feat: 新增抱团组件和申请助手弹窗组件

新增huddle-box和helper-pop组件，包含相关图片资源和样式调整
修复item-mj组件中itemBottom导入错误
优化移动端样式适配
更新sectionV2页面引入新组件
补充公共样式和动画效果

component/huddle-box/huddle-box.js

@@ -0,0 +1,30 @@
+// my-component.js
+// 引入全局 Vue 对象（因在 HTML 中通过 script 引入，Vue 已挂载到 window）
+const { defineComponent, ref, inject, defineAsyncComponent, onMounted } = Vue;
+
+// 定义组件（直接使用模板）
+export const huddleBox = defineComponent({
+    name: "item-bottom",
+    props: {},
+
+    setup(props) {
+        let isMobile = ref(false);
+
+        let state = ref(false);
+
+        onMounted(() => {
+            isMobile.value = window.isMobile;
+        });
+
+        const open = () => (state.value = true);
+        const closeGroup = () => (state.value = false);
+
+        const holdback = () => {};
+
+        return { state, isMobile, holdback, closeGroup, open };
+    },
+
+    components: {},
+
+    template: `<div class="huddle-box" @click="closeGroup" v-if="state">    <div class="box flexflex" @click.stop="holdback">        <img class="bj" src="../../img/group-bj.svg" alt="">        <img class="bj-bottom" src="../../img/group-bottom.png" alt="">        <img class="top" src="../../img/group-top.png" alt="">        <img class="title" src="../../img/group-title.png" alt="">        <div class="text">抱团 / 信息共享 / 互助申学</div>        <div class="case flexflex">            <div class="QRcode flexcenter">                <img class="img" src="https://o.x-php.com/Zvt57TuJSUvkyhw-xG7Y2l-c-5kpcnzqqsgFptxhcq_cQnrlJKN1WgxCBq_D-81qNDQyOQ~~" alt="">            </div>            <div class="hint flexcenter">                <img class="img img-left" src="../../img/group-arrows.png" alt="">                <span class="hint-text">添加寄托葱哥进群</span>                <img class="img" src="../../img/group-arrows.png" alt="">            </div>         </div>    </div> </div>`,
+});