
+    if (!id && id !== 0) {
+      wx.showToast({ title: '记录数据异常', icon: 'none', duration: 1200 })
+      return
+    }
     wx.showModal({
       title: '删除记录',
       content: '确定要删除这条训练记录吗？',