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)

components/ui-modal/ui-modal.js

@@ -0,0 +1,17 @@
+Component({
+  options: { multipleSlots: true },
+  properties: {
+    visible: { type: Boolean, value: false },
+    position: { type: String, value: 'bottom' },  // 'bottom' | 'center'
+    showHandle: { type: Boolean, value: true },
+    closeOnOverlay: { type: Boolean, value: true },
+    customStyle: { type: String, value: '' }
+  },
+  methods: {
+    onClose() {
+      if (!this.data.closeOnOverlay) return
+      this.triggerEvent('close')
+    },
+    onNoop() { /* swallow bubble for inner touches */ }
+  }
+})

components/ui-modal/ui-modal.json

@@ -0,0 +1,4 @@
+{
+  "component": true,
+  "usingComponents": {}
+}

components/ui-modal/ui-modal.wxml

@@ -0,0 +1,7 @@
+<view wx:if="{{visible}}" class="ui-modal ui-modal--{{position}}" catchtouchmove="onNoop">
+  <view class="ui-modal__overlay" bindtap="onClose"></view>
+  <view class="ui-modal__body" catchtap="onNoop" style="{{customStyle}}">
+    <view wx:if="{{showHandle && position === 'bottom'}}" class="ui-modal__handle"></view>
+    <slot></slot>
+  </view>
+</view>

components/ui-modal/ui-modal.wxss

@@ -0,0 +1,61 @@
+.ui-modal {
+  position: fixed;
+  top: 0; left: 0; right: 0; bottom: 0;
+  z-index: 1000;
+}
+
+.ui-modal--bottom { display: flex; align-items: flex-end; justify-content: center; }
+.ui-modal--center { display: flex; align-items: center; justify-content: center; }
+
+.ui-modal__overlay {
+  position: absolute;
+  top: 0; left: 0; right: 0; bottom: 0;
+  background: rgba(0, 0, 0, 0.45);
+  animation: uiModalFade 0.25s ease;
+}
+
+.ui-modal__body {
+  position: relative;
+  background: #FFFFFF;
+  box-sizing: border-box;
+}
+
+.ui-modal--bottom .ui-modal__body {
+  width: 100%;
+  border-radius: 32rpx 32rpx 0 0;
+  padding: 28rpx 32rpx 40rpx;
+  padding-bottom: calc(40rpx + env(safe-area-inset-bottom));
+  animation: uiModalSlideUp 0.3s cubic-bezier(0.32, 0.72, 0, 1);
+}
+
+.ui-modal--center .ui-modal__body {
+  width: 560rpx;
+  border-radius: 28rpx;
+  padding: 48rpx 40rpx 36rpx;
+  animation: uiModalPop 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
+  text-align: center;
+}
+
+.ui-modal__handle {
+  width: 64rpx;
+  height: 8rpx;
+  background: #DDD;
+  border-radius: 4rpx;
+  margin: 0 auto 24rpx;
+}
+
+@keyframes uiModalFade {
+  from { opacity: 0; }
+  to   { opacity: 1; }
+}
+
+@keyframes uiModalSlideUp {
+  from { transform: translateY(100%); }
+  to   { transform: translateY(0); }
+}
+
+@keyframes uiModalPop {
+  from { transform: scale(0); opacity: 0; }
+  60%  { transform: scale(1.05); }
+  to   { transform: scale(1); opacity: 1; }
+}