fix(web-admin): stick category header tools with MpBusinessHeader.

Move expand-all and add into a header actions slot so they remain visible while scrolling.

Co-authored-by: Cursor <cursoragent@cursor.com>

web-admin/src/components/mp/MpBusinessHeader.vue

@@ -0,0 +1,61 @@
+<template>
+  <header class="mp-wv-header">
+    <div class="mp-wv-header__row">
+      <button
+        class="mp-wv-header__back mp-wv-touch-target"
+        type="button"
+        :aria-label="backLabel"
+        @click="emit('back')"
+      >
+        ←
+      </button>
+      <h1 class="mp-wv-header__title">{{ title }}</h1>
+      <div v-if="$slots.actions" class="mp-wv-header__actions">
+        <slot name="actions" />
+      </div>
+    </div>
+    <slot name="before-search" />
+    <input
+      v-if="searchable"
+      class="mp-wv-search mp-wv-touch-target"
+      type="search"
+      :value="keyword"
+      :aria-label="searchLabel"
+      :placeholder="searchPlaceholder"
+      autocomplete="off"
+      @input="updateKeyword"
+      @keyup.enter="emit('search')"
+    />
+    <slot name="after-search" />
+  </header>
+</template>
+
+<script setup lang="ts">
+  withDefaults(
+    defineProps<{
+      title: string
+      backLabel?: string
+      searchable?: boolean
+      keyword?: string
+      searchPlaceholder?: string
+      searchLabel?: string
+    }>(),
+    {
+      backLabel: '返回',
+      searchable: false,
+      keyword: '',
+      searchPlaceholder: '搜索',
+      searchLabel: '搜索'
+    }
+  )
+
+  const emit = defineEmits<{
+    back: []
+    search: []
+    'update:keyword': [value: string]
+  }>()
+
+  function updateKeyword(event: Event) {
+    emit('update:keyword', (event.target as HTMLInputElement).value)
+  }
+</script>