feat(ui): 记录页月份联动与多项 UI 美化/修复

- records: 底部列表与月份选择器联动，新增 [本月|最近] 分段控件；标题/空态随模式切换
- leaderboard: 领奖台布局(冠军居中+皇冠)、次数标注于底座且三档水平对齐；头像 cloud:// 批量预解析提速(云函数需重新部署)
- index/timer: 主色底图标改白色变体修复隐形；目标数字按微信字体缩放补偿真机遮挡
- settings: 配色方案横滑渐变色卡；头像上传前压缩至 200px
- theme: 新增 teal 主题；暗黑背景统一对齐
- 圆形头像双保险(image 自身 border-radius)修复月/年榜方图

注: cloudfunctions/leaderboard 改动须在开发者工具重新部署才生效。

pages/settings/settings.wxss

@@ -14,7 +14,64 @@
   margin-bottom: 0;
 }
 
-/* ---- theme picker ---- */
+/* ---- theme picker: horizontal gradient swatch cards ---- */
+.theme-cards {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 20rpx;
+  padding-top: 8rpx;
+}
+
+.theme-card {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  width: calc((100% - 40rpx) / 3);
+  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
+}
+
+.theme-card:active {
+  transform: scale(0.94);
+}
+
+.theme-card-swatch {
+  width: 100%;
+  height: 96rpx;
+  border-radius: 20rpx;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  box-shadow: 0 4rpx 12rpx rgba(0, 0, 0, 0.10);
+  border: 4rpx solid transparent;
+  box-sizing: border-box;
+  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
+}
+
+.theme-card.active .theme-card-swatch {
+  border-color: var(--card-bg);
+  box-shadow: 0 0 0 4rpx var(--primary), 0 6rpx 16rpx rgba(var(--primary-rgb), 0.35);
+  transform: scale(1.04);
+}
+
+.theme-card-check {
+  width: 40rpx;
+  height: 40rpx;
+  filter: drop-shadow(0 2rpx 4rpx rgba(0, 0, 0, 0.25));
+}
+
+.theme-card-name {
+  font-size: 24rpx;
+  color: var(--text-secondary);
+  margin-top: 12rpx;
+  line-height: 1;
+}
+
+.theme-card-name.active {
+  color: var(--primary);
+  font-weight: 600;
+}
+
+/* ---- dark-mode & plan list (row-style pickers, e.g. 深色模式) ---- */
 .theme-list { margin-top: 0; }
 
 .theme-item {
@@ -40,20 +97,6 @@
   border-top: 1rpx solid transparent;
 }
 
-.theme-color-dot {
-  width: 44rpx;
-  height: 44rpx;
-  border-radius: 50%;
-  margin-right: 20rpx;
-  flex-shrink: 0;
-  box-shadow: 0 2rpx 10rpx rgba(0, 0, 0, 0.15);
-  transition: transform 0.2s ease;
-}
-
-.theme-item:active .theme-color-dot {
-  transform: scale(1.15);
-}
-
 .theme-name {
   flex: 1;
   font-size: 28rpx;
@@ -78,6 +121,10 @@
 
 .plan-item:last-child { border-bottom: none; }
 
+.plan-item {
+  position: relative;
+}
+
 .plan-item.active {
   background: rgba(var(--primary-rgb), 0.12);
   margin: 0 -32rpx;
@@ -87,6 +134,19 @@
   border-bottom: none;
 }
 
+/* left accent bar on the active plan, making the selection scan-able */
+.plan-item.active::before {
+  content: '';
+  position: absolute;
+  left: 0;
+  top: 50%;
+  transform: translateY(-50%);
+  width: 6rpx;
+  height: 48rpx;
+  border-radius: 3rpx;
+  background: linear-gradient(180deg, var(--primary), var(--primary-light));
+}
+
 .plan-radio {
   width: 40rpx;
   height: 40rpx;
@@ -283,6 +343,11 @@
   box-sizing: border-box;
 }
 
+/* 真实头像(正方形)用 aspectFill 填满圆形容器,去掉占位图的内缩 padding */
+.avatar-img.has-avatar {
+  padding: 0;
+}
+
 .avatar-overlay {
   position: absolute;
   bottom: 0;