feat(admin): smart dropdown positioning, filter & pagination fixes

- Add getDropdownPosition() to handle table dropdown placement dynamically
- Remove overflow-hidden on admin-card so dropdowns aren't clipped
- Fix totalPages calculation using total/limit instead of missing API field
- Add role/status filters + full pagination to member page
- Create .agents/admin-ui-pitfalls.md for future reference

app/pages/admin/thanh-vien.vue

@@ -66,7 +66,23 @@ async function deleteMember(member: any) {
 }
 
 const members = computed(() => data.value?.items || [])
-const totalPages = computed(() => data.value?.totalPages || 1)
+const totalPages = computed(() => {
+  const limit = 20
+  return Math.ceil((data.value?.total || 1) / limit)
+})
+
+// 3-dot menu state
+const menuOpen = ref<number | null>(null)
+
+// Helper để dropdown luôn hiển thị bên trong vùng nhìn thấy
+function getDropdownPosition(index: number) {
+  const total = members.value?.length || 0
+  // Chỉ mở lên trên khi còn ít nhất 2 hàng phía dưới
+  if (total <= 2 || index < total - 2) {
+    return 'top-full mt-1'
+  }
+  return 'bottom-full mb-1'
+}
 
 const visiblePages = computed(() => {
   const total = totalPages.value
@@ -108,7 +124,7 @@ const visiblePages = computed(() => {
       <p class="admin-section-subtitle mt-1">Quản lý tài khoản thành viên CineK ({{ data?.total || 0 }} thành viên)</p>
     </div>
 
-    <div class="admin-card overflow-hidden">
+    <div class="admin-card overflow-visible!">
       <div class="grid grid-cols-1 gap-3 border-b border-white/6 p-4
          md:grid-cols-2 xl:grid-cols-[minmax(280px,1fr)_180px_160px] xl:items-center">
         <div class="relative min-w-0 w-full">
@@ -149,17 +165,9 @@ const visiblePages = computed(() => {
             <tr v-for="member in members" :key="member.id" class="transition hover:bg-white/2">
               <td class="px-4 py-3.5 text-center text-sm font-semibold text-slate-500">{{ members.indexOf(member) + 1 }}
               </td>
-              <td class="min-w-0 px-4 py-3.5 text-center">
-                <div class="flex items-center gap-3 justify-center">
-                  <div
-                    class="grid size-9 place-items-center rounded-full bg-linear-to-br from-slate-700 to-slate-800 text-sm font-bold text-slate-300 shrink-0">
-                    {{ (member.name || member.email || '?').charAt(0).toUpperCase() }}
-                  </div>
-                  <div class="min-w-0">
-                    <p class="truncate text-sm font-bold text-white">{{ member.name || 'Chưa có tên' }}</p>
-                    <p class="truncate text-xs text-slate-400">{{ member.email }}</p>
-                  </div>
-                </div>
+              <td class="px-4 py-3.5 text-center">
+                <p class="truncate text-sm font-bold text-white">{{ member.name || 'Chưa có tên' }}</p>
+                <p class="truncate text-xs text-slate-400">{{ member.email }}</p>
               </td>
               <td class="px-4 py-3.5 text-center">
                 <select :value="member.role"
@@ -178,13 +186,31 @@ const visiblePages = computed(() => {
                 {{ new Date(member.createdAt).toLocaleDateString('vi-VN') }}
               </td>
               <td class="px-4 py-3.5 text-center">
-                <button type="button"
-                  class="grid size-8 place-items-center rounded-lg text-red-400 transition hover:bg-red-500/10"
-                  :disabled="currentUser?.id === member.id"
-                  :title="currentUser?.id === member.id ? 'Không thể xoá chính mình' : 'Xoá thành viên'"
-                  @click="deleteMember(member)">
-                  <AppIcon name="trash" class="size-4" />
-                </button>
+                <div class="relative inline-flex">
+                  <button type="button"
+                    class="grid size-9 place-items-center rounded-lg text-zinc-500 transition
+                       hover:bg-slate-100 hover:text-zinc-700" title="Thao tác"
+                    @click="menuOpen = menuOpen === member.id ? null : member.id">
+                    <AppIcon name="ellipsis-vertical" class="size-5 stroke-[2.5]" />
+                  </button>
+                  <Transition name="dropdown-fade">
+                    <div v-if="menuOpen === member.id" :class="[
+                      'absolute right-0 min-w-40 rounded-lg border border-slate-200 bg-white py-1 shadow-xl z-50',
+                      getDropdownPosition(members.indexOf(member))
+                    ]">
+                      <button type="button"
+                        v-if="currentUser?.id !== member.id"
+                        class="flex w-full items-center gap-2 px-3 py-2 text-sm text-red-500 transition hover:bg-red-50"
+                        @click="menuOpen = null; deleteMember(member)">
+                        <AppIcon name="trash" class="size-4" />
+                        Xoá thành viên
+                      </button>
+                      <div v-else class="px-3 py-2 text-xs text-slate-400">
+                        Không thể xoá chính mình
+                      </div>
+                    </div>
+                  </Transition>
+                </div>
               </td>
             </tr>
             <tr v-if="!members.length">