refactor(components): 统一组件点击事件命名规范

- 将 EventCard、FeedCard、FriendItem 组件的点击事件从 'tap' 改为 'item-click'
- 更新相关页面中的事件监听器以匹配新的事件名称
- 在聊天页面优化键盘处理逻辑，添加输入框失焦时的键盘保持功能
- 为圆圈页面添加导航防抖锁，防止页面重复打开
- 调整聊天输入框样式，增加10px缓冲避免与键盘贴合

components/EventCard.vue

@@ -1,5 +1,5 @@
 <template>
-  <view class="event-card" @click="$emit('tap', event)">
+  <view class="event-card" @click="$emit('item-click', event)">
     <!-- 状态标签 -->
     <view class="event-status" :class="'status-' + event.status">
       <text class="event-status-text">{{ statusLabel }}</text>
@@ -46,7 +46,7 @@ export default {
   props: {
     event: { type: Object, default: () => ({}) }
   },
-  emits: ['tap'],
+  emits: ['item-click'],
   computed: {
     statusLabel() {
       const map = { open: '报名中', ongoing: '进行中', ended: '已结束' }

components/FeedCard.vue

@@ -1,5 +1,5 @@
 <template>
-  <view class="feed-card" @click="$emit('tap', feed)">
+  <view class="feed-card" @click="$emit('item-click', feed)">
     <!-- 头部：头像+昵称+时间 -->
     <view class="feed-header">
       <view class="feed-avatar-wrap">
@@ -68,7 +68,7 @@ export default {
   props: {
     feed: { type: Object, default: () => ({}) }
   },
-  emits: ['tap', 'like', 'comment', 'share'],
+  emits: ['item-click', 'like', 'comment', 'share'],
   methods: {
     getCatIcon,
     isIconPath,

components/FriendItem.vue

@@ -1,5 +1,5 @@
 <template>
-  <view class="friend-item" @click="$emit('tap', friend)">
+  <view class="friend-item" @click="$emit('item-click', friend)">
     <view class="friend-avatar-wrap">
       <image v-if="friend.avatar" class="friend-avatar" :src="friend.avatar" mode="aspectFill"></image>
       <view v-else class="friend-avatar friend-avatar-ph">
@@ -21,7 +21,7 @@ export default {
   props: {
     friend: { type: Object, default: () => ({}) }
   },
-  emits: ['tap']
+  emits: ['item-click']
 }
 </script>