feat: 开发完成拼音每日一练

miniprogram/pinyinPages/pinyinDictation/pinyinDictation.wxml

@@ -4,12 +4,34 @@
     <view class="pd-main">
         <preview-card
             id="previewCard"
-            showRefresh="{{false}}"
+            showRefresh="{{true}}"
             showFavorite="{{true}}"
             favorited="{{isPreviewFavorite}}"
             bind:canvas-ready="onCanvasReady"
+            bind:refresh="onPreviewRefresh"
             bind:favorite="onPreviewFavorite" />
 
+        <!-- 选择练习组（拼音每日一练模式） -->
+        <view wx:if="{{showDailyGroupPicker}}" class="pd-section">
+            <text class="pd-section-title">选择练习组</text>
+            <view class="pd-chip-row pd-chip-row--wrap pd-chip-row--triple">
+                <view
+                    wx:for="{{dailyGroups}}"
+                    wx:key="index"
+                    class="pd-chip {{selectedDailyGroupIdx === item.index ? 'pd-chip--active' : ''}}"
+                    hover-class="pd-chip--pressed"
+                    hover-start-time="0"
+                    hover-stay-time="70"
+                    data-idx="{{item.index}}"
+                    bind:tap="onSelectDailyGroup">
+                    <view class="pd-chip__text">
+                        <text class="pd-chip__label">{{item.label}}</text>
+                        <text class="pd-chip__subtitle">{{item.subtitle}}</text>
+                    </view>
+                </view>
+            </view>
+        </view>
+
         <!-- 练习类型切换（描红 / 默写） -->
         <view class="pd-section">
             <text class="pd-section-title">练习类型</text>