feat(h5): 首页默认展示全部大类的材料种类，未选中时分组列出

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend-h5/src/views/Home.vue

@@ -1,5 +1,5 @@
 <script setup>
-import { ref, onMounted, watch } from 'vue'
+import { ref, onMounted, computed, watch } from 'vue'
 import { useRouter } from 'vue-router'
 import MajorCategoryCard from '@/components/MajorCategoryCard.vue'
 import CategoryCard from '@/components/CategoryCard.vue'
@@ -21,14 +21,17 @@ const majors = [
 ]
 
 const selected = ref(ui.selectedMajor)
-const categories = ref([])
+const categoriesByMajor = ref({})
 const loading = ref(false)
 
-const loadCategories = async (major) => {
-  if (!major) { categories.value = []; return }
+const loadAll = async () => {
   loading.value = true
-  try { categories.value = await fetchCategoriesByMajor(major) }
-  finally { loading.value = false }
+  try {
+    const results = await Promise.all(majors.map((m) => fetchCategoriesByMajor(m.value)))
+    const map = {}
+    majors.forEach((m, i) => { map[m.value] = results[i] })
+    categoriesByMajor.value = map
+  } finally { loading.value = false }
 }
 
 const onSelect = (v) => {
@@ -36,13 +39,25 @@ const onSelect = (v) => {
   ui.setMajor(selected.value)
 }
 
-watch(selected, loadCategories, { immediate: true })
+const visibleGroups = computed(() => {
+  if (selected.value) {
+    return [{ major: majors.find((m) => m.value === selected.value), categories: categoriesByMajor.value[selected.value] || [] }]
+  }
+  return majors.map((m) => ({ major: m, categories: categoriesByMajor.value[m.value] || [] }))
+})
+
+watch(selected, (v) => {
+  if (v && !categoriesByMajor.value[v]) {
+    fetchCategoriesByMajor(v).then((r) => { categoriesByMajor.value = { ...categoriesByMajor.value, [v]: r } })
+  }
+})
 
 onMounted(async () => {
   if (!auth.user) { try { await auth.loadUser() } catch {} }
+  await loadAll()
 })
 
-const goCategory = (c) => router.push({ name: 'CategoryDetail', params: { major: selected.value, category: c.value } })
+const goCategory = (major, c) => router.push({ name: 'CategoryDetail', params: { major, category: c.value } })
 const onLogout = () => { auth.logout(); router.replace('/login') }
 </script>
 
@@ -59,20 +74,24 @@ const onLogout = () => { auth.logout(); router.replace('/login') }
         @click="onSelect(m.value)" />
     </section>
 
-    <section class="px-4 pb-6">
-      <transition name="fade">
-        <div v-if="selected">
-          <div class="text-xs text-muted mb-2">细分种类</div>
-          <div v-if="loading" class="grid grid-cols-2 gap-3">
-            <Skeleton v-for="n in 4" :key="n" class="h-14" />
+    <section class="px-4 pb-6 space-y-5">
+      <div v-if="loading && !Object.keys(categoriesByMajor).length" class="grid grid-cols-2 gap-3">
+        <Skeleton v-for="n in 6" :key="n" class="h-14" />
+      </div>
+
+      <template v-else>
+        <div v-for="g in visibleGroups" :key="g.major.value">
+          <div class="flex items-center justify-between mb-2">
+            <div class="text-xs text-muted">{{ g.major.label }} · 材料种类</div>
+            <span class="text-[11px] text-muted tnum">{{ g.categories.length }} 类</span>
           </div>
-          <div v-else-if="categories.length" class="grid grid-cols-2 gap-3">
-            <CategoryCard v-for="c in categories" :key="c.value" :value="c.value" :count="c.count" @click="goCategory(c)" />
+          <div v-if="g.categories.length" class="grid grid-cols-2 gap-3">
+            <CategoryCard v-for="c in g.categories" :key="c.value" :value="c.value" :count="c.count"
+              @click="goCategory(g.major.value, c)" />
           </div>
-          <div v-else class="py-10 text-center text-sm text-muted">该大类暂无已审核材料</div>
+          <div v-else class="py-6 text-center text-xs text-muted bg-white rounded-card">暂无已审核材料</div>
         </div>
-        <div v-else class="py-10 text-center text-sm text-muted">点击上方分类查看细分种类</div>
-      </transition>
+      </template>
     </section>
   </div>
 </template>