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/index/index.js

@@ -2,6 +2,9 @@ const storage = require('../../utils/storage')
 const planMod = require('../../utils/plan')
 const util = require('../../utils/util')
 const themeMod = require('../../utils/theme')
+const iconsMod = require('../../utils/icons')
+
+const MAX_CUSTOM_DURATION = 3600  // 1 hour max
 
 Page({
   data: {
@@ -19,12 +22,13 @@ Page({
     showPicker: false,
     presets: [30, 60, 90, 120, 180, 300],
     customDuration: 60,
-    customInput: ''
+    customInput: '',
+    icons: iconsMod.build()
   },
 
   onLoad() {
     themeMod.applyThemeToPage(this)
-    this.refresh()
+    this._firstShow = true
   },
 
   onShow() {
@@ -33,6 +37,12 @@ Page({
       const tb = this.getTabBar()
       if (tb) tb.setData({ selected: 0 })
     } catch (e) {}
+    // Skip the first onShow to avoid double-refresh; subsequent tab switches still refresh.
+    if (this._firstShow) {
+      this._firstShow = false
+      this.refresh()
+      return
+    }
     this.refresh()
   },
 
@@ -43,15 +53,19 @@ Page({
 
   refresh() {
     const settings = storage.getSettings()
-    const streak = storage.getStreak()
+    const streak = storage.validateStreak()
     const todayRecord = storage.getTodayRecord()
 
     const allRecords = Object.values(storage.getRecords()).flat()
-    const plan = planMod.getPlan(settings.planId)
-    const planDay = planMod.getPlanDay(settings.planId, allRecords)
+    const customPlans = storage.getCustomPlans()
+    const plan = planMod.getPlan(settings.planId, customPlans)
+    const planDay = planMod.getPlanDay(settings.planId, allRecords, settings.planStartDate)
     const target = planMod.getTodayTarget(settings.planId, Math.min(planDay, plan.totalDays))
 
+    const theme = themeMod.getCurrentTheme()
     this.setData({
+      theme,
+      icons: iconsMod.build(theme),
       todayTarget: target,
       todayDone: todayRecord && todayRecord.duration >= target,
       todayDuration: todayRecord ? todayRecord.duration : 0,
@@ -82,7 +96,8 @@ Page({
   },
 
   onCustomInput(e) {
-    const val = parseInt(e.detail.value) || 0
+    let val = parseInt(e.detail.value) || 0
+    if (val > MAX_CUSTOM_DURATION) val = MAX_CUSTOM_DURATION
     this.setData({ customInput: e.detail.value, customDuration: val })
   },
 
@@ -92,9 +107,11 @@ Page({
       wx.showToast({ title: '请输入有效时长', icon: 'none' })
       return
     }
+    if (dur > MAX_CUSTOM_DURATION) {
+      wx.showToast({ title: '最大时长为1小时', icon: 'none' })
+      return
+    }
     this.setData({ showPicker: false })
     wx.navigateTo({ url: `/pages/timer/timer?free=${dur}` })
-  },
-
-  noop() {}
+  }
 })