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)

app.js

@@ -1,5 +1,6 @@
 const themeMod = require('./utils/theme')
 const cloud = require('./utils/cloud')
+const storage = require('./utils/storage')
 
 App({
   onLaunch() {
@@ -10,11 +11,14 @@ App({
     if (!settings) {
       wx.setStorageSync('user_settings', {
         planId: 'beginner',
-        dailyReminder: true,
-        reminderTime: '08:00',
         voiceGuide: true,
-        vibrate: true
+        vibrate: true,
+        planStartDate: storage.getToday()
       })
+    } else if (!settings.planStartDate) {
+      // Migrate: add planStartDate for existing users
+      settings.planStartDate = storage.getToday()
+      wx.setStorageSync('user_settings', settings)
     }
 
     const streak = wx.getStorageSync('current_streak')
@@ -24,22 +28,14 @@ App({
 
     this.globalData.theme = themeMod.getCurrentTheme()
 
-    // Sync with cloud: pull on empty local, push on empty cloud
+    // Sync with cloud: pull on empty local, push on non-empty local
     const records = wx.getStorageSync('training_records')
     if (!records || Object.keys(records).length === 0) {
       // Case 1: Fresh install — restore from cloud
       cloud.pullAll().then(cloudData => this._restoreFromCloud(cloudData))
     } else {
-      // Case 2: Has local data — check if cloud needs seeding
-      cloud.pullAll().then(cloudData => {
-        if (!cloudData) {
-          // Cloud empty: push existing local data up
-          cloud.pushAll()
-        } else {
-          // Both have data — trust local (latest) and re-push
-          cloud.pushAll()
-        }
-      })
+      // Case 2: Has local data — push to cloud (local is authoritative)
+      cloud.pushAll()
     }
   },
 
@@ -55,6 +51,9 @@ App({
       if (cloudData.streak) {
         wx.setStorageSync('current_streak', cloudData.streak)
       }
+      if (cloudData.customPlans && typeof cloudData.customPlans === 'object') {
+        wx.setStorageSync('custom_plans', cloudData.customPlans)
+      }
       if (cloudData.themeId) {
         themeMod.setTheme(cloudData.themeId)
       }