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.wxss

@@ -2,7 +2,7 @@
   display: flex;
   justify-content: space-around;
   text-align: center;
-  padding: 32rpx 16rpx;
+  padding: 8rpx 0;
 }
 
 .stat-item {
@@ -12,13 +12,10 @@
   flex: 1;
 }
 
-.stat-emoji {
-  font-size: 28rpx;
-  width: 56rpx;
+.stat-icon {
+  width: 40rpx;
   height: 40rpx;
-  line-height: 40rpx;
-  text-align: center;
-  margin-bottom: 4rpx;
+  margin-bottom: 8rpx;
 }
 
 .stat-num {
@@ -38,7 +35,7 @@
 
 /* ---- calendar ---- */
 .calendar-section {
-  padding: 24rpx 24rpx 28rpx;
+  padding: 0;
 }
 
 .month-picker {
@@ -54,8 +51,9 @@
   gap: 10rpx;
 }
 
-.month-emoji {
-  font-size: 28rpx;
+.month-icon {
+  width: 32rpx;
+  height: 32rpx;
 }
 
 .month-title {
@@ -65,18 +63,27 @@
 }
 
 .month-arrow {
-  font-size: 44rpx;
-  color: var(--primary);
-  padding: 0 20rpx;
-  font-weight: 300;
-  transition: opacity 0.15s;
+  padding: 16rpx 20rpx;
+  display: flex;
+  align-items: center;
+  justify-content: center;
 }
 
 .month-arrow:active {
   opacity: 0.5;
 }
 
+.month-arrow-img {
+  width: 32rpx;
+  height: 32rpx;
+  color: var(--primary);
+}
+
 /* ---- history ---- */
+.history-section {
+  padding: 0;
+}
+
 .history-header {
   display: flex;
   justify-content: space-between;
@@ -84,6 +91,17 @@
   margin-bottom: 8rpx;
 }
 
+.history-title-wrap {
+  display: flex;
+  align-items: center;
+  gap: 8rpx;
+}
+
+.history-title-icon {
+  width: 28rpx;
+  height: 28rpx;
+}
+
 .history-header .section-title {
   margin-bottom: 0;
 }
@@ -100,8 +118,9 @@
   padding: 60rpx 0;
 }
 
-.empty-emoji {
-  font-size: 64rpx;
+.empty-icon {
+  width: 80rpx;
+  height: 80rpx;
   margin-bottom: 16rpx;
   animation: float 3s ease-in-out infinite;
 }
@@ -129,8 +148,13 @@
   animation: cardIn 0.35s ease both;
 }
 
-.history-item:last-child {
-  border-bottom: none;
+.history-item:last-child { border-bottom: none; }
+
+.history-item-icon {
+  width: 36rpx;
+  height: 36rpx;
+  margin-right: 16rpx;
+  flex-shrink: 0;
 }
 
 .history-left {
@@ -153,35 +177,62 @@
 .history-right {
   display: flex;
   align-items: center;
+  gap: 12rpx;
+  flex-shrink: 0;
 }
 
 .history-duration {
   font-size: 32rpx;
   font-weight: 600;
   color: var(--primary);
+  margin-right: 4rpx;
+}
+
+.history-delete-btn {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 6rpx;
+  padding: 0 18rpx;
+  height: 56rpx;
+  background: rgba(229, 57, 53, 0.1);
+  border: 2rpx solid rgba(229, 57, 53, 0.2);
+  border-radius: 28rpx;
+  flex-shrink: 0;
+  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
+}
+
+.history-delete-btn:active {
+  transform: scale(0.92);
+  background: rgba(229, 57, 53, 0.2);
+  border-color: rgba(229, 57, 53, 0.4);
+}
+
+.history-delete-icon {
+  width: 28rpx;
+  height: 28rpx;
+  flex-shrink: 0;
+}
+
+.history-delete-text {
+  font-size: 24rpx;
+  color: #E53935;
+  font-weight: 600;
+  line-height: 1;
 }
 
 /* ---- day detail popup ---- */
-.day-detail-modal {
-  width: 560rpx;
-  background: #fff;
-  border-radius: 28rpx;
-  padding: 48rpx 40rpx 36rpx;
-  animation: popIn 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
-  text-align: center;
-}
-
 .detail-date-row {
   display: flex;
   align-items: center;
   justify-content: center;
   margin-bottom: 36rpx;
+  gap: 10rpx;
 }
 
-.detail-emoji {
-  font-size: 32rpx;
-  margin-right: 10rpx;
-  line-height: 1;
+.detail-icon {
+  width: 36rpx;
+  height: 36rpx;
 }
 
 .detail-date {
@@ -202,6 +253,12 @@
   align-items: center;
 }
 
+.detail-item-icon {
+  width: 36rpx;
+  height: 36rpx;
+  margin-bottom: 8rpx;
+}
+
 .detail-num {
   font-size: 36rpx;
   font-weight: 700;
@@ -220,10 +277,3 @@
   color: var(--text-secondary);
   border-top: 1rpx solid var(--border);
 }
-
-.history-icon {
-  font-size: 28rpx;
-  margin-right: 16rpx;
-  flex-shrink: 0;
-  line-height: 1;
-}