feat: 优化UI

pages/discover/index.wxml

@@ -58,26 +58,18 @@
           </view>
 
           <!-- 行动按钮 -->
-          <!-- 已订阅 -->
-          <view wx:if="{{item._isSubscribed}}" class="sub-btn subscribed" bindtap="onAction" data-id="{{item.id}}">
-            <t-icon name="check-circle" size="28rpx" color="#999" />
-            <text>已订阅</text>
+          <!-- 可播放（VIP / 免费 / 已订阅）→ 收听 -->
+          <view wx:if="{{item._canPlay}}" class="sub-btn free" bindtap="onAction" data-id="{{item.id}}">
+            <text>▶ 收听</text>
           </view>
 
-          <!-- 免费 → 收听 -->
-          <view wx:elif="{{item._isFree}}" class="sub-btn free" bindtap="onAction" data-id="{{item.id}}">
-            <t-icon name="play-circle" size="28rpx" color="#FFF" />
-            <text>收听</text>
-          </view>
-
-          <!-- VIP专享 -->
+          <!-- VIP专享（且非VIP用户）-->
           <view wx:elif="{{item._isVipOnly}}" class="sub-btn vip" bindtap="onAction" data-id="{{item.id}}">
             <text>👑 VIP专享</text>
           </view>
 
           <!-- 付费订阅 -->
           <view wx:else class="sub-btn paid" bindtap="onAction" data-id="{{item.id}}">
-            <t-icon name="shop" size="28rpx" color="#FFF" />
             <text>订阅</text>
           </view>
         </view>
@@ -94,7 +86,7 @@
         <text class="vip-banner-desc">立享极致畅听体验</text>
       </view>
       <view class="vip-banner-price">
-        <text>19.9元/月</text>
+        <text>{{vipPriceText || '会员价'}}</text>
       </view>
     </view>