diff --git a/src/components/AIChat/input/AIChatComposer.vue b/src/components/AIChat/input/AIChatComposer.vue
index 2051ff7f..29f390ac 100644
--- a/src/components/AIChat/input/AIChatComposer.vue
+++ b/src/components/AIChat/input/AIChatComposer.vue
@@ -1,5 +1,33 @@
 <script setup lang="ts">
-import { computed, nextTick, onMounted, ref, watch } from 'vue'
+import { computed, nextTick, onBeforeUnmount, onMounted, ref, watch } from 'vue'
+import UEditor from '@nuxt/ui/components/Editor.vue'
+import AIChatMentionMenu from './AIChatMentionMenu.vue'
+
+interface EditorNode {
+  type?: string
+  text?: string
+  attrs?: Record<string, unknown>
+  content?: EditorNode[]
+}
+
+interface MentionMenuItem {
+  id: string
+  label: string
+  avatar?: string | null
+  searchText?: string
+}
+
+type MentionTab = 'contact' | 'group'
+
+interface EditorInstance {
+  editor?: {
+    commands: {
+      focus: (position?: 'start' | 'end') => boolean
+      insertContent: (content: string) => boolean
+    }
+    setEditable: (editable: boolean, emitUpdate?: boolean) => void
+  }
+}
 
 const props = withDefaults(
   defineProps<{
@@ -9,70 +37,226 @@ const props = withDefaults(
     placeholder: string
     sendButtonTitle: string
     activeSkillName?: string | null
+    mentionItems?: MentionMenuItem[]
+    mentionSearchTerm?: string
+    asyncMentionSearch?: boolean
+    showMentionTabs?: boolean
+    mentionTab?: MentionTab
+    contactTabLabel?: string
+    groupTabLabel?: string
     embedded?: boolean
   }>(),
   {
     disabled: false,
     status: 'ready',
     activeSkillName: null,
+    mentionItems: () => [],
+    mentionSearchTerm: '',
+    asyncMentionSearch: false,
+    showMentionTabs: false,
+    mentionTab: 'contact',
+    contactTabLabel: '',
+    groupTabLabel: '',
     embedded: false,
   }
 )
 
 const emit = defineEmits<{
   'update:modelValue': [value: string]
+  'update:mentionSearchTerm': [value: string]
+  'update:mentionTab': [value: MentionTab]
+  mentionsChange: [ids: string[]]
   submit: []
   stop: []
   keydown: [event: KeyboardEvent]
-  cursorChange: []
   compositionStart: []
   compositionEnd: []
 }>()
 
-const textareaRef = ref<HTMLTextAreaElement | null>(null)
+const editorRef = ref<EditorInstance | null>(null)
+const editorDocument = ref<EditorNode>(createTextDocument(props.modelValue))
+let mentionNodeCount = 0
+let mentionMenuHost: HTMLElement | null = null
+let hasMentionMenuKeyboardSelection = false
 const canSubmit = computed(() => props.modelValue.trim().length > 0 && !props.disabled)
 
-function syncHeight() {
-  const textarea = textareaRef.value
-  if (!textarea) return
-
-  textarea.style.height = 'auto'
-  const maxHeight = 192
-  textarea.style.height = `${Math.min(textarea.scrollHeight, maxHeight)}px`
-  textarea.style.overflowY = textarea.scrollHeight > maxHeight ? 'auto' : 'hidden'
+const editorProps = {
+  handleKeyDown: (_view: unknown, event: KeyboardEvent) => {
+    emit('keydown', event)
+    return event.defaultPrevented
+  },
+  handleDOMEvents: {
+    compositionstart: () => {
+      emit('compositionStart')
+      return false
+    },
+    compositionend: () => {
+      emit('compositionEnd')
+      return false
+    },
+  },
 }
 
-function focus() {
-  textareaRef.value?.focus()
+const starterKit = {
+  blockquote: false as const,
+  bold: false as const,
+  bulletList: false as const,
+  code: false as const,
+  codeBlock: false as const,
+  heading: false as const,
+  italic: false as const,
+  link: false as const,
+  listItem: false as const,
+  orderedList: false as const,
+  strike: false as const,
+  underline: false as const,
 }
 
-function getSelection() {
-  const fallback = props.modelValue.length
+const mentionOptions = {
+  HTMLAttributes: {
+    class: 'ai-chat-mention',
+  },
+  deleteTriggerWithBackspace: true,
+}
+
+function createTextDocument(value: string): EditorNode {
+  const lines = value.split('\n')
   return {
-    start: textareaRef.value?.selectionStart ?? fallback,
-    end: textareaRef.value?.selectionEnd ?? fallback,
+    type: 'doc',
+    content: lines.map((line) => ({
+      type: 'paragraph',
+      content: line ? [{ type: 'text', text: line }] : undefined,
+    })),
   }
 }
 
-function setSelectionRange(start: number, end: number) {
-  textareaRef.value?.setSelectionRange(start, end)
+function getMentionText(node: EditorNode): string {
+  const id = typeof node.attrs?.id === 'string' ? node.attrs.id : ''
+  const label = typeof node.attrs?.label === 'string' ? node.attrs.label : id
+  return `@${label}`
 }
 
-function updateValue(event: Event) {
-  emit('update:modelValue', (event.target as HTMLTextAreaElement).value)
+function nodeToText(node: EditorNode): string {
+  if (node.type === 'text') return node.text ?? ''
+  if (node.type === 'mention') return getMentionText(node)
+  if (node.type === 'hardBreak') return '\n'
+
+  const content = node.content ?? []
+  const separator = node.type === 'doc' ? '\n' : ''
+  return content.map(nodeToText).join(separator)
 }
 
+function collectMentionIds(node: EditorNode, result: string[] = []): string[] {
+  if (node.type === 'mention' && typeof node.attrs?.id === 'string') {
+    result.push(node.attrs.id)
+  }
+  node.content?.forEach((child) => collectMentionIds(child, result))
+  return result
+}
+
+function handleDocumentUpdate(document: EditorNode) {
+  editorDocument.value = document
+  const mentionIds = collectMentionIds(document)
+  const insertedMention = mentionIds.length > mentionNodeCount
+  mentionNodeCount = mentionIds.length
+  emit('update:modelValue', nodeToText(document))
+  emit('mentionsChange', [...new Set(mentionIds)])
+
+  if (insertedMention) {
+    nextTick(() => editorRef.value?.editor?.commands.insertContent(' '))
+  }
+}
+
+function focus(position: 'start' | 'end' = 'end') {
+  editorRef.value?.editor?.commands.focus(position)
+}
+
+function setText(value: string) {
+  mentionNodeCount = 0
+  editorDocument.value = createTextDocument(value)
+}
+
+function clear() {
+  setText('')
+}
+
+function syncHeight() {
+  // The contenteditable surface grows through CSS and scrolls after reaching its max height.
+}
+
+function preventHoverSelection(event: Event) {
+  if (event.target instanceof Element && event.target.closest('[role="option"]')) {
+    event.stopPropagation()
+  }
+}
+
+function activateMentionMenuKeyboardSelection() {
+  hasMentionMenuKeyboardSelection = true
+  mentionMenuHost?.classList.add('has-keyboard-selection')
+}
+
+function handleMentionMenuKeydown(event: KeyboardEvent) {
+  if (!mentionMenuHost?.firstElementChild) return
+
+  if (!hasMentionMenuKeyboardSelection && event.key === 'ArrowDown') {
+    activateMentionMenuKeyboardSelection()
+    event.preventDefault()
+    event.stopImmediatePropagation()
+    return
+  }
+
+  if (!hasMentionMenuKeyboardSelection && event.key === 'ArrowUp') {
+    activateMentionMenuKeyboardSelection()
+    return
+  }
+
+  if (!hasMentionMenuKeyboardSelection && (event.key === 'Enter' || event.key === 'Tab')) {
+    event.preventDefault()
+    event.stopImmediatePropagation()
+  }
+}
+
+function getMentionMenuContainer() {
+  hasMentionMenuKeyboardSelection = false
+  mentionMenuHost?.classList.remove('has-keyboard-selection')
+
+  if (!mentionMenuHost) {
+    mentionMenuHost = document.createElement('div')
+    mentionMenuHost.className = 'ai-chat-mention-menu-host'
+    mentionMenuHost.addEventListener('mouseenter', preventHoverSelection, true)
+    document.body.appendChild(mentionMenuHost)
+  }
+  return mentionMenuHost
+}
+
+onMounted(() => {
+  document.addEventListener('keydown', handleMentionMenuKeydown, true)
+})
+
+onBeforeUnmount(() => {
+  document.removeEventListener('keydown', handleMentionMenuKeydown, true)
+  mentionMenuHost?.remove()
+  mentionMenuHost = null
+})
+
 watch(
   () => props.modelValue,
-  async () => {
-    await nextTick()
-    syncHeight()
+  (value) => {
+    if (nodeToText(editorDocument.value) !== value) {
+      setText(value)
+    }
   }
 )
 
-onMounted(() => void nextTick(syncHeight))
+watch(
+  () => props.disabled,
+  (disabled) => {
+    // Nuxt UI Editor 4.9 does not forward later editable prop changes to the existing Tiptap instance.
+    editorRef.value?.editor?.setEditable(!disabled, false)
+  }
+)
 
-defineExpose({ focus, getSelection, setSelectionRange, syncHeight })
+defineExpose({ focus, setText, clear, syncHeight })
 </script>
 
 <template>
@@ -97,21 +281,37 @@ defineExpose({ focus, getSelection, setSelectionRange, syncHeight })
           <span class="truncate">/{{ activeSkillName }}</span>
         </div>
 
-        <textarea
-          ref="textareaRef"
-          :value="modelValue"
-          rows="2"
-          class="min-h-[48px] min-w-0 flex-1 resize-none border-0 bg-transparent px-0 py-0 text-sm leading-6 text-gray-900 outline-none placeholder:text-gray-400 disabled:cursor-not-allowed disabled:text-gray-400 dark:text-gray-100 dark:placeholder:text-gray-500 dark:disabled:text-gray-500"
-          :disabled="disabled"
+        <UEditor
+          ref="editorRef"
+          :model-value="editorDocument"
+          content-type="json"
+          class="ai-chat-editor min-w-0 flex-1"
+          :editable="!disabled"
           :placeholder="placeholder"
-          @input="updateValue"
-          @keydown="emit('keydown', $event)"
-          @click="emit('cursorChange')"
-          @keyup="emit('cursorChange')"
-          @select="emit('cursorChange')"
-          @compositionstart="emit('compositionStart')"
-          @compositionend="emit('compositionEnd')"
-        />
+          :starter-kit="starterKit"
+          :mention="mentionOptions"
+          :image="false"
+          :editor-props="editorProps"
+          @update:model-value="handleDocumentUpdate"
+        >
+          <template #default="{ editor }">
+            <AIChatMentionMenu
+              :search-term="props.mentionSearchTerm"
+              :editor="editor"
+              :items="mentionItems"
+              :filter-fields="['label', 'searchText']"
+              :ignore-filter="asyncMentionSearch"
+              :limit="100"
+              :append-to="getMentionMenuContainer"
+              :show-tabs="showMentionTabs"
+              :active-tab="mentionTab"
+              :contact-tab-label="contactTabLabel"
+              :group-tab-label="groupTabLabel"
+              @update:search-term="emit('update:mentionSearchTerm', $event)"
+              @update:active-tab="emit('update:mentionTab', $event)"
+            />
+          </template>
+        </UEditor>
       </div>
 
       <button
@@ -141,3 +341,147 @@ defineExpose({ focus, getSelection, setSelectionRange, syncHeight })
     </div>
   </div>
 </template>
+
+<style scoped>
+.ai-chat-editor :deep(.tiptap) {
+  min-height: 48px;
+  max-height: 192px;
+  overflow-y: auto;
+  border: 0;
+  padding: 0;
+  color: var(--color-gray-900);
+  font-size: 0.875rem;
+  line-height: 1.5rem;
+  outline: none;
+}
+
+.ai-chat-editor :deep(.tiptap p) {
+  margin: 0;
+}
+
+.ai-chat-editor :deep(.tiptap .ai-chat-mention) {
+  display: inline-flex;
+  align-items: center;
+  border-radius: 0.375rem;
+  background: color-mix(in srgb, var(--color-primary-500) 12%, transparent);
+  padding: 0 0.25rem;
+  color: var(--color-primary-700);
+  line-height: 1.25rem;
+  white-space: nowrap;
+}
+
+.ai-chat-editor :deep(.tiptap p.is-editor-empty:first-child::before) {
+  color: var(--color-gray-400);
+}
+
+.dark .ai-chat-editor :deep(.tiptap) {
+  color: var(--color-gray-100);
+}
+
+.dark .ai-chat-editor :deep(.tiptap .ai-chat-mention) {
+  background: color-mix(in srgb, var(--color-primary-500) 16%, transparent);
+  color: var(--color-primary-400);
+}
+
+.dark .ai-chat-editor :deep(.tiptap p.is-editor-empty:first-child::before) {
+  color: var(--color-gray-500);
+}
+</style>
+
+<style>
+.ai-chat-mention-menu-host > div {
+  width: 16rem !important;
+  max-width: calc(100vw - 2rem);
+  opacity: 0;
+  visibility: hidden;
+}
+
+.ai-chat-mention-menu-host > div[style*='transform: translate'] {
+  visibility: visible;
+  animation: ai-chat-mention-menu-reveal 0s 40ms forwards;
+}
+
+@keyframes ai-chat-mention-menu-reveal {
+  to {
+    opacity: 1;
+  }
+}
+
+.ai-chat-mention-menu-host [role='listbox'] {
+  box-sizing: border-box;
+  width: 16rem;
+  min-width: 0;
+  max-width: calc(100vw - 2rem);
+  max-height: 16rem;
+  padding: 0.25rem;
+  overflow: hidden;
+  background: var(--ui-bg);
+  border: 1px solid var(--ui-border);
+  border-radius: 0.75rem;
+  box-shadow: 0 12px 32px rgb(0 0 0 / 16%);
+}
+
+.ai-chat-mention-menu-host [role='presentation'] {
+  overflow-y: auto;
+  scrollbar-width: thin;
+}
+
+.ai-chat-mention-menu-host [role='group'] {
+  padding: 0;
+}
+
+.ai-chat-mention-menu-host [role='option'] {
+  min-height: 2.25rem;
+  align-items: center;
+  gap: 0.375rem;
+  padding: 0.25rem 0.5rem;
+  border-radius: 0.5rem;
+}
+
+.ai-chat-mention-menu-host [role='option']::before {
+  inset: 0;
+  border-radius: 0.5rem;
+}
+
+.ai-chat-mention-menu-host.has-keyboard-selection [role='option'][data-highlighted]::before {
+  background: color-mix(in srgb, var(--ui-primary) 10%, transparent);
+}
+
+.ai-chat-mention-menu-host [role='option']:hover::before {
+  background: color-mix(in srgb, var(--ui-primary) 6%, transparent);
+}
+
+.ai-chat-mention-tabs {
+  padding: 0.25rem 0.25rem 0.375rem;
+  background: var(--ui-bg);
+}
+
+.ai-chat-mention-tabs__inner {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 0.125rem;
+  padding: 0.125rem;
+  background: var(--ui-bg-muted);
+  border-radius: 0.5rem;
+}
+
+.ai-chat-mention-tabs__button {
+  height: 1.625rem;
+  padding: 0 0.5rem;
+  color: var(--ui-text-muted);
+  font-size: 0.75rem;
+  line-height: 1rem;
+  cursor: pointer;
+  border-radius: 0.375rem;
+}
+
+.ai-chat-mention-tabs__button:hover {
+  color: var(--ui-text-highlighted);
+}
+
+.ai-chat-mention-tabs__button.is-active {
+  color: var(--ui-text-highlighted);
+  background: var(--ui-bg);
+  box-shadow: 0 1px 2px rgb(0 0 0 / 8%);
+}
+</style>
diff --git a/src/components/AIChat/input/AIChatInput.vue b/src/components/AIChat/input/AIChatInput.vue
index 3c705c49..8b489939 100644
--- a/src/components/AIChat/input/AIChatInput.vue
+++ b/src/components/AIChat/input/AIChatInput.vue
@@ -3,84 +3,103 @@ import { computed, nextTick, onBeforeUnmount, onMounted, ref, watch } from 'vue'
 import { storeToRefs } from 'pinia'
 import { useI18n } from 'vue-i18n'
 import AIChatComposer from './AIChatComposer.vue'
-import MemberMentionMenu from './MemberMentionMenu.vue'
 import SlashCommandMenu from './SlashCommandMenu.vue'
 import { useSkillStore, type SkillSummary } from '@/stores/skill'
+import { useSessionStore } from '@/stores/session'
 import type { MentionedMemberContext } from '@/composables/useAIChat'
 import type { MemberWithStats } from '@/types/analysis'
 import { useDataService } from '@/services'
+import type { AIEntityRef, ContactListItem, ContactsResponse } from '@openchatlab/shared-types'
 
 const { t } = useI18n()
 
-const props = defineProps<{
-  sessionId: string
-  disabled?: boolean
-  status?: 'ready' | 'submitted' | 'streaming' | 'error'
-  chatType: 'group' | 'private'
-  embedded?: boolean
-}>()
+const props = withDefaults(
+  defineProps<{
+    sessionId?: string
+    disabled?: boolean
+    status?: 'ready' | 'submitted' | 'streaming' | 'error'
+    chatType?: 'group' | 'private'
+    mentionScope?: 'session' | 'global'
+    skillsEnabled?: boolean
+    placeholder?: string
+    embedded?: boolean
+  }>(),
+  {
+    sessionId: '',
+    chatType: 'group',
+    mentionScope: 'session',
+    skillsEnabled: true,
+    placeholder: '',
+    embedded: false,
+  }
+)
 
 const emit = defineEmits<{
-  send: [payload: { content: string; mentionedMembers: MentionedMemberContext[] }]
+  send: [payload: { content: string; mentionedMembers: MentionedMemberContext[]; entityRefs: AIEntityRef[] }]
   stop: []
   manageSkills: []
   skillActivated: [skill: SkillSummary]
 }>()
 
-interface MentionCandidate extends MentionedMemberContext {
+interface MentionCandidate {
+  key: string
+  displayName: string
   insertName: string
-  subtitle: string
+  avatar: string | null
+  searchText: string
+  mentionText: string
+  mentionedMember?: MentionedMemberContext
+  entityRef?: AIEntityRef
+}
+
+interface MentionMenuItem {
+  id: string
+  label: string
+  avatar: string | null
   searchText: string
 }
 
-interface MentionRange {
-  start: number
-  end: number
-  rawToken: string
-}
+type MentionTab = 'contact' | 'group'
 
 const skillStore = useSkillStore()
+const sessionStore = useSessionStore()
 const { compatibleSkills, activeSkill, activeSkillId, isLoaded } = storeToRefs(skillStore)
 
 const rootRef = ref<HTMLElement | null>(null)
 const composerRef = ref<InstanceType<typeof AIChatComposer> | null>(null)
 const inputValue = ref('')
 const mentionMembers = ref<MemberWithStats[]>([])
-const selectedMentions = ref<MentionedMemberContext[]>([])
-const isLoadingMentionMembers = ref(false)
+const globalMentionCandidates = ref<MentionCandidate[]>([])
+const mentionRegistry = new Map<string, MentionCandidate>()
+const selectedMentionIds = ref<string[]>([])
+const mentionSearchTerm = ref('')
+const mentionTab = ref<MentionTab>('contact')
 const showSlashMenu = ref(false)
 const slashFilter = ref('')
 const slashHighlightIndex = ref(0)
-const showMentionMenu = ref(false)
-const mentionFilter = ref('')
-const mentionHighlightIndex = ref(0)
-const mentionRange = ref<MentionRange | null>(null)
 const isComposing = ref(false)
 const dismissedSlashValue = ref<string | null>(null)
-const dismissedMentionToken = ref<string | null>(null)
-const suspendInputParsing = ref(false)
+let globalMentionSearchTimer: ReturnType<typeof setTimeout> | null = null
+let globalMentionPollTimer: ReturnType<typeof setTimeout> | null = null
+let globalMentionRequestId = 0
+const GLOBAL_MENTION_POLL_INTERVAL_MS = 1500
 
 const canSubmit = computed(() => inputValue.value.trim().length > 0 && !props.disabled)
 const inputPlaceholder = computed(() => {
-  if (activeSkill.value && inputValue.value.trim().length === 0) {
+  if (props.placeholder) return props.placeholder
+  if (props.skillsEnabled && activeSkill.value && inputValue.value.trim().length === 0) {
     return t('ai.chat.input.placeholderWithActiveSkill', { name: activeSkill.value.name })
   }
   return t('ai.chat.input.placeholderWithSlash')
 })
 const sendButtonTitle = computed(() => {
-  if (props.status === 'streaming') {
-    return ''
-  }
-  if (canSubmit.value) {
-    return t('ai.chat.input.send')
-  }
-  if (activeSkill.value) {
-    return t('ai.chat.input.needMoreThanSkill')
-  }
+  if (props.status === 'streaming') return ''
+  if (canSubmit.value) return t('ai.chat.input.send')
+  if (props.skillsEnabled && activeSkill.value) return t('ai.chat.input.needMoreThanSkill')
   return t('ai.chat.input.needQuestion')
 })
 
-const mentionCandidates = computed<MentionCandidate[]>(() => {
+const sessionMentionCandidates = computed<MentionCandidate[]>(() => {
   const nameCount = new Map<string, number>()
 
   mentionMembers.value.forEach((member) => {
@@ -91,20 +110,19 @@ const mentionCandidates = computed<MentionCandidate[]>(() => {
   return mentionMembers.value.map((member) => {
     const displayName = member.groupNickname || member.accountName || member.platformId
     const insertName = (nameCount.get(displayName) ?? 0) > 1 ? `${displayName}·${member.platformId}` : displayName
-    const subtitleParts = [member.platformId]
-
-    if (member.aliases.length > 0) {
-      subtitleParts.push(member.aliases.join(' / '))
-    }
-
     return {
-      memberId: member.id,
-      platformId: member.platformId,
+      key: `member:${props.sessionId}:${member.id}`,
       displayName,
-      aliases: [...member.aliases],
+      avatar: member.avatar,
       mentionText: `@${insertName}`,
       insertName,
-      subtitle: subtitleParts.join(' · '),
+      mentionedMember: {
+        memberId: member.id,
+        platformId: member.platformId,
+        displayName,
+        aliases: [...member.aliases],
+        mentionText: `@${insertName}`,
+      },
       searchText: [
         displayName,
         member.groupNickname || '',
@@ -119,7 +137,30 @@ const mentionCandidates = computed<MentionCandidate[]>(() => {
   })
 })
 
+const mentionCandidates = computed(() => {
+  if (props.mentionScope !== 'global') return sessionMentionCandidates.value
+  return globalMentionCandidates.value.filter((candidate) =>
+    mentionTab.value === 'contact' ? candidate.entityRef?.type === 'contact' : candidate.entityRef?.type === 'session'
+  )
+})
+
+const mentionMenuItems = computed<MentionMenuItem[]>(() => {
+  const keyword = mentionSearchTerm.value.trim().toLocaleLowerCase()
+  const candidates =
+    props.mentionScope === 'global' && keyword
+      ? mentionCandidates.value.filter((candidate) => candidate.searchText.includes(keyword))
+      : mentionCandidates.value
+
+  return candidates.map((candidate) => ({
+    id: candidate.key,
+    label: candidate.insertName,
+    avatar: candidate.avatar,
+    searchText: candidate.searchText,
+  }))
+})
+
 const filteredSkills = computed(() => {
+  if (!props.skillsEnabled) return []
   const keyword = slashFilter.value.trim().toLocaleLowerCase()
   if (!keyword) return compatibleSkills.value
 
@@ -129,51 +170,147 @@ const filteredSkills = computed(() => {
   })
 })
 
-const filteredMentionCandidates = computed(() => {
-  const keyword = mentionFilter.value.trim().toLocaleLowerCase()
-  if (!keyword) return mentionCandidates.value
-  return mentionCandidates.value.filter((member) => member.searchText.includes(keyword))
-})
-
-function syncTextareaHeight() {
-  composerRef.value?.syncHeight()
-}
-
-function focusTextarea() {
-  composerRef.value?.focus()
+function focusEditor() {
+  composerRef.value?.focus('end')
 }
 
 async function loadMentionMembers() {
-  if (!props.sessionId) {
+  if (props.mentionScope !== 'session' || !props.sessionId) {
     mentionMembers.value = []
     return
   }
 
-  isLoadingMentionMembers.value = true
   try {
     const members = await useDataService().getMembers(props.sessionId)
     mentionMembers.value = [...members].sort((a, b) => b.messageCount - a.messageCount)
   } catch (error) {
-    console.error('加载 AI @ 成员列表失败:', error)
+    console.error('Failed to load AI mention members:', error)
     mentionMembers.value = []
-  } finally {
-    isLoadingMentionMembers.value = false
   }
 }
 
+function buildGlobalMentionCandidates(contacts: ContactListItem[], query: string): MentionCandidate[] {
+  const groupLabel = t('ai.global.entityPicker.groups')
+  const rawCandidates = [
+    ...contacts.map((contact) => ({
+      key: `contact:${contact.key}`,
+      displayName: contact.displayName,
+      avatar: contact.avatar,
+      duplicateSuffix: contact.platformId,
+      searchText: [contact.displayName, contact.platformId, contact.aliases.join(' ')].join(' ').toLocaleLowerCase(),
+      entityRef: {
+        type: 'contact' as const,
+        contactKey: contact.key,
+        displayName: contact.displayName,
+      },
+    })),
+    ...sessionStore.sessions
+      .filter((session) => session.type === 'group')
+      .map((session) => ({
+        key: `session:${session.id}`,
+        displayName: session.name,
+        avatar: session.groupAvatar,
+        duplicateSuffix: groupLabel,
+        searchText: [session.name, session.platform].join(' ').toLocaleLowerCase(),
+        entityRef: {
+          type: 'session' as const,
+          sessionId: session.id,
+          displayName: session.name,
+          sessionType: 'group' as const,
+        },
+      })),
+  ]
+
+  const keyword = query.trim().toLocaleLowerCase()
+  const filteredCandidates = keyword
+    ? rawCandidates.filter((candidate) => candidate.searchText.includes(keyword))
+    : rawCandidates
+  const nameCount = new Map<string, number>()
+  filteredCandidates.forEach((candidate) => {
+    nameCount.set(candidate.displayName, (nameCount.get(candidate.displayName) ?? 0) + 1)
+  })
+
+  return filteredCandidates.map((candidate) => {
+    const insertName =
+      (nameCount.get(candidate.displayName) ?? 0) > 1
+        ? `${candidate.displayName}·${candidate.duplicateSuffix}`
+        : candidate.displayName
+    return {
+      key: candidate.key,
+      displayName: candidate.displayName,
+      insertName,
+      avatar: candidate.avatar,
+      searchText: candidate.searchText,
+      mentionText: `@${insertName}`,
+      entityRef: candidate.entityRef,
+    }
+  })
+}
+
+async function loadGlobalMentionCandidates(query: string) {
+  const requestId = ++globalMentionRequestId
+  try {
+    const options = {
+      acceptStale: true,
+      timeRangePreset: 'all',
+      page: 1,
+      pageSize: 100,
+      query: query.trim() || undefined,
+    } as const
+    const responses = await Promise.all([
+      useDataService().getContacts({ ...options, pool: 'friend' }),
+      useDataService().getContacts({ ...options, pool: 'non_friend' }),
+    ])
+    if (requestId !== globalMentionRequestId) return
+
+    const contactsByKey = new Map<string, ContactListItem>()
+    responses.flatMap((response) => response.contacts).forEach((contact) => contactsByKey.set(contact.key, contact))
+    globalMentionCandidates.value = buildGlobalMentionCandidates([...contactsByKey.values()], query)
+    scheduleGlobalMentionPolling(responses, query)
+  } catch (error) {
+    if (requestId !== globalMentionRequestId) return
+    stopGlobalMentionPolling()
+    console.error('Failed to load global AI mention candidates:', error)
+    globalMentionCandidates.value = buildGlobalMentionCandidates([], query)
+  }
+}
+
+function stopGlobalMentionPolling() {
+  if (!globalMentionPollTimer) return
+  clearTimeout(globalMentionPollTimer)
+  globalMentionPollTimer = null
+}
+
+function scheduleGlobalMentionPolling(responses: ContactsResponse[], query: string) {
+  stopGlobalMentionPolling()
+  if (props.mentionScope !== 'global') return
+  if (!responses.some((response) => response.task?.status === 'running')) return
+
+  globalMentionPollTimer = setTimeout(() => {
+    globalMentionPollTimer = null
+    void loadGlobalMentionCandidates(query)
+  }, GLOBAL_MENTION_POLL_INTERVAL_MS)
+}
+
+function scheduleGlobalMentionSearch(query: string) {
+  if (globalMentionSearchTimer) clearTimeout(globalMentionSearchTimer)
+  stopGlobalMentionPolling()
+  globalMentionRequestId++
+  globalMentionSearchTimer = setTimeout(
+    () => {
+      globalMentionSearchTimer = null
+      void loadGlobalMentionCandidates(query)
+    },
+    query ? 200 : 0
+  )
+}
+
 function resetSlashState() {
   showSlashMenu.value = false
   slashFilter.value = ''
   slashHighlightIndex.value = 0
 }
 
-function resetMentionState() {
-  showMentionMenu.value = false
-  mentionFilter.value = ''
-  mentionHighlightIndex.value = 0
-  mentionRange.value = null
-}
-
 function dismissSlashMenu() {
   if (/^\s*\/([^\n]*)$/.test(inputValue.value)) {
     dismissedSlashValue.value = inputValue.value
@@ -181,15 +318,8 @@ function dismissSlashMenu() {
   resetSlashState()
 }
 
-function dismissMentionMenu() {
-  if (mentionRange.value) {
-    dismissedMentionToken.value = mentionRange.value.rawToken
-  }
-  resetMentionState()
-}
-
 function updateSlashState(value: string) {
-  if (props.disabled) {
+  if (props.disabled || !props.skillsEnabled) {
     resetSlashState()
     return
   }
@@ -198,7 +328,6 @@ function updateSlashState(value: string) {
     dismissedSlashValue.value = null
   }
 
-  // 只在输入开头检测 slash，避免普通文本中的 / 误触发技能菜单。
   const match = value.match(/^\s*\/([^\n]*)$/)
   if (!match) {
     resetSlashState()
@@ -214,225 +343,64 @@ function updateSlashState(value: string) {
   }
 
   showSlashMenu.value = true
-  if (shouldResetHighlight) {
-    slashHighlightIndex.value = 0
-  }
-}
-
-function getTextareaSelection() {
-  return composerRef.value?.getSelection() ?? { start: inputValue.value.length, end: inputValue.value.length }
-}
-
-function extractMentionRange(value: string): (MentionRange & { query: string }) | null {
-  const { start, end } = getTextareaSelection()
-  if (start !== end) return null
-
-  const beforeCursor = value.slice(0, start)
-  // 允许在正文任意位置通过 @ 触发成员选择，不强制要求前面必须是空白。
-  const match = beforeCursor.match(/@([^\s@]*)$/)
-  if (!match) return null
-
-  const query = match[1]
-  const tokenStart = beforeCursor.length - query.length - 1
-
-  return {
-    start: tokenStart,
-    end: start,
-    rawToken: beforeCursor.slice(tokenStart),
-    query,
-  }
-}
-
-function updateMentionState(value: string) {
-  if (props.disabled || showSlashMenu.value) {
-    resetMentionState()
-    return
-  }
-
-  const nextMention = extractMentionRange(value)
-
-  if (dismissedMentionToken.value && dismissedMentionToken.value !== nextMention?.rawToken) {
-    dismissedMentionToken.value = null
-  }
-
-  if (!nextMention) {
-    resetMentionState()
-    return
-  }
-
-  const shouldResetHighlight =
-    !showMentionMenu.value ||
-    mentionFilter.value !== nextMention.query ||
-    mentionRange.value?.rawToken !== nextMention.rawToken
-
-  mentionFilter.value = nextMention.query
-  mentionRange.value = {
-    start: nextMention.start,
-    end: nextMention.end,
-    rawToken: nextMention.rawToken,
-  }
-
-  if (dismissedMentionToken.value === nextMention.rawToken) {
-    showMentionMenu.value = false
-    return
-  }
-
-  showMentionMenu.value = true
-  if (shouldResetHighlight) {
-    mentionHighlightIndex.value = 0
-  }
-}
-
-function updateInputMenus(value: string) {
-  updateSlashState(value)
-
-  if (showSlashMenu.value) {
-    resetMentionState()
-    return
-  }
-
-  updateMentionState(value)
-}
-
-function syncSelectedMentions(value: string) {
-  selectedMentions.value = selectedMentions.value.filter((member) => value.includes(member.mentionText))
-}
-
-function deleteMentionAtCursor(): boolean {
-  const { start, end } = getTextareaSelection()
-  if (start !== end || start === 0) return false
-
-  const mentionTexts = [...new Set(selectedMentions.value.map((member) => member.mentionText))].sort(
-    (a, b) => b.length - a.length
-  )
-
-  for (const mentionText of mentionTexts) {
-    let searchIndex = inputValue.value.indexOf(mentionText)
-
-    while (searchIndex !== -1) {
-      const mentionStart = searchIndex
-      const mentionEnd = searchIndex + mentionText.length
-      const deleteEnd = inputValue.value[mentionEnd] === ' ' ? mentionEnd + 1 : mentionEnd
-
-      // 光标落在 mention 内部、末尾或其后面的补位空格时，统一整段删除。
-      if (start > mentionStart && start <= deleteEnd) {
-        suspendInputParsing.value = true
-        inputValue.value = inputValue.value.slice(0, mentionStart) + inputValue.value.slice(deleteEnd)
-        dismissedMentionToken.value = null
-
-        nextTick(() => {
-          syncTextareaHeight()
-          focusTextarea()
-          composerRef.value?.setSelectionRange(mentionStart, mentionStart)
-          suspendInputParsing.value = false
-          updateInputMenus(inputValue.value)
-        })
-
-        return true
-      }
-
-      searchIndex = inputValue.value.indexOf(mentionText, searchIndex + mentionText.length)
-    }
-  }
-
-  return false
+  if (shouldResetHighlight) slashHighlightIndex.value = 0
 }
 
 function clearActiveSkill() {
   skillStore.activateSkill(null)
-  nextTick(focusTextarea)
+  nextTick(focusEditor)
 }
 
 function openSkillSelector() {
-  if (props.disabled) return
+  if (props.disabled || !props.skillsEnabled) return
+  if (activeSkillId.value) skillStore.activateSkill(null)
 
-  // 从外部快捷入口进入技能选择时，统一回到 slash 模式并清掉旧技能上下文。
-  if (activeSkillId.value) {
-    skillStore.activateSkill(null)
-  }
-
-  suspendInputParsing.value = true
-  inputValue.value = '/'
   dismissedSlashValue.value = null
-
-  nextTick(() => {
-    syncTextareaHeight()
-    focusTextarea()
-    composerRef.value?.setSelectionRange(1, 1)
-    suspendInputParsing.value = false
-    updateInputMenus(inputValue.value)
-  })
+  inputValue.value = '/'
+  nextTick(focusEditor)
 }
 
 function fillInput(content: string) {
   if (props.disabled) return
 
-  // 预设问题只回填到输入框，保留用户二次编辑的机会。
-  suspendInputParsing.value = true
-  inputValue.value = content
   dismissedSlashValue.value = null
-
-  nextTick(() => {
-    syncTextareaHeight()
-    focusTextarea()
-    const cursor = inputValue.value.length
-    composerRef.value?.setSelectionRange(cursor, cursor)
-    suspendInputParsing.value = false
-    updateInputMenus(inputValue.value)
-  })
+  inputValue.value = content
+  nextTick(focusEditor)
 }
 
-function handleSelectMention(
-  member: Pick<MentionCandidate, 'memberId' | 'platformId' | 'displayName' | 'insertName' | 'aliases'>
-) {
-  if (props.disabled || !mentionRange.value) return
+function handleMentionsChange(ids: string[]) {
+  selectedMentionIds.value = ids
+}
 
-  const prefix = inputValue.value.slice(0, mentionRange.value.start)
-  const suffix = inputValue.value.slice(mentionRange.value.end)
-  const mentionText = `@${member.insertName}`
-  const nextValue = `${prefix}${mentionText} ${suffix}`
-
-  selectedMentions.value = [
-    ...selectedMentions.value.filter((item) => item.memberId !== member.memberId),
-    {
-      memberId: member.memberId,
-      platformId: member.platformId,
-      displayName: member.displayName,
-      aliases: [...member.aliases],
-      mentionText,
-    },
-  ]
-
-  suspendInputParsing.value = true
-  inputValue.value = nextValue
-  dismissedMentionToken.value = null
-  resetMentionState()
-
-  nextTick(() => {
-    const cursor = prefix.length + mentionText.length + 1
-    syncTextareaHeight()
-    focusTextarea()
-    composerRef.value?.setSelectionRange(cursor, cursor)
-    suspendInputParsing.value = false
-    updateInputMenus(inputValue.value)
-  })
+function handleMentionSearchTerm(value: string) {
+  mentionSearchTerm.value = value
+  if (props.mentionScope === 'global') scheduleGlobalMentionSearch(value)
 }
 
 function handleSubmit() {
   if (!canSubmit.value) return
 
+  const candidates = selectedMentionIds.value.flatMap((id) => {
+    const candidate = mentionRegistry.get(id)
+    return candidate ? [candidate] : []
+  })
+
   emit('send', {
     content: inputValue.value.trim(),
-    mentionedMembers: [...selectedMentions.value],
+    mentionedMembers: candidates.flatMap((candidate) =>
+      candidate.mentionedMember
+        ? [{ ...candidate.mentionedMember, aliases: [...candidate.mentionedMember.aliases] }]
+        : []
+    ),
+    entityRefs: candidates.flatMap((candidate) => (candidate.entityRef ? [{ ...candidate.entityRef }] : [])),
   })
-  inputValue.value = ''
-  dismissedSlashValue.value = null
-  dismissedMentionToken.value = null
-  selectedMentions.value = []
-  resetMentionState()
 
-  // 技能为单次消息生效：发送后立即清空，下一次提问需重新选择。
-  if (activeSkillId.value) {
+  inputValue.value = ''
+  selectedMentionIds.value = []
+  mentionSearchTerm.value = ''
+  dismissedSlashValue.value = null
+
+  if (props.skillsEnabled && activeSkillId.value) {
     skillStore.activateSkill(null)
   }
 }
@@ -442,15 +410,10 @@ function handleSelectSkill(skill: SkillSummary) {
 
   skillStore.activateSkill(skill.id)
   emit('skillActivated', skill)
-
-  // slash 选择技能只改变当前上下文，不应替用户生成一条消息。
   inputValue.value = ''
   dismissedSlashValue.value = null
   resetSlashState()
-
-  nextTick(() => {
-    focusTextarea()
-  })
+  nextTick(focusEditor)
 }
 
 function handleManageSkills() {
@@ -460,135 +423,69 @@ function handleManageSkills() {
 
 function moveSlashHighlight(step: 1 | -1) {
   if (!filteredSkills.value.length) return
-
   const total = filteredSkills.value.length
   slashHighlightIndex.value = (slashHighlightIndex.value + step + total) % total
 }
 
-function moveMentionHighlight(step: 1 | -1) {
-  if (!filteredMentionCandidates.value.length) return
-
-  const total = filteredMentionCandidates.value.length
-  mentionHighlightIndex.value = (mentionHighlightIndex.value + step + total) % total
-}
-
 function handleKeydown(event: KeyboardEvent) {
-  if (event.key === 'Backspace' && inputValue.value.length === 0 && activeSkillId.value) {
+  if (props.skillsEnabled && event.key === 'Backspace' && inputValue.value.length === 0 && activeSkillId.value) {
     event.preventDefault()
     clearActiveSkill()
     return
   }
 
-  if (event.key === 'Backspace' && deleteMentionAtCursor()) {
-    event.preventDefault()
-    return
-  }
-
-  if (showMentionMenu.value) {
-    if (event.key === 'ArrowDown') {
-      event.preventDefault()
-      moveMentionHighlight(1)
-      return
-    }
-
-    if (event.key === 'ArrowUp') {
-      event.preventDefault()
-      moveMentionHighlight(-1)
-      return
-    }
-
-    if (event.key === 'Escape') {
-      event.preventDefault()
-      dismissMentionMenu()
-      return
-    }
-
-    if ((event.key === 'Enter' && !event.shiftKey && !isComposing.value) || event.key === 'Tab') {
-      event.preventDefault()
-      const member = filteredMentionCandidates.value[mentionHighlightIndex.value]
-      if (member) {
-        handleSelectMention(member)
-      }
-      return
-    }
-  }
-
   if (showSlashMenu.value) {
     if (event.key === 'ArrowDown') {
       event.preventDefault()
       moveSlashHighlight(1)
       return
     }
-
     if (event.key === 'ArrowUp') {
       event.preventDefault()
       moveSlashHighlight(-1)
       return
     }
-
     if (event.key === 'Escape') {
       event.preventDefault()
       dismissSlashMenu()
       return
     }
-
     if ((event.key === 'Enter' && !event.shiftKey && !isComposing.value) || event.key === 'Tab') {
       event.preventDefault()
       const skill = filteredSkills.value[slashHighlightIndex.value]
-      if (skill) {
-        handleSelectSkill(skill)
-      }
+      if (skill) handleSelectSkill(skill)
       return
     }
   }
 
-  if (event.key === 'Enter' && !event.shiftKey && !isComposing.value) {
+  if (event.key === 'Enter' && !event.shiftKey && !isComposing.value && !event.isComposing) {
     event.preventDefault()
     handleSubmit()
   }
 }
 
 function handleDocumentMouseDown(event: MouseEvent) {
-  if ((!showSlashMenu.value && !showMentionMenu.value) || !rootRef.value) return
-
+  if (!showSlashMenu.value || !rootRef.value) return
   const target = event.target
-  if (target instanceof Node && !rootRef.value.contains(target)) {
-    dismissSlashMenu()
-    dismissMentionMenu()
-  }
+  if (target instanceof Node && !rootRef.value.contains(target)) dismissSlashMenu()
 }
 
-function handleCursorChange() {
-  if (suspendInputParsing.value) return
-  updateInputMenus(inputValue.value)
-}
+watch(inputValue, updateSlashState)
 
 watch(
-  () => props.chatType,
-  (chatType) => {
-    skillStore.setFilterContext(chatType)
+  mentionCandidates,
+  (candidates) => {
+    candidates.forEach((candidate) => mentionRegistry.set(candidate.key, candidate))
   },
   { immediate: true }
 )
 
-watch(inputValue, async (value) => {
-  syncSelectedMentions(value)
-  if (!suspendInputParsing.value) {
-    updateInputMenus(value)
-  }
-  await nextTick()
-  syncTextareaHeight()
-})
-
 watch(
   filteredSkills,
   (skills) => {
     if (skills.length === 0) {
       slashHighlightIndex.value = 0
-      return
-    }
-
-    if (slashHighlightIndex.value >= skills.length) {
+    } else if (slashHighlightIndex.value >= skills.length) {
       slashHighlightIndex.value = skills.length - 1
     }
   },
@@ -596,16 +493,9 @@ watch(
 )
 
 watch(
-  filteredMentionCandidates,
-  (members) => {
-    if (members.length === 0) {
-      mentionHighlightIndex.value = 0
-      return
-    }
-
-    if (mentionHighlightIndex.value >= members.length) {
-      mentionHighlightIndex.value = members.length - 1
-    }
+  () => [props.chatType, props.skillsEnabled] as const,
+  ([chatType, skillsEnabled]) => {
+    if (skillsEnabled) skillStore.setFilterContext(chatType)
   },
   { immediate: true }
 )
@@ -613,34 +503,40 @@ watch(
 watch(
   () => props.disabled,
   (disabled) => {
-    if (disabled) {
-      dismissSlashMenu()
-      dismissMentionMenu()
-    }
+    if (disabled) dismissSlashMenu()
   }
 )
 
 watch(
-  () => props.sessionId,
+  () => [props.sessionId, props.mentionScope] as const,
   () => {
-    selectedMentions.value = []
-    resetMentionState()
-    loadMentionMembers()
+    selectedMentionIds.value = []
+    mentionSearchTerm.value = ''
+    void loadMentionMembers()
+    stopGlobalMentionPolling()
+    globalMentionRequestId++
+
+    if (props.mentionScope === 'global') {
+      globalMentionCandidates.value = buildGlobalMentionCandidates([], '')
+      void loadGlobalMentionCandidates('')
+    } else {
+      globalMentionCandidates.value = []
+    }
   },
   { immediate: true }
 )
 
 onMounted(async () => {
-  if (!isLoaded.value) {
+  if (props.skillsEnabled && !isLoaded.value) {
     await skillStore.loadSkills()
   }
-
-  await nextTick()
-  syncTextareaHeight()
   document.addEventListener('mousedown', handleDocumentMouseDown)
 })
 
 onBeforeUnmount(() => {
+  if (globalMentionSearchTimer) clearTimeout(globalMentionSearchTimer)
+  stopGlobalMentionPolling()
+  globalMentionRequestId += 1
   document.removeEventListener('mousedown', handleDocumentMouseDown)
 })
 
@@ -654,6 +550,7 @@ defineExpose({
   <div class="shrink-0" :class="[props.embedded ? '' : 'pt-2 pb-2']">
     <div ref="rootRef" class="w-full max-w-4xl mx-auto" :class="{ relative: !props.embedded }">
       <SlashCommandMenu
+        v-if="props.skillsEnabled"
         :visible="showSlashMenu"
         :skills="filteredSkills"
         :highlight-index="slashHighlightIndex"
@@ -664,16 +561,6 @@ defineExpose({
         @highlight="slashHighlightIndex = $event"
       />
 
-      <MemberMentionMenu
-        :visible="showMentionMenu"
-        :members="filteredMentionCandidates"
-        :highlight-index="mentionHighlightIndex"
-        :loading="isLoadingMentionMembers"
-        @select="handleSelectMention"
-        @close="dismissMentionMenu"
-        @highlight="mentionHighlightIndex = $event"
-      />
-
       <AIChatComposer
         ref="composerRef"
         v-model="inputValue"
@@ -681,12 +568,21 @@ defineExpose({
         :status="props.status"
         :placeholder="inputPlaceholder"
         :send-button-title="sendButtonTitle"
-        :active-skill-name="activeSkill?.name"
+        :active-skill-name="props.skillsEnabled ? activeSkill?.name : undefined"
+        :mention-items="mentionMenuItems"
+        :mention-search-term="mentionSearchTerm"
+        :async-mention-search="props.mentionScope === 'global'"
+        :show-mention-tabs="props.mentionScope === 'global'"
+        :mention-tab="mentionTab"
+        :contact-tab-label="t('ai.global.entityPicker.contacts')"
+        :group-tab-label="t('ai.global.entityPicker.groups')"
         :embedded="props.embedded"
+        @update:mention-search-term="handleMentionSearchTerm"
+        @update:mention-tab="mentionTab = $event"
+        @mentions-change="handleMentionsChange"
         @submit="handleSubmit"
         @stop="emit('stop')"
         @keydown="handleKeydown"
-        @cursor-change="handleCursorChange"
         @composition-start="isComposing = true"
         @composition-end="isComposing = false"
       />
diff --git a/src/components/AIChat/input/AIChatMentionMenu.vue b/src/components/AIChat/input/AIChatMentionMenu.vue
new file mode 100644
index 00000000..6e6c26b7
--- /dev/null
+++ b/src/components/AIChat/input/AIChatMentionMenu.vue
@@ -0,0 +1,160 @@
+<script setup lang="ts">
+import { computed, h, nextTick, onBeforeUnmount, onMounted, toRef } from 'vue'
+import type { Editor } from '@tiptap/vue-3'
+import { useEditorMenu } from '@nuxt/ui/composables'
+import LazyAvatar from '@/components/common/avatar/LazyAvatar.vue'
+
+export interface AIChatMentionMenuItem {
+  id: string
+  label: string
+  avatar?: string | null
+  searchText?: string
+}
+
+type MentionTab = 'contact' | 'group'
+
+const props = withDefaults(
+  defineProps<{
+    editor?: Editor
+    items?: AIChatMentionMenuItem[]
+    searchTerm?: string
+    filterFields?: string[]
+    ignoreFilter?: boolean
+    limit?: number
+    appendTo?: HTMLElement | (() => HTMLElement)
+    showTabs?: boolean
+    activeTab?: MentionTab
+    contactTabLabel?: string
+    groupTabLabel?: string
+  }>(),
+  {
+    items: () => [],
+    searchTerm: '',
+    filterFields: () => ['label'],
+    ignoreFilter: false,
+    limit: 42,
+    showTabs: false,
+    activeTab: 'contact',
+    contactTabLabel: '',
+    groupTabLabel: '',
+  }
+)
+
+const emit = defineEmits<{
+  'update:searchTerm': [value: string]
+  'update:activeTab': [value: MentionTab]
+}>()
+
+const searchTerm = computed({
+  get: () => props.searchTerm,
+  set: (value) => emit('update:searchTerm', value),
+})
+const tabItem: AIChatMentionMenuItem & { type: 'label' } = {
+  id: '__mention-tabs__',
+  label: '',
+  type: 'label',
+}
+const menuItems = computed(() => (props.showTabs ? [tabItem, ...props.items] : props.items))
+
+const menuUi = computed(() => ({
+  content: () => 'flex flex-col',
+  viewport: () => 'relative flex-1 overflow-y-auto',
+  group: () => 'isolate',
+  label: () => 'ai-chat-mention-tabs sticky top-0 z-10',
+  separator: () => 'h-px bg-border',
+  item: () =>
+    'group relative flex w-full items-center select-none outline-none before:absolute before:z-[-1] data-disabled:cursor-not-allowed data-disabled:opacity-75',
+}))
+
+let menu: ReturnType<typeof useEditorMenu<AIChatMentionMenuItem>> | null = null
+
+function renderTabs() {
+  return h('div', { class: 'ai-chat-mention-tabs__inner' }, [
+    h(
+      'button',
+      {
+        type: 'button',
+        class: ['ai-chat-mention-tabs__button', props.activeTab === 'contact' && 'is-active'],
+        'aria-pressed': props.activeTab === 'contact',
+        onMousedown: (event: MouseEvent) => event.preventDefault(),
+        onClick: () => emit('update:activeTab', 'contact'),
+      },
+      props.contactTabLabel
+    ),
+    h(
+      'button',
+      {
+        type: 'button',
+        class: ['ai-chat-mention-tabs__button', props.activeTab === 'group' && 'is-active'],
+        'aria-pressed': props.activeTab === 'group',
+        onMousedown: (event: MouseEvent) => event.preventDefault(),
+        onClick: () => emit('update:activeTab', 'group'),
+      },
+      props.groupTabLabel
+    ),
+  ])
+}
+
+onMounted(async () => {
+  await nextTick()
+  if (!props.editor || props.editor.isDestroyed) return
+
+  menu = useEditorMenu<AIChatMentionMenuItem>({
+    editor: props.editor,
+    char: '@',
+    pluginKey: 'mentionMenu',
+    items: toRef(() => menuItems.value),
+    filterFields: props.filterFields,
+    ignoreFilter: props.ignoreFilter,
+    limit: props.limit,
+    options: { placement: 'top-start' },
+    appendTo: props.appendTo,
+    searchTerm,
+    ui: menuUi,
+    onSelect: (editor, range, item) => {
+      editor
+        .chain()
+        .focus()
+        .deleteRange(range)
+        .insertContent({
+          type: 'mention',
+          attrs: {
+            id: item.id,
+            label: item.label,
+            mentionSuggestionChar: '@',
+          },
+        })
+        .run()
+    },
+    renderItem: (item) => {
+      if ('type' in item && item.type === 'label') return renderTabs()
+
+      const leading = h(LazyAvatar, {
+        src: item.avatar,
+        alt: item.label,
+        text: item.label.slice(0, 1),
+        rootClass: 'h-5 w-5 shrink-0',
+        imageClass: 'h-5 w-5 rounded-md object-cover',
+        fallbackClass:
+          'flex h-5 w-5 items-center justify-center rounded-md bg-gray-100 text-[9px] text-gray-500 dark:bg-gray-800 dark:text-gray-400',
+        rootMargin: '0px',
+      })
+
+      return [leading, h('span', { class: 'min-w-0 flex-1 truncate text-sm leading-[18px]' }, item.label)]
+    },
+  })
+  props.editor.registerPlugin(menu.plugin)
+})
+
+onBeforeUnmount(() => {
+  menu?.destroy()
+  menu = null
+  if (props.editor && !props.editor.isDestroyed) {
+    props.editor.unregisterPlugin('mentionMenu')
+  }
+})
+</script>
+
+<template>
+  <div />
+</template>
diff --git a/src/components/AIChat/input/MemberMentionMenu.vue b/src/components/AIChat/input/MemberMentionMenu.vue
deleted file mode 100644
index ff2d88ba..00000000
--- a/src/components/AIChat/input/MemberMentionMenu.vue
+++ /dev/null
@@ -1,121 +0,0 @@
-<script setup lang="ts">
-import { nextTick, ref, watch } from 'vue'
-import { useI18n } from 'vue-i18n'
-
-interface MentionCandidate {
-  memberId: number
-  platformId: string
-  displayName: string
-  insertName: string
-  aliases: string[]
-  subtitle: string
-}
-
-const { t } = useI18n()
-
-const props = defineProps<{
-  visible: boolean
-  members: MentionCandidate[]
-  highlightIndex: number
-  loading?: boolean
-}>()
-
-const emit = defineEmits<{
-  select: [member: MentionCandidate]
-  close: []
-  highlight: [index: number]
-}>()
-
-const listRef = ref<HTMLElement | null>(null)
-
-watch(
-  () => [props.visible, props.highlightIndex, props.members.length] as const,
-  async ([visible, highlightIndex]) => {
-    if (!visible || !listRef.value) return
-
-    await nextTick()
-    const items = listRef.value.querySelectorAll<HTMLElement>('[data-mention-item]')
-    const target = items[highlightIndex]
-    // 键盘切换高亮时，保持当前项始终处于可见区域内。
-    target?.scrollIntoView({ block: 'nearest' })
-  }
-)
-</script>
-
-<template>
-  <Transition name="mention-menu">
-    <div v-if="visible" class="absolute bottom-full left-0 z-20 mb-1.5 w-[240px] max-w-[calc(100vw-2rem)]">
-      <div
-        class="overflow-hidden rounded-2xl border border-gray-200 bg-white shadow-overlay dark:border-gray-700 dark:bg-page-dark"
-      >
-        <div class="flex items-center justify-between border-b border-gray-100 px-2.5 py-1.5 dark:border-gray-800">
-          <div class="flex items-center gap-1.5 text-[11px] text-gray-500 dark:text-gray-400">
-            <span>{{ t('ai.chat.input.mentionHint') }}</span>
-          </div>
-          <button
-            type="button"
-            class="rounded-md p-0.5 text-gray-400 transition-colors hover:bg-gray-100 hover:text-gray-600 dark:hover:bg-gray-800 dark:hover:text-gray-300"
-            :title="t('common.close')"
-            @click="emit('close')"
-          >
-            <UIcon name="i-heroicons-x-mark" class="h-3.5 w-3.5" />
-          </button>
-        </div>
-
-        <div v-if="props.loading" class="px-3 py-4 text-center text-xs text-gray-500 dark:text-gray-400">
-          {{ t('common.loading') }}
-        </div>
-
-        <div v-else-if="props.members.length > 0" ref="listRef" class="max-h-72 overflow-y-auto p-1.5">
-          <button
-            v-for="(member, index) in props.members"
-            :key="`${member.memberId}-${member.insertName}`"
-            type="button"
-            data-mention-item
-            class="flex w-full items-start justify-between gap-1.5 rounded-lg px-2.5 py-1.5 text-left transition-colors"
-            :class="
-              index === props.highlightIndex
-                ? 'bg-primary-50 text-gray-900 dark:bg-primary-950/30 dark:text-gray-100'
-                : 'text-gray-700 hover:bg-gray-50 dark:text-gray-200 dark:hover:bg-gray-800/80'
-            "
-            @mouseenter="emit('highlight', index)"
-            @click="emit('select', member)"
-          >
-            <div class="min-w-0 flex-1">
-              <div class="flex items-center gap-1.5">
-                <span class="truncate text-xs font-medium">@{{ member.insertName }}</span>
-              </div>
-              <p class="mt-0.5 line-clamp-2 text-[11px] leading-4 text-gray-500 dark:text-gray-400">
-                {{ member.subtitle }}
-              </p>
-            </div>
-          </button>
-        </div>
-
-        <div v-else class="px-3 py-4 text-center">
-          <p class="text-sm font-medium text-gray-700 dark:text-gray-200">
-            {{ t('ai.chat.input.mentionEmpty') }}
-          </p>
-          <p class="mt-1 text-xs leading-5 text-gray-500 dark:text-gray-400">
-            {{ t('ai.chat.input.mentionEmptyHint') }}
-          </p>
-        </div>
-      </div>
-    </div>
-  </Transition>
-</template>
-
-<style scoped>
-.mention-menu-enter-active,
-.mention-menu-leave-active {
-  transition:
-    opacity 0.16s ease,
-    transform 0.16s ease;
-}
-
-.mention-menu-enter-from,
-.mention-menu-leave-to {
-  transform: translateY(8px);
-  opacity: 0;
-}
-</style>
diff --git a/src/components/AIChat/input/SimpleAIChatInput.vue b/src/components/AIChat/input/SimpleAIChatInput.vue
index cfc49256..bea69ffb 100644
--- a/src/components/AIChat/input/SimpleAIChatInput.vue
+++ b/src/components/AIChat/input/SimpleAIChatInput.vue
@@ -42,8 +42,7 @@ function fillInput(content: string) {
   if (props.disabled) return
   inputValue.value = content
   nextTick(() => {
-    composerRef.value?.focus()
-    composerRef.value?.setSelectionRange(content.length, content.length)
+    composerRef.value?.focus('end')
   })
 }
 
diff --git a/src/components/common/Sidebar.vue b/src/components/common/Sidebar.vue
index c0668984..4707102d 100644
--- a/src/components/common/Sidebar.vue
+++ b/src/components/common/Sidebar.vue
@@ -519,6 +519,14 @@ function getAvatarColorClass(session: AnalysisSession, isActive: boolean) {
           @click="handleImport"
         />
 
+        <SidebarButton
+          v-if="props.backendFeatures"
+          icon="i-heroicons-chat-bubble-left-ellipsis"
+          :title="t('analysis.tabs.aiChat')"
+          :active="isGlobalAIPage"
+          @click="openGlobalAI"
+        />
+
         <template v-if="showInsightNavigation">
           <SidebarButton
             v-for="item in resolvedPrimaryNavigation"
@@ -542,14 +550,6 @@ function getAvatarColorClass(session: AnalysisSession, isActive: boolean) {
           :active="isPeoplePage"
           @click="openContacts"
         />
-
-        <SidebarButton
-          v-if="props.backendFeatures"
-          icon="i-heroicons-chat-bubble-left-ellipsis"
-          :title="t('analysis.tabs.aiChat')"
-          :active="isGlobalAIPage"
-          @click="openGlobalAI"
-        />
       </div>
     </div>
 
diff --git a/src/components/common/avatar/LazyAvatar.vue b/src/components/common/avatar/LazyAvatar.vue
index e9ba1463..09500ae8 100644
--- a/src/components/common/avatar/LazyAvatar.vue
+++ b/src/components/common/avatar/LazyAvatar.vue
@@ -8,7 +8,7 @@ const props = withDefaults(
   defineProps<{
     src?: string | null
     alt: string
-    text: string
+    text?: string
     rootClass?: AvatarClass
     imageClass?: AvatarClass
     fallbackClass?: AvatarClass
@@ -16,6 +16,7 @@ const props = withDefaults(
   }>(),
   {
     src: null,
+    text: '',
     rootClass: 'h-8 w-8 shrink-0',
     imageClass: 'h-8 w-8 rounded-full object-cover',
     fallbackClass: 'flex h-8 w-8 items-center justify-center rounded-full text-[10px] font-bold',
@@ -28,6 +29,7 @@ const shouldLoadImage = ref(false)
 let stopObserving: (() => void) | null = null
 
 const hasAvatar = computed(() => Boolean(props.src))
+const fallbackText = computed(() => props.text || props.alt.trim().slice(0, 1))
 
 function cleanupObserver() {
   stopObserving?.()
@@ -74,7 +76,7 @@ onBeforeUnmount(cleanupObserver)
       decoding="async"
     />
     <div v-else :class="fallbackClass">
-      {{ text }}
+      {{ fallbackText }}
     </div>
   </div>
 </template>
diff --git a/src/i18n/locales/en-US/ai.json b/src/i18n/locales/en-US/ai.json
index 0413963a..2a006255 100644
--- a/src/i18n/locales/en-US/ai.json
+++ b/src/i18n/locales/en-US/ai.json
@@ -270,14 +270,14 @@
     }
   },
   "global": {
-    "title": "AI Analysis",
+    "title": "AI Chat",
     "subtitle": "Query local chats across contacts and groups",
     "empty": {
       "title": "Start with a relationship",
       "description": "Select contacts or groups before asking, or search globally for a topic when you no longer remember who you discussed it with. Only the local data needed for this question is read."
     },
     "input": {
-      "placeholder": "Ask a question, optionally selecting contacts or groups first..."
+      "placeholder": "Ask a question, or type {'@'} to select contacts or groups..."
     },
     "entityPicker": {
       "title": "Select contacts or groups",
diff --git a/src/i18n/locales/ja-JP/ai.json b/src/i18n/locales/ja-JP/ai.json
index 9a178c68..dfad22bd 100644
--- a/src/i18n/locales/ja-JP/ai.json
+++ b/src/i18n/locales/ja-JP/ai.json
@@ -270,14 +270,14 @@
     }
   },
   "global": {
-    "title": "AI 分析",
+    "title": "AI チャット",
     "subtitle": "連絡先やグループを横断してローカルのチャットを検索",
     "empty": {
       "title": "関係を選んで分析を始める",
       "description": "連絡先やグループを選んで質問できます。誰と話したか忘れた話題は全体から検索できます。現在の質問に必要なローカルデータだけを読み取ります。"
     },
     "input": {
-      "placeholder": "質問を入力。先に連絡先やグループを選択できます..."
+      "placeholder": "質問を入力、または {'@'} で連絡先やグループを選択..."
     },
     "entityPicker": {
       "title": "連絡先またはグループを選択",
diff --git a/src/i18n/locales/zh-CN/ai.json b/src/i18n/locales/zh-CN/ai.json
index 6e107978..79633c4f 100644
--- a/src/i18n/locales/zh-CN/ai.json
+++ b/src/i18n/locales/zh-CN/ai.json
@@ -270,14 +270,14 @@
     }
   },
   "global": {
-    "title": "AI 分析",
+    "title": "AI 对话",
     "subtitle": "跨联系人和群聊查询本地聊天记录",
     "empty": {
       "title": "从一段关系开始分析",
       "description": "选择联系人或群聊后提问，也可以直接搜索你忘记和谁聊过的话题。只会按当前问题读取必要的本地数据。"
     },
     "input": {
-      "placeholder": "输入问题，可先选择联系人或群聊..."
+      "placeholder": "输入问题，输入 {'@'} 选择联系人或群聊..."
     },
     "entityPicker": {
       "title": "选择联系人或群聊",
diff --git a/src/i18n/locales/zh-TW/ai.json b/src/i18n/locales/zh-TW/ai.json
index d0b8bde6..cb0eefe9 100644
--- a/src/i18n/locales/zh-TW/ai.json
+++ b/src/i18n/locales/zh-TW/ai.json
@@ -270,14 +270,14 @@
     }
   },
   "global": {
-    "title": "AI 分析",
+    "title": "AI 對話",
     "subtitle": "跨聯絡人與群聊查詢本機聊天記錄",
     "empty": {
       "title": "從一段關係開始分析",
       "description": "選擇聯絡人或群聊後提問，也可以直接搜尋你忘記和誰聊過的話題。只會按目前問題讀取必要的本機資料。"
     },
     "input": {
-      "placeholder": "輸入問題，可先選擇聯絡人或群聊..."
+      "placeholder": "輸入問題，輸入 {'@'} 選擇聯絡人或群聊..."
     },
     "entityPicker": {
       "title": "選擇聯絡人或群聊",
diff --git a/src/pages/global-ai/components/GlobalEntityPicker.vue b/src/pages/global-ai/components/GlobalEntityPicker.vue
deleted file mode 100644
index 7952cb97..00000000
--- a/src/pages/global-ai/components/GlobalEntityPicker.vue
+++ /dev/null
@@ -1,324 +0,0 @@
-<script setup lang="ts">
-import { computed, onUnmounted, ref, watch } from 'vue'
-import { useI18n } from 'vue-i18n'
-import type { AIEntityRef, ContactListItem, ContactsResponse } from '@openchatlab/shared-types'
-import { useDataService } from '@/services'
-import { useSessionStore } from '@/stores/session'
-
-const props = defineProps<{
-  modelValue: AIEntityRef[]
-  disabled?: boolean
-}>()
-
-const emit = defineEmits<{
-  'update:modelValue': [value: AIEntityRef[]]
-}>()
-
-const { t } = useI18n()
-const dataService = useDataService()
-const sessionStore = useSessionStore()
-const open = ref(false)
-const activeType = ref<'contacts' | 'groups'>('contacts')
-const query = ref('')
-const contacts = ref<ContactListItem[]>([])
-const contactResponses = ref<ContactsResponse[]>([])
-const loadingContacts = ref(false)
-const contactError = ref('')
-let searchTimer: ReturnType<typeof setTimeout> | null = null
-let pollTimer: ReturnType<typeof setTimeout> | null = null
-let requestId = 0
-const CONTACTS_POLL_INTERVAL_MS = 1500
-
-const normalizedQuery = computed(() => query.value.trim().toLocaleLowerCase())
-const groups = computed(() => {
-  const list = sessionStore.sessions.filter((session) => session.type === 'group')
-  if (!normalizedQuery.value) return list
-  return list.filter((session) => session.name.toLocaleLowerCase().includes(normalizedQuery.value))
-})
-const contactsUnavailable = computed(
-  () =>
-    !loadingContacts.value &&
-    !contactError.value &&
-    contacts.value.length === 0 &&
-    contactResponses.value.some(
-      (response) => response.cache.status === 'missing' || response.task?.status === 'running'
-    )
-)
-
-function entityKey(entity: AIEntityRef): string {
-  return entity.type === 'contact' ? `contact:${entity.contactKey}` : `session:${entity.sessionId}`
-}
-
-function isSelected(entity: AIEntityRef): boolean {
-  const key = entityKey(entity)
-  return props.modelValue.some((item) => entityKey(item) === key)
-}
-
-function toggle(entity: AIEntityRef): void {
-  if (props.disabled) return
-  const key = entityKey(entity)
-  const exists = props.modelValue.some((item) => entityKey(item) === key)
-  emit(
-    'update:modelValue',
-    exists ? props.modelValue.filter((item) => entityKey(item) !== key) : [...props.modelValue, entity]
-  )
-}
-
-function remove(entity: AIEntityRef): void {
-  const key = entityKey(entity)
-  emit(
-    'update:modelValue',
-    props.modelValue.filter((item) => entityKey(item) !== key)
-  )
-}
-
-function stopContactsPolling(): void {
-  if (!pollTimer) return
-  clearTimeout(pollTimer)
-  pollTimer = null
-}
-
-function scheduleContactsPolling(responses: ContactsResponse[]): void {
-  stopContactsPolling()
-  if (!open.value || activeType.value !== 'contacts') return
-  if (!responses.some((response) => response.task?.status === 'running')) return
-
-  pollTimer = setTimeout(() => {
-    pollTimer = null
-    void loadContacts({ silent: true })
-  }, CONTACTS_POLL_INTERVAL_MS)
-}
-
-function stopPendingContactWork(): void {
-  requestId++
-  loadingContacts.value = false
-  if (searchTimer) {
-    clearTimeout(searchTimer)
-    searchTimer = null
-  }
-  stopContactsPolling()
-}
-
-async function loadContacts(loadOptions?: { silent?: boolean }): Promise<void> {
-  const currentRequest = ++requestId
-  if (!loadOptions?.silent) loadingContacts.value = true
-  contactError.value = ''
-  try {
-    const requestOptions = {
-      acceptStale: true,
-      timeRangePreset: 'all',
-      page: 1,
-      pageSize: 100,
-      query: query.value.trim() || undefined,
-    } as const
-    const responses = await Promise.all([
-      dataService.getContacts({ ...requestOptions, pool: 'friend' }),
-      dataService.getContacts({ ...requestOptions, pool: 'non_friend' }),
-    ])
-    if (currentRequest !== requestId) return
-
-    const byKey = new Map<string, ContactListItem>()
-    responses.flatMap((response) => response.contacts).forEach((contact) => byKey.set(contact.key, contact))
-    contacts.value = [...byKey.values()]
-    contactResponses.value = responses
-    scheduleContactsPolling(responses)
-  } catch (error) {
-    if (currentRequest !== requestId) return
-    stopContactsPolling()
-    contactError.value = error instanceof Error ? error.message : String(error)
-    contacts.value = []
-    contactResponses.value = []
-  } finally {
-    if (currentRequest === requestId && !loadOptions?.silent) loadingContacts.value = false
-  }
-}
-
-watch(open, (isOpen) => {
-  if (isOpen) {
-    void loadContacts()
-  } else {
-    stopPendingContactWork()
-  }
-})
-
-watch(activeType, (type) => {
-  if (!open.value) return
-  stopPendingContactWork()
-  if (type === 'contacts') void loadContacts()
-})
-
-watch(query, () => {
-  if (!open.value || activeType.value !== 'contacts') return
-  requestId++
-  if (searchTimer) clearTimeout(searchTimer)
-  stopContactsPolling()
-  searchTimer = setTimeout(() => {
-    searchTimer = null
-    void loadContacts()
-  }, 250)
-})
-
-onUnmounted(() => {
-  stopPendingContactWork()
-})
-</script>
-
-<template>
-  <div class="flex min-w-0 flex-wrap items-center gap-1.5">
-    <UPopover v-model:open="open" :ui="{ content: 'z-[80] p-0' }">
-      <button
-        type="button"
-        class="inline-flex h-7 shrink-0 items-center gap-1 rounded-full px-2 text-xs text-gray-500 transition-colors hover:bg-gray-100 hover:text-gray-700 disabled:cursor-not-allowed disabled:opacity-50 dark:text-gray-400 dark:hover:bg-gray-800 dark:hover:text-gray-200"
-        :disabled="disabled"
-        :title="t('ai.global.entityPicker.title')"
-      >
-        <span class="text-base leading-none">@</span>
-        <span>{{ t('ai.global.entityPicker.add') }}</span>
-      </button>
-
-      <template #content>
-        <div class="flex h-[390px] w-[340px] flex-col overflow-hidden">
-          <div class="border-b border-gray-200 p-3 dark:border-gray-800">
-            <div class="mb-2 flex rounded-lg bg-gray-100 p-0.5 dark:bg-gray-800">
-              <button
-                v-for="type in ['contacts', 'groups'] as const"
-                :key="type"
-                type="button"
-                class="flex-1 rounded-md px-3 py-1.5 text-xs transition-colors"
-                :class="
-                  activeType === type
-                    ? 'bg-white text-gray-900 shadow-sm dark:bg-gray-700 dark:text-white'
-                    : 'text-gray-500 dark:text-gray-400'
-                "
-                @click="activeType = type"
-              >
-                {{ t(`ai.global.entityPicker.${type}`) }}
-              </button>
-            </div>
-            <UInput
-              v-model="query"
-              icon="i-heroicons-magnifying-glass"
-              size="sm"
-              :placeholder="t('ai.global.entityPicker.search')"
-            />
-          </div>
-
-          <div class="min-h-0 flex-1 overflow-y-auto p-2">
-            <template v-if="activeType === 'contacts'">
-              <div v-if="loadingContacts" class="flex h-full items-center justify-center">
-                <UIcon name="i-lucide-loader-2" class="h-4 w-4 animate-spin text-gray-400" />
-              </div>
-              <div v-else-if="contactError" class="px-3 py-8 text-center text-xs text-red-500">
-                <p>{{ t('ai.global.entityPicker.loadFailed') }}</p>
-                <UButton size="xs" variant="link" class="mt-1" @click="loadContacts()">
-                  {{ t('common.retry') }}
-                </UButton>
-              </div>
-              <div v-else-if="contactsUnavailable" class="px-4 py-8 text-center text-xs text-gray-400">
-                {{ t('ai.global.entityPicker.contactsPreparing') }}
-              </div>
-              <div v-else-if="contacts.length === 0" class="px-4 py-8 text-center text-xs text-gray-400">
-                {{ t('ai.global.entityPicker.empty') }}
-              </div>
-              <button
-                v-for="contact in contacts"
-                v-else
-                :key="contact.key"
-                type="button"
-                class="flex w-full items-center gap-2 rounded-lg px-2.5 py-2 text-left transition-colors hover:bg-gray-100 dark:hover:bg-gray-800"
-                @click="
-                  toggle({
-                    type: 'contact',
-                    contactKey: contact.key,
-                    displayName: contact.displayName,
-                  })
-                "
-              >
-                <div
-                  class="flex h-7 w-7 shrink-0 items-center justify-center rounded-full bg-primary-50 text-xs text-primary-600 dark:bg-primary-500/10 dark:text-primary-300"
-                >
-                  {{ contact.displayName.slice(0, 1) }}
-                </div>
-                <div class="min-w-0 flex-1">
-                  <p class="truncate text-sm text-gray-700 dark:text-gray-200">{{ contact.displayName }}</p>
-                  <p class="truncate text-[11px] text-gray-400">{{ contact.platform }}</p>
-                </div>
-                <UIcon
-                  v-if="
-                    isSelected({
-                      type: 'contact',
-                      contactKey: contact.key,
-                      displayName: contact.displayName,
-                    })
-                  "
-                  name="i-heroicons-check"
-                  class="h-4 w-4 shrink-0 text-primary-500"
-                />
-              </button>
-            </template>
-
-            <template v-else>
-              <div v-if="groups.length === 0" class="px-4 py-8 text-center text-xs text-gray-400">
-                {{ t('ai.global.entityPicker.empty') }}
-              </div>
-              <button
-                v-for="session in groups"
-                :key="session.id"
-                type="button"
-                class="flex w-full items-center gap-2 rounded-lg px-2.5 py-2 text-left transition-colors hover:bg-gray-100 dark:hover:bg-gray-800"
-                @click="
-                  toggle({
-                    type: 'session',
-                    sessionId: session.id,
-                    displayName: session.name,
-                    sessionType: 'group',
-                  })
-                "
-              >
-                <div
-                  class="flex h-7 w-7 shrink-0 items-center justify-center rounded-lg bg-gray-100 text-gray-500 dark:bg-gray-800 dark:text-gray-300"
-                >
-                  <UIcon name="i-heroicons-user-group" class="h-4 w-4" />
-                </div>
-                <div class="min-w-0 flex-1">
-                  <p class="truncate text-sm text-gray-700 dark:text-gray-200">{{ session.name }}</p>
-                  <p class="text-[11px] text-gray-400">{{ session.platform }}</p>
-                </div>
-                <UIcon
-                  v-if="
-                    isSelected({
-                      type: 'session',
-                      sessionId: session.id,
-                      displayName: session.name,
-                      sessionType: 'group',
-                    })
-                  "
-                  name="i-heroicons-check"
-                  class="h-4 w-4 shrink-0 text-primary-500"
-                />
-              </button>
-            </template>
-          </div>
-        </div>
-      </template>
-    </UPopover>
-
-    <span
-      v-for="entity in modelValue"
-      :key="entityKey(entity)"
-      class="inline-flex h-7 max-w-[180px] items-center gap-1 rounded-full bg-primary-50 px-2 text-xs text-primary-700 dark:bg-primary-500/10 dark:text-primary-300"
-    >
-      <UIcon :name="entity.type === 'contact' ? 'i-heroicons-user' : 'i-heroicons-user-group'" class="h-3 w-3" />
-      <span class="truncate">{{ entity.displayName }}</span>
-      <button
-        type="button"
-        class="ml-0.5 rounded-full text-primary-400 hover:text-primary-700 dark:hover:text-primary-200"
-        :aria-label="t('common.delete')"
-        :disabled="disabled"
-        @click="remove(entity)"
-      >
-        <UIcon name="i-heroicons-x-mark" class="h-3 w-3" />
-      </button>
-    </span>
-  </div>
-</template>
diff --git a/src/pages/global-ai/index.vue b/src/pages/global-ai/index.vue
index fede9937..b7ad5f01 100644
--- a/src/pages/global-ai/index.vue
+++ b/src/pages/global-ai/index.vue
@@ -5,10 +5,11 @@ import { useRoute, useRouter } from 'vue-router'
 import type { AIEntityRef } from '@openchatlab/shared-types'
 import { getDefaultGeneralAssistantId } from '@openchatlab/shared-types'
 import ConversationList from '@/components/AIChat/chat/ConversationList.vue'
+import ChatHeaderActions from '@/components/AIChat/chat/ChatHeaderActions.vue'
 import ChatMessage from '@/components/AIChat/chat/ChatMessage.vue'
 import AIThinkingIndicator from '@/components/AIChat/chat/AIThinkingIndicator.vue'
 import ChatStatusBar from '@/components/AIChat/chat/ChatStatusBar.vue'
-import AIChatComposer from '@/components/AIChat/input/AIChatComposer.vue'
+import AIChatInput from '@/components/AIChat/input/AIChatInput.vue'
 import { useChatScroll } from '@/components/AIChat/composables/useChatScroll'
 import { useProgressiveChatHistory } from '@/components/AIChat/composables/useProgressiveChatHistory'
 import { groupMessagesToQAPairs } from '@/components/AIChat/utils/chatMessages'
@@ -18,7 +19,6 @@ import type { AIChat } from '@/services/ai/types'
 import { useAIChatStore } from '@/stores/aiChat'
 import { useLayoutStore } from '@/stores/layout'
 import { useToast } from '@/composables/useToast'
-import GlobalEntityPicker from './components/GlobalEntityPicker.vue'
 
 const { t, locale } = useI18n()
 const route = useRoute()
@@ -34,15 +34,13 @@ const currentAIChatId = toRef(state, 'currentAIChatId')
 const conversations = ref<AIChat[]>([])
 const conversationsLoading = ref(false)
 const initializing = ref(true)
-const input = ref('')
-const selectedEntities = ref<AIEntityRef[]>([])
-const isComposing = ref(false)
 let isUnmounted = false
 let conversationSelectionRequestId = 0
 
 function isGlobalPageActive(): boolean {
   return !isUnmounted && route.name === 'global-ai'
 }
+const estimatedContextTokens = ref(0)
 
 const pairs = computed(() => groupMessagesToQAPairs(messages.value))
 const { messagesContainer, showScrollToBottom, handleScrollToBottom, scrollToBottom } = useChatScroll(
@@ -90,7 +88,6 @@ async function selectConversation(aiChatId: string): Promise<void> {
     return
   }
   initializing.value = false
-  selectedEntities.value = []
   await syncAIChatIdToRoute(aiChatId)
   if (currentRequest !== conversationSelectionRequestId || !isGlobalPageActive()) return
   await nextTick()
@@ -101,8 +98,6 @@ function startNewConversation(): void {
   conversationSelectionRequestId++
   if (!aiChatStore.startNewAIChat(chatKey)) return
   initializing.value = false
-  selectedEntities.value = []
-  input.value = ''
   void syncAIChatIdToRoute(null)
 }
 
@@ -126,34 +121,22 @@ async function deleteConversation(aiChatId: string): Promise<void> {
   }
 }
 
-async function submit(): Promise<void> {
-  const content = input.value.trim()
-  if (!content || isAIThinking.value) return
-
-  const refs = selectedEntities.value.map((entity) => ({ ...entity }))
-  input.value = ''
-  selectedEntities.value = []
-  const result = await aiChatStore.sendMessage(chatKey, content, { entityRefs: refs })
-  if (result.success || result.reason === 'aborted') return
+async function handleSend(payload: { content: string; entityRefs: AIEntityRef[] }): Promise<void> {
+  const result = await aiChatStore.sendMessage(chatKey, payload.content, { entityRefs: payload.entityRefs })
+  if (result.success) {
+    scrollToBottom(true)
+    await loadConversations()
+    return
+  }
+  if (result.reason === 'aborted') return
 
   if (result.reason === 'no_config') {
-    input.value = content
-    selectedEntities.value = refs
     layoutStore.openSettings('ai', 'defaultModel')
     return
   }
   if (result.reason === 'busy') {
     toast.warn(t('ai.global.toast.busy'))
-    return
   }
-  input.value = content
-  selectedEntities.value = refs
-}
-
-function handleKeydown(event: KeyboardEvent): void {
-  if (event.key !== 'Enter' || event.shiftKey || isComposing.value) return
-  event.preventDefault()
-  void submit()
 }
 
 watch(locale, (nextLocale) => {
@@ -166,6 +149,23 @@ watch(currentAIChatId, (aiChatId, previousId) => {
   if (aiChatId) void loadConversations()
 })
 
+watch(
+  currentAIChatId,
+  async (aiChatId) => {
+    if (!aiChatId) {
+      estimatedContextTokens.value = 0
+      return
+    }
+    try {
+      const result = await aiService.estimateContextTokens(aiChatId)
+      estimatedContextTokens.value = result.success ? result.tokens : 0
+    } catch {
+      estimatedContextTokens.value = 0
+    }
+  },
+  { immediate: true }
+)
+
 watch(
   () => route.query.aiChatId,
   (value) => {
@@ -222,7 +222,15 @@ onUnmounted(() => {
       icon="i-heroicons-sparkles"
       icon-class="bg-primary-600 text-white dark:bg-primary-500 dark:text-white"
       size="compact"
-    />
+    >
+      <template #actions>
+        <ChatHeaderActions
+          :current-ai-chat-id="currentAIChatId"
+          :current-messages="messages"
+          :fallback-title="t('ai.global.title')"
+        />
+      </template>
+    </PageHeader>
 
     <div class="main-content flex min-h-0 flex-1 overflow-hidden">
       <ConversationList
@@ -327,28 +335,24 @@ onUnmounted(() => {
 
         <div class="shrink-0 px-4 pb-4">
           <div
-            class="mx-auto max-w-3xl overflow-visible rounded-2xl bg-white shadow-[0_2px_14px_rgba(0,0,0,0.04)] ring-1 ring-gray-200/60 transition-all focus-within:ring-primary-500/40 focus-within:shadow-[0_4px_20px_rgba(0,0,0,0.08)] dark:bg-page-dark dark:ring-white/5"
+            class="relative mx-auto max-w-3xl overflow-visible rounded-2xl bg-white shadow-[0_2px_14px_rgba(0,0,0,0.04)] ring-1 ring-gray-200/60 transition-all focus-within:ring-primary-500/40 focus-within:shadow-[0_4px_20px_rgba(0,0,0,0.08)] dark:bg-page-dark dark:ring-white/5"
           >
-            <div class="border-b border-gray-100 px-3 py-2 dark:border-gray-800/80">
-              <GlobalEntityPicker v-model="selectedEntities" :disabled="isAIThinking" />
-            </div>
-            <AIChatComposer
-              v-model="input"
+            <AIChatInput
+              :key="currentAIChatId || 'global-draft'"
               embedded
               :disabled="isAIThinking"
               :status="isAIThinking ? 'streaming' : 'ready'"
+              mention-scope="global"
+              :skills-enabled="false"
               :placeholder="t('ai.global.input.placeholder')"
-              :send-button-title="t('ai.chat.input.send')"
-              @submit="submit"
+              @send="handleSend"
               @stop="aiChatStore.stopGeneration(chatKey)"
-              @keydown="handleKeydown"
-              @composition-start="isComposing = true"
-              @composition-end="isComposing = false"
             />
             <ChatStatusBar
-              class="px-2 pb-1.5 pt-0.5"
+              class="pb-1.5 pl-2 pr-[52px] pt-0.5"
               :session-token-usage="state.sessionTokenUsage"
               :agent-status="state.agentStatus"
+              :estimated-context-tokens="estimatedContextTokens"
             />
           </div>
         </div>