fix(plan-card): 计划卡片图标改用 fc-icon 渲染

- plan-card 仍用 {{plan.emoji}} 文本渲染，导致创建计划后显示 person-standing 等字面量
- 改为 require iconName 计算 icon，wxml 使用 <fc-icon> 渲染
- 同步清理 badge/emoji 的字体样式

miniprogram/components/plan-card/index.js

@@ -2,6 +2,8 @@
 // props:
 //   plan: { id|slug, emoji, color, name, description, count|exerciseCount, cover? }
 //   target: 点击跳转的完整 url
+const { iconName } = require('../../utils/icon-name.js');
+
 Component({
   properties: {
     plan: { type: Object, value: {} },
@@ -11,7 +13,8 @@ Component({
     count: 0,
     cover: '',
     hasCover: false,
-    color: '#D9B36C'
+    color: '#D9B36C',
+    icon: 'folder-open'
   },
   observers: {
     plan: function (plan) {
@@ -20,7 +23,8 @@ Component({
         count: plan.count || plan.exerciseCount || 0,
         cover: plan.cover || '',
         hasCover: !!(plan.cover),
-        color: plan.color || '#D9B36C'
+        color: plan.color || '#D9B36C',
+        icon: iconName(plan.emoji, 'folder-open')
       });
     }
   },

miniprogram/components/plan-card/index.wxml

@@ -4,10 +4,14 @@
     class="pc__cover"
     style="background: {{color}}22;">
     <image class="pc__img" src="{{cover}}" mode="aspectFill" lazy-load="true" />
-    <view class="pc__badge" style="background: {{color}}22; color: {{color}};">{{plan.emoji}}</view>
+    <view class="pc__badge" style="background: {{color}}22;">
+      <fc-icon name="{{icon}}" size="38" color="{{color}}" />
+    </view>
   </view>
   <view wx:else class="pc__top" style="background: linear-gradient(135deg, {{color}}26, var(--surface));">
-    <view class="pc__emoji" style="background: {{color}}22; color: {{color}};">{{plan.emoji}}</view>
+    <view class="pc__emoji" style="background: {{color}}22;">
+      <fc-icon name="{{icon}}" size="52" color="{{color}}" />
+    </view>
   </view>
 
   <view class="pc__body">

miniprogram/components/plan-card/index.wxss

@@ -12,13 +12,11 @@
   position: absolute; left: 16rpx; top: 16rpx;
   width: 64rpx; height: 64rpx; border-radius: 18rpx;
   display: flex; align-items: center; justify-content: center;
-  font-size: 38rpx; line-height: 1;
 }
 .pc__top { padding: 28rpx; display: flex; }
 .pc__emoji {
   width: 96rpx; height: 96rpx; border-radius: 24rpx;
   display: flex; align-items: center; justify-content: center;
-  font-size: 52rpx; line-height: 1;
 }
 .pc__body { padding: 18rpx 22rpx 8rpx; }
 .pc__name { font-size: 30rpx; font-weight: 700; }