diff --git a/frontend/src/App.vue b/frontend/src/App.vue
index 1aac7e4..7150961 100644
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -18,7 +18,7 @@ import { loadPluginFrontendModules } from './plugins/runtime'
 import { naiveThemeOverrides } from './theme/naive'
 
 const router = useRouter()
-const { locale, toggleLocale, tr } = useI18n()
+const { locale, toggleLocale, tr, translateSeededText } = useI18n()
 
 const accountOptions = computed(() => [
   { key: 'account', label: tr('账号设置', 'Account Settings') },
@@ -111,8 +111,8 @@ onBeforeUnmount(() => {
                     </NBadge>
                     <NDropdown :options="accountOptions" trigger="click" @select="onAccountSelect">
                       <button type="button" class="account-menu-trigger" :aria-label="tr('账户菜单', 'Account menu')">
-                        <AppAvatar :name="session.user.display_name" :color="session.user.avatar_color" :size="30" />
-                        <span>{{ session.user.display_name }}</span>
+                        <AppAvatar :name="translateSeededText(session.user.display_name)" :color="session.user.avatar_color" :size="30" />
+                        <span>{{ translateSeededText(session.user.display_name) }}</span>
                       </button>
                     </NDropdown>
                   </div>
diff --git a/frontend/src/components/FocusMode.vue b/frontend/src/components/FocusMode.vue
index 2fc608d..e54d230 100644
--- a/frontend/src/components/FocusMode.vue
+++ b/frontend/src/components/FocusMode.vue
@@ -13,7 +13,7 @@ import OutcomeComposer from './OutcomeComposer.vue'
 import { useI18n } from '../i18n'
 import { Check, ChevronLeft, ChevronRight } from '@lucide/vue'
 
-const { locale, tr, translateSeededText, translateNotesMarkdown } = useI18n()
+const { locale, toggleLocale, tr, translateSeededText, translateNotesMarkdown } = useI18n()
 
 const props = defineProps<{
   show: boolean
@@ -96,6 +96,7 @@ watch(() => currentItem.value, (item) => {
 }, { immediate: true })
 
 watch(locale, (nextLocale) => {
+  message.destroyAll()
   localNotes.value = translateNotesMarkdown(localNotes.value, nextLocale)
 })
 
@@ -174,6 +175,7 @@ async function persistCurrentNotes(): Promise<boolean> {
     emit('reload')
     return true
   } catch (caught) {
+    message.destroyAll()
     message.error(errorMessage(caught, tr('议题笔记保存失败', 'Failed to save agenda notes')))
     return false
   } finally {
@@ -190,16 +192,18 @@ async function completeAndAdvance() {
       method: 'POST',
       body: JSON.stringify({ expected_version: localVersion.value }),
     })
+    message.destroyAll()
     message.success(
       locale.value === 'en'
-        ? `Agenda "${currentItem.value.title}" completed`
-        : `议题「${currentItem.value.title}」已完成`,
+        ? `Agenda "${translateSeededText(currentItem.value.title, 'en')}" completed`
+        : `议题「${translateSeededText(currentItem.value.title, 'zh')}」已完成`,
     )
     emit('reload')
     if (result.next_agenda_item_id) {
       selectedAgendaId.value = result.next_agenda_item_id
     }
   } catch (caught) {
+    message.destroyAll()
     message.error(errorMessage(caught, tr('完成议题失败', 'Failed to complete agenda item')))
   } finally {
     advancing.value = false
@@ -232,6 +236,7 @@ async function smartExtractFocusNotes() {
     const decisions = res.decisions ?? res.extracted?.decisions ?? 0
     const actions = res.actions ?? res.extracted?.actions ?? 0
     const questions = res.questions ?? res.extracted?.questions ?? 0
+    message.destroyAll()
     message.success(
       locale.value === 'en'
         ? `Extracted ${decisions} decisions, ${actions} actions, and ${questions} open questions`
@@ -239,6 +244,7 @@ async function smartExtractFocusNotes() {
     )
     emit('reload')
   } catch (caught) {
+    message.destroyAll()
     message.error(errorMessage(caught, tr('AI 提炼失败，请检查笔记标签格式', 'AI extraction failed, please check notes format')))
   } finally {
     extracting.value = false
@@ -270,6 +276,7 @@ async function toggleActionStatus(action: ActionItem, targetStatus?: ActionStatu
     })
     action.status = updated.status
     action.version = updated.version
+    message.destroyAll()
     message.success(
       locale.value === 'en'
         ? `Action status updated to: ${actionStatusLabel(nextStatus)}`
@@ -277,6 +284,7 @@ async function toggleActionStatus(action: ActionItem, targetStatus?: ActionStatu
     )
     emit('reload')
   } catch (caught) {
+    message.destroyAll()
     message.error(errorMessage(caught, tr('更新行动项失败', 'Failed to update action item')))
   }
 }
@@ -400,6 +408,16 @@ const noteActionTags = computed(() => {
           {{ saving ? tr('保存中…', 'Saving…') : tr('保存笔记', 'Save Notes') }}
         </button>
 
+        <button
+          type="button"
+          class="focus-lang-btn"
+          data-testid="focus-lang-toggle"
+          :aria-label="tr('切换语言', 'Switch Language')"
+          @click="toggleLocale"
+        >
+          🌐 {{ locale === 'zh' ? 'EN' : '中文' }}
+        </button>
+
         <button type="button" class="focus-exit-btn" @click="exitFocus" :title="tr('退出专注模式 (Esc)', 'Exit Focus Mode (Esc)')">
           {{ tr('退出专注', 'Exit Focus') }} <kbd>Esc</kbd>
         </button>
@@ -780,6 +798,28 @@ const noteActionTags = computed(() => {
   font-family: inherit;
 }
 
+.focus-lang-btn {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  padding: 6px 10px;
+  border-radius: 8px;
+  border: 1px solid #cbd5e1;
+  background: white;
+  color: #334155;
+  font-size: 0.8rem;
+  font-weight: 600;
+  cursor: pointer;
+  transition: all 0.15s;
+  white-space: nowrap;
+  flex-shrink: 0;
+}
+
+.focus-lang-btn:hover {
+  background: #f1f5f9;
+  border-color: #94a3b8;
+}
+
 .focus-exit-btn {
   display: inline-flex;
   align-items: center;
@@ -836,18 +876,24 @@ const noteActionTags = computed(() => {
 .agenda-title-row {
   display: flex;
   align-items: baseline;
+  justify-content: space-between;
   gap: 12px;
   margin-bottom: 6px;
 }
 
 .focus-agenda-title {
   margin: 0;
-  font-size: 1.65rem;
+  flex: 1;
+  min-width: 0;
+  overflow-wrap: anywhere;
+  font-size: 1.5rem;
   font-weight: 800;
   color: #0f172a;
 }
 
 .focus-agenda-type {
+  flex-shrink: 0;
+  white-space: nowrap;
   font-size: 0.78rem;
   color: #64748b;
   font-weight: 600;
diff --git a/frontend/src/components/MarkdownEditor.vue b/frontend/src/components/MarkdownEditor.vue
index 00d7cd1..3d0ac76 100644
--- a/frontend/src/components/MarkdownEditor.vue
+++ b/frontend/src/components/MarkdownEditor.vue
@@ -1,5 +1,7 @@
 <script setup lang="ts">
 import { Crepe } from '@milkdown/crepe'
+import { placeholderConfig } from '@milkdown/crepe/feature/placeholder'
+import { editorViewCtx } from '@milkdown/kit/core'
 
 export type MarkdownEditorHandle = { flush: () => string }
 import { getMarkdown, replaceAll } from '@milkdown/kit/utils'
@@ -80,6 +82,26 @@ watch(() => props.disabled, (value) => {
   if (ready) editor?.setReadonly(value)
 })
 
+watch(effectivePlaceholder, (nextText) => {
+  if (ready && editor) {
+    try {
+      editor.editor.action((ctx) => {
+        ctx.update(placeholderConfig.key, (prev) => ({
+          ...prev,
+          text: nextText,
+        }))
+        const view = ctx.get(editorViewCtx)
+        view.dispatch(view.state.tr)
+      })
+    } catch {
+      // Fallback to direct DOM attribute update below
+    }
+  }
+  root.value?.querySelectorAll('.crepe-placeholder, [data-placeholder]').forEach((el) => {
+    el.setAttribute('data-placeholder', nextText)
+  })
+})
+
 watch(() => props.modelValue, (value) => {
   if (!ready || !editor || value === latestMarkdown) return
   latestMarkdown = value
diff --git a/frontend/src/components/MeetingCreateDrawer.vue b/frontend/src/components/MeetingCreateDrawer.vue
index 0f71440..596d1d4 100644
--- a/frontend/src/components/MeetingCreateDrawer.vue
+++ b/frontend/src/components/MeetingCreateDrawer.vue
@@ -10,7 +10,7 @@ import { useI18n } from '../i18n'
 import { errorMessage } from '../utils/errors'
 import MeetingParticipantEditor from './MeetingParticipantEditor.vue'
 
-const { tr } = useI18n()
+const { tr, translateSeededText } = useI18n()
 
 type ProjectOption = { id: string; name: string }
 type ParticipantValue = { user_id: string; participation_role: ParticipationRole }
@@ -40,7 +40,7 @@ const form = ref({
 })
 
 const projectOptions = computed(() => props.projects.map((project) => ({
-  label: project.name,
+  label: translateSeededText(project.name),
   value: project.id,
 })))
 
diff --git a/frontend/src/components/ProjectActivityTab.vue b/frontend/src/components/ProjectActivityTab.vue
index ede598e..e731f18 100644
--- a/frontend/src/components/ProjectActivityTab.vue
+++ b/frontend/src/components/ProjectActivityTab.vue
@@ -15,7 +15,7 @@ import PluginEditorSlot from './PluginEditorSlot.vue'
 import ProjectUpdateComposer from './ProjectUpdateComposer.vue'
 import VersionConflictDialog from './VersionConflictDialog.vue'
 
-const { tr } = useI18n()
+const { tr, translateSeededText, translateNotesMarkdown } = useI18n()
 
 const props = defineProps<{ project: ProjectDetail; canContribute: boolean }>()
 const emit = defineEmits<{ reload: [] }>()
@@ -45,7 +45,8 @@ const editForm = ref({ health: 'unset' as Health, content_markdown: '' })
 const conflictServer = ref<ProjectUpdate | null>(null)
 
 function actorName(item: ProjectActivityItem) {
-  return item.actor?.display_name || item.actor?.username || tr('系统', 'System')
+  const raw = item.actor?.display_name || item.actor?.username
+  return raw ? translateSeededText(raw) : tr('系统', 'System')
 }
 
 async function loadActivity(before?: number) {
@@ -217,8 +218,7 @@ onMounted(() => {
     <NTimeline v-if="activityItems.length" class="project-activity-timeline">
       <NTimelineItem v-for="item in activityItems" :key="item.id" :time="formatDateTime(item.created_at)">
         <p class="activity-entry">
-          <strong>{{ actorName(item) }}</strong>
-          <span>{{ activityLabel(item.event_type, item.payload) }}</span>
+          <strong style="margin-right: 6px">{{ actorName(item) }}</strong><span>{{ activityLabel(item.event_type, item.payload) }}</span>
         </p>
         <div v-if="canContribute && item.subject.type === 'project_update'" class="row-actions">
           <button class="button button-quiet" type="button" :aria-label="tr(`编辑进展 ${item.subject.id}`, `Edit update ${item.subject.id}`)" @click="openUpdateEdit(item)">{{ tr('编辑', 'Edit') }}</button>
@@ -235,9 +235,9 @@ onMounted(() => {
       <header class="section-heading"><h3>{{ tr('进展记录', 'Progress History') }}</h3></header>
       <div v-if="updates.length" class="project-activity-list">
         <article v-for="item in updates" :key="item.id" class="latest-update">
-          <MarkdownView :source="item.content_markdown" />
+          <MarkdownView :source="translateNotesMarkdown(item.content_markdown)" />
           <p class="attribution">
-            {{ item.created_by?.display_name || item.created_by?.username || tr('系统', 'System') }} · {{ formatDateTime(item.created_at) }}
+            {{ item.created_by ? translateSeededText(item.created_by.display_name || item.created_by.username) : tr('系统', 'System') }} · {{ formatDateTime(item.created_at) }}
             <template v-if="item.source === 'ai_draft_applied'"> · {{ tr('AI 草稿', 'AI Draft') }}</template>
           </p>
         </article>
diff --git a/frontend/src/components/ProjectQuestionsTab.vue b/frontend/src/components/ProjectQuestionsTab.vue
index 84c9bea..443752b 100644
--- a/frontend/src/components/ProjectQuestionsTab.vue
+++ b/frontend/src/components/ProjectQuestionsTab.vue
@@ -10,7 +10,7 @@ import type { ProjectDetail } from '../domain/projects'
 import { useI18n } from '../i18n'
 import { errorMessage } from '../utils/errors'
 
-const { tr } = useI18n()
+const { tr, translateSeededText } = useI18n()
 
 type MeetingOption = { id: string; title: string; scheduled_start: string; status: string; version?: number }
 
@@ -43,22 +43,23 @@ const resolveSaving = ref(false)
 const resolveError = ref('')
 
 const memberOptions = computed(() => props.project.memberships.map((row) => ({
-  label: row.user.display_name || row.user.username,
+  label: translateSeededText(row.user.display_name || row.user.username),
   value: row.user.id,
 })))
 const scheduleOptions = computed(() => scheduleMeetings.value.map((meeting) => ({
-  label: `${meeting.title} · ${meeting.scheduled_start.slice(0, 10)}`,
+  label: `${translateSeededText(meeting.title)} · ${meeting.scheduled_start.slice(0, 10)}`,
   value: meeting.id,
 })))
 const resolveDecisionOptions = computed(() => resolveDecisions.value.map((decision) => ({
-  label: decision.title,
+  label: translateSeededText(decision.title),
   value: decision.id,
 })))
 
 function ownerName(userId: string | null | undefined) {
   if (!userId) return tr('未指派', 'Unassigned')
   const row = props.project.memberships.find((item) => item.user.id === userId)
-  return row?.user.display_name || row?.user.username || tr('未指派', 'Unassigned')
+  const raw = row?.user.display_name || row?.user.username
+  return raw ? translateSeededText(raw) : tr('未指派', 'Unassigned')
 }
 
 async function load() {
@@ -242,7 +243,7 @@ onMounted(load)
     <div v-else-if="questions.length" class="project-record-list">
       <div v-for="item in questions" :key="item.id" class="project-record-row question-row">
         <div class="question-row-main">
-          <strong>{{ item.question_markdown }}</strong>
+          <strong>{{ translateSeededText(item.question_markdown) }}</strong>
           <span>
             <StatusPill :status="item.status" kind="question" />
             · {{ ownerName(item.owner_user_id) }}
@@ -259,12 +260,12 @@ onMounted(load)
           </span>
         </div>
         <div v-if="canContribute && !item.is_derived" class="row-actions">
-          <button class="button button-quiet" type="button" :aria-label="tr(`编辑开放问题“${item.question_markdown}”`, `Edit question &quot;${item.question_markdown}&quot;`)" @click="openEdit(item)">{{ tr('编辑', 'Edit') }}</button>
+          <button class="button button-quiet" type="button" :aria-label="tr(`编辑开放问题“${translateSeededText(item.question_markdown)}”`, `Edit question &quot;${translateSeededText(item.question_markdown)}&quot;`)" @click="openEdit(item)">{{ tr('编辑', 'Edit') }}</button>
           <button
             v-if="item.status === 'open' && !item.scheduled_meeting_id"
             class="button button-primary"
             type="button"
-            :aria-label="tr(`排期开放问题“${item.question_markdown}”`, `Schedule question &quot;${item.question_markdown}&quot;`)"
+            :aria-label="tr(`排期开放问题“${translateSeededText(item.question_markdown)}”`, `Schedule question &quot;${translateSeededText(item.question_markdown)}&quot;`)"
             @click="openSchedule(item)"
           >
             {{ tr('排期', 'Schedule') }}
@@ -273,7 +274,7 @@ onMounted(load)
             v-if="canResolve(item)"
             class="button button-quiet"
             type="button"
-            :aria-label="tr(`解决开放问题“${item.question_markdown}”`, `Resolve question &quot;${item.question_markdown}&quot;`)"
+            :aria-label="tr(`解决开放问题“${translateSeededText(item.question_markdown)}”`, `Resolve question &quot;${translateSeededText(item.question_markdown)}&quot;`)"
             @click="openResolve(item)"
           >
             {{ tr('解决', 'Resolve') }}
diff --git a/frontend/src/components/ProjectRecordTabs.vue b/frontend/src/components/ProjectRecordTabs.vue
index 5e187c3..79b381f 100644
--- a/frontend/src/components/ProjectRecordTabs.vue
+++ b/frontend/src/components/ProjectRecordTabs.vue
@@ -18,7 +18,7 @@ import type { ActionStatus, Decision } from '../domain/outcomes'
 import type { Page } from '../api/contracts'
 import type { ProjectActionSummary, ProjectDetail } from '../domain/projects'
 
-const { tr } = useI18n()
+const { tr, translateSeededText } = useI18n()
 
 type Tab = 'meetings' | 'actions' | 'decisions' | 'files'
 type MeetingRow = { id: string; title: string; scheduled_start: string; status: string }
@@ -53,7 +53,7 @@ const occurrenceError = ref('')
 
 const memberRefs = () => props.project.memberships.map((row) => row.user)
 const userNames = computed<Record<string, string>>(() => Object.fromEntries(
-  props.project.memberships.map((row) => [row.user.id, row.user.display_name || row.user.username]),
+  props.project.memberships.map((row) => [row.user.id, translateSeededText(row.user.display_name || row.user.username)]),
 ))
 
 function endpoint() {
@@ -89,7 +89,8 @@ function seriesSaved() {
 function ownerName(userId: string | null) {
   if (!userId) return tr('未指派', 'Unassigned')
   const row = props.project.memberships.find((item) => item.user.id === userId)
-  return row?.user.display_name || row?.user.username || tr('未指派', 'Unassigned')
+  const raw = row?.user.display_name || row?.user.username
+  return raw ? translateSeededText(raw) : tr('未指派', 'Unassigned')
 }
 
 function openActionEdit(item: ProjectActionSummary) {
@@ -155,7 +156,7 @@ async function archiveSeries(series: SeriesRow) {
 function openOccurrence(series: SeriesRow) {
   if (!props.canContribute) return
   occurrenceSeries.value = series
-  occurrenceTitle.value = `${series.title} · ${tr('临时会议', 'Ad-hoc Meeting')}`
+  occurrenceTitle.value = `${translateSeededText(series.title)} · ${tr('临时会议', 'Ad-hoc Meeting')}`
   occurrenceStart.value = ''
   occurrenceEnd.value = ''
   occurrenceError.value = ''
@@ -199,22 +200,22 @@ onMounted(load)
       </header>
       <div v-if="project.series_summaries.length" class="project-dashboard-list">
         <div v-for="series in project.series_summaries as SeriesRow[]" :key="series.id" class="compact-row series-row">
-          <RouterLink :to="`/meetings?series_id=${series.id}`"><strong>{{ series.title }}</strong><span>{{ series.recurrence_description || series.status }}</span></RouterLink>
+          <RouterLink :to="`/meetings?series_id=${series.id}`"><strong>{{ translateSeededText(series.title) }}</strong><span>{{ translateSeededText(series.recurrence_description || series.status) }}</span></RouterLink>
           <div v-if="canContribute" class="row-actions">
-            <button class="button button-quiet" type="button" :aria-label="tr(`编辑系列“${series.title}”`, `Edit series &quot;${series.title}&quot;`)" @click="openSeriesEdit(series)">{{ tr('编辑', 'Edit') }}</button>
+            <button class="button button-quiet" type="button" :aria-label="tr(`编辑系列“${translateSeededText(series.title)}”`, `Edit series &quot;${translateSeededText(series.title)}&quot;`)" @click="openSeriesEdit(series)">{{ tr('编辑', 'Edit') }}</button>
             <n-popconfirm :positive-text="tr('确认', 'Confirm')" :negative-text="tr('取消', 'Cancel')" @positive-click="archiveSeries(series)">
               <template #trigger>
-                <button class="button button-quiet" type="button" :aria-label="tr(`归档系列“${series.title}”`, `Archive series &quot;${series.title}&quot;`)" :disabled="archivingId === series.id">{{ tr('归档', 'Archive') }}</button>
+                <button class="button button-quiet" type="button" :aria-label="tr(`归档系列“${translateSeededText(series.title)}”`, `Archive series &quot;${translateSeededText(series.title)}&quot;`)" :disabled="archivingId === series.id">{{ tr('归档', 'Archive') }}</button>
               </template>
-              {{ tr(`确定归档系列“${series.title}”吗？`, `Archive series "${series.title}"?`) }}
+              {{ tr(`确定归档系列“${translateSeededText(series.title)}”吗？`, `Archive series "${translateSeededText(series.title)}"?`) }}
             </n-popconfirm>
-            <button class="button button-quiet" type="button" :aria-label="tr(`临时添加会议“${series.title}”`, `Add ad-hoc meeting to &quot;${series.title}&quot;`)" @click="openOccurrence(series)">{{ tr('临时添加会议', 'Add Occurrence') }}</button>
+            <button class="button button-quiet" type="button" :aria-label="tr(`临时添加会议“${translateSeededText(series.title)}”`, `Add ad-hoc meeting to &quot;${translateSeededText(series.title)}&quot;`)" @click="openOccurrence(series)">{{ tr('临时添加会议', 'Add Occurrence') }}</button>
           </div>
         </div>
       </div>
       <p v-if="loading" class="muted">{{ tr('正在加载会议…', 'Loading meetings…') }}</p>
       <div class="project-record-list">
-        <RouterLink v-for="item in rows as MeetingRow[]" :key="item.id" class="project-record-row" :to="`/meetings/${item.id}`"><strong>{{ item.title }}</strong><span>{{ formatDateTime(item.scheduled_start) }} · <StatusPill :status="item.status" kind="meeting" /></span></RouterLink>
+        <RouterLink v-for="item in rows as MeetingRow[]" :key="item.id" class="project-record-row" :to="`/meetings/${item.id}`"><strong>{{ translateSeededText(item.title) }}</strong><span>{{ formatDateTime(item.scheduled_start) }} · <StatusPill :status="item.status" kind="meeting" /></span></RouterLink>
       </div>
     </template>
 
@@ -224,19 +225,19 @@ onMounted(load)
       <div class="project-record-list action-list">
         <div v-for="item in rows as ProjectActionSummary[]" :key="item.id" class="project-record-row action-row">
           <div class="action-row-main">
-            <strong>{{ item.content }}</strong>
+            <strong>{{ translateSeededText(item.content) }}</strong>
             <span><StatusPill :status="item.status" kind="action" /> · {{ ownerName(item.owner_user_id) }} · {{ item.due_date ?? tr('未设期限', 'No due date') }} · {{ priorityLabel(item.priority) }}</span>
             <span v-if="item.completed_at" class="muted">{{ tr('完成于 ', 'Completed ') }}{{ formatDateTime(item.completed_at) }}</span>
           </div>
           <div v-if="canContribute && !item.is_derived" class="row-actions">
-            <button class="button button-quiet" type="button" :aria-label="tr(`编辑行动项“${item.content}”`, `Edit action &quot;${item.content}&quot;`)" :disabled="actionBusy === item.id" @click="openActionEdit(item)">{{ tr('编辑', 'Edit') }}</button>
-            <button v-if="item.status === 'open'" class="button button-primary" type="button" :aria-label="tr(`开始行动项“${item.content}”`, `Start action &quot;${item.content}&quot;`)" :disabled="actionBusy === item.id" @click="transitionAction(item, 'in_progress')">{{ tr('开始', 'Start') }}</button>
-            <button v-if="item.status === 'in_progress'" class="button button-primary" type="button" :aria-label="tr(`完成行动项“${item.content}”`, `Complete action &quot;${item.content}&quot;`)" :disabled="actionBusy === item.id" @click="transitionAction(item, 'done')">{{ tr('完成', 'Complete') }}</button>
+            <button class="button button-quiet" type="button" :aria-label="tr(`编辑行动项“${translateSeededText(item.content)}”`, `Edit action &quot;${translateSeededText(item.content)}&quot;`)" :disabled="actionBusy === item.id" @click="openActionEdit(item)">{{ tr('编辑', 'Edit') }}</button>
+            <button v-if="item.status === 'open'" class="button button-primary" type="button" :aria-label="tr(`开始行动项“${translateSeededText(item.content)}”`, `Start action &quot;${translateSeededText(item.content)}&quot;`)" :disabled="actionBusy === item.id" @click="transitionAction(item, 'in_progress')">{{ tr('开始', 'Start') }}</button>
+            <button v-if="item.status === 'in_progress'" class="button button-primary" type="button" :aria-label="tr(`完成行动项“${translateSeededText(item.content)}”`, `Complete action &quot;${translateSeededText(item.content)}&quot;`)" :disabled="actionBusy === item.id" @click="transitionAction(item, 'done')">{{ tr('完成', 'Complete') }}</button>
             <n-popconfirm v-if="item.status === 'open' || item.status === 'in_progress'" :positive-text="tr('确认', 'Confirm')" :negative-text="tr('取消', 'Cancel')" @positive-click="transitionAction(item, 'canceled')">
               <template #trigger>
-                <button class="button button-quiet" type="button" :aria-label="tr(`取消行动项“${item.content}”`, `Cancel action &quot;${item.content}&quot;`)" :disabled="actionBusy === item.id">{{ tr('取消', 'Cancel') }}</button>
+                <button class="button button-quiet" type="button" :aria-label="tr(`取消行动项“${translateSeededText(item.content)}”`, `Cancel action &quot;${translateSeededText(item.content)}&quot;`)" :disabled="actionBusy === item.id">{{ tr('取消', 'Cancel') }}</button>
               </template>
-              {{ tr(`确定取消行动项“${item.content}”吗？`, `Cancel action item "${item.content}"?`) }}
+              {{ tr(`确定取消行动项“${translateSeededText(item.content)}”吗？`, `Cancel action item "${translateSeededText(item.content)}"?`) }}
             </n-popconfirm>
           </div>
         </div>
@@ -249,8 +250,8 @@ onMounted(load)
       <p v-if="loading" class="muted">{{ tr('正在加载决策…', 'Loading decisions…') }}</p>
       <div class="project-record-list">
         <div v-for="item in rows as Decision[]" :key="item.id" class="project-record-row decision-row">
-          <button type="button" class="decision-open" :aria-label="tr(`查看决策“${item.title}”`, `View decision &quot;${item.title}&quot;`)" @click="openDecision(item)">
-            <strong>{{ item.title }}</strong>
+          <button type="button" class="decision-open" :aria-label="tr(`查看决策“${translateSeededText(item.title)}”`, `View decision &quot;${translateSeededText(item.title)}&quot;`)" @click="openDecision(item)">
+            <strong>{{ translateSeededText(item.title) }}</strong>
             <span><StatusPill :status="item.status" kind="decision" /></span>
           </button>
           <RouterLink v-if="item.meeting_id" class="decision-source" :to="`/meetings/${item.meeting_id}`">{{ tr('来源会议', 'Source Meeting') }}</RouterLink>
diff --git a/frontend/src/i18n/index.ts b/frontend/src/i18n/index.ts
index 494a80a..fa4a069 100644
--- a/frontend/src/i18n/index.ts
+++ b/frontend/src/i18n/index.ts
@@ -258,6 +258,16 @@ export const SEEDED_ZH_TO_EN: Record<string, string> = {
   'iCal 日历订阅与飞书/钉钉群卡片推送': 'iCal Calendar Subscription & Feishu/DingTalk Cards',
   '默认启用 RFC 5545 签名日历订阅源': 'Enable RFC 5545 signed calendar subscription feeds by default',
   '完成飞书与钉钉交互卡片回归验证': 'Complete Feishu and DingTalk interactive card regression verification',
+  '分布式缓存容灾演练与网关限流压测': 'Distributed Cache DR Drill & Gateway Rate-Limit Stress Test',
+  '启用 Redis Sentinel 自动主从切换方案': 'Enable Redis Sentinel Automatic Failover Plan',
+  '完成网关限流压测脚本验证': 'Complete Gateway Rate-Limit Stress Test Script Verification',
+  '跨机房专线延迟峰值如何兜底？': 'How to Mitigate Cross-DC Dedicated Line Latency Spikes?',
+  '把聚焦模式补齐键盘快捷键与中英双语切换支持': 'Complete keyboard shortcuts and bilingual switching support for Focus Mode',
+  '周会例行同步': 'Weekly Sync',
+  '双周架构评审': 'Bi-weekly Architecture Review',
+  '每周三 10:00 固定同步': 'Every Wednesday at 10:00',
+  '确认采用页内 ✨ AI 智能提炼直接写入当前议题记录，彻底移除冗余弹窗':
+    'Confirm in-place ✨ AI Smart Extract directly in agenda notes, removing redundant modals',
 }
 
 export const SEEDED_EN_TO_ZH: Record<string, string> = Object.fromEntries(
diff --git a/frontend/src/styles.css b/frontend/src/styles.css
index e345000..7f85d68 100644
--- a/frontend/src/styles.css
+++ b/frontend/src/styles.css
@@ -286,7 +286,7 @@ input:focus, textarea:focus, select:focus { border-color: var(--green); box-shad
 @media (max-width: 900px) { .project-state-metrics { grid-template-columns: 1fr 1fr; } }
 .markdown-editor { min-height: 180px; overflow: hidden; border: 1px solid #dfe3e8; border-radius: 10px; background: white; }.markdown-editor:focus-within { border-color: #8295af; box-shadow: 0 0 0 3px rgba(91,112,143,.11); }.markdown-editor[data-disabled] { background: #f4f5f7; }.markdown-editor-root { min-height: 180px; }.markdown-editor .milkdown { min-height: 180px; }.markdown-editor .ProseMirror { min-height: 140px; padding: 18px 20px; outline: none; }
 .conflict-modal footer { display: flex; align-items: center; gap: 10px; }.conflict-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 20px 0; }.conflict-columns article { min-width: 0; padding: 14px; border: 1px solid #e0e4e9; border-radius: 10px; }.conflict-columns h3 { margin: 0 0 9px; }.conflict-columns pre { max-height: 320px; margin: 0; overflow: auto; white-space: pre-wrap; overflow-wrap: anywhere; font: .8rem/1.6 ui-monospace, monospace; }
-.agenda-workbench { display: grid; grid-template-columns: minmax(0, 1fr) 268px; gap: 0; align-items: stretch; padding: 0; }.agenda-detail, .agenda-empty-compact { min-width: 0; padding: 20px; }.agenda-queue { min-width: 0; padding: 18px; border-left: 1px solid #e1e6eb; }.agenda-queue .section-heading { align-items: flex-start; }.agenda-add-form { margin: 16px 0; padding: 13px; border-radius: 10px; background: #f4f6f8; }.agenda-queue-list { display: grid; gap: 7px; margin-top: 16px; }.agenda-queue-row { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; border: 1px solid #e2e6eb; border-radius: 10px; background: white; }.agenda-queue-row.selected { border-color: #779078; box-shadow: 0 0 0 2px rgba(14,107,77,.08); }.agenda-select { min-width: 0; display: flex; align-items: center; gap: 10px; padding: 12px 8px 12px 12px; border: 0; color: inherit; background: transparent; text-align: left; cursor: pointer; }.agenda-select > span:last-child { min-width: 0; display: grid; gap: 3px; }.agenda-select strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }.agenda-select small { color: #7b8490; white-space: nowrap; }.agenda-index { flex: 0 0 auto; width: 24px; height: 24px; display: grid; place-items: center; border-radius: 7px; color: #526274; background: #edf1f5; font-size: .72rem; font-weight: 800; }.agenda-menu { position: relative; margin-right: 6px; }.agenda-menu-trigger { padding: 8px; border: 0; color: #77808c; background: transparent; cursor: pointer; }.agenda-guard { grid-column: 1 / -1; display: grid; gap: 6px; padding: 10px; border-top: 1px solid #f0d3ce; color: #8d312a; font-size: .72rem; }.agenda-detail-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; }.agenda-detail-header > div:first-child { min-width: 0; flex: 1; }.agenda-detail-status { flex: 0 0 auto; }.agenda-title-input { width: 100%; min-height: 44px; padding: 0; border: 0; border-radius: 0; background: transparent; box-shadow: none; font-size: clamp(1.25rem, 2.1vw, 1.75rem); font-weight: 800; letter-spacing: -.03em; }.agenda-meta-fields, .outcome-fields { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px; margin: 18px 0; }.agenda-notes { margin-top: 18px; }.agenda-save-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 12px; }.agenda-save-row > span { font-size: .78rem; line-height: 1.45; }.agenda-save-row > .button { flex-shrink: 0; white-space: nowrap; }.agenda-outcomes { margin-top: 30px; padding-top: 24px; border-top: 1px solid #e5e8ec; }.outcome-action-group, .agenda-flow-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; }.outcome-list { display: grid; gap: 8px; margin-top: 14px; }.outcome-list article { display: grid; grid-template-columns: 82px 1fr; gap: 10px; padding: 11px; border-radius: 9px; background: #f5f7f8; }.outcome-list article span { color: #74808e; font-size: .72rem; white-space: nowrap; }.outcome-composer { margin-top: 16px; padding: 18px; border: 1px solid #dce2e8; border-radius: 11px; background: #fafbfc; }.outcome-composer .markdown-editor, .outcome-composer .markdown-editor-root, .outcome-composer .markdown-editor .milkdown { min-height: 120px; }.agenda-flow-actions { margin-top: 30px; padding-top: 18px; border-top: 1px solid #e5e8ec; }
+.agenda-workbench { display: grid; grid-template-columns: minmax(0, 1fr) 252px; gap: 0; align-items: stretch; padding: 0; }.agenda-detail, .agenda-empty-compact { min-width: 0; padding: 20px; }.agenda-queue { min-width: 0; padding: 18px; border-left: 1px solid #e1e6eb; }.agenda-queue .section-heading { align-items: flex-start; }.agenda-add-form { margin: 16px 0; padding: 13px; border-radius: 10px; background: #f4f6f8; }.agenda-queue-list { display: grid; gap: 7px; margin-top: 16px; }.agenda-queue-row { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; border: 1px solid #e2e6eb; border-radius: 10px; background: white; }.agenda-queue-row.selected { border-color: #779078; box-shadow: 0 0 0 2px rgba(14,107,77,.08); }.agenda-select { min-width: 0; display: flex; align-items: center; gap: 10px; padding: 12px 8px 12px 12px; border: 0; color: inherit; background: transparent; text-align: left; cursor: pointer; }.agenda-select > span:last-child { min-width: 0; display: grid; gap: 3px; }.agenda-select strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }.agenda-select small { color: #7b8490; white-space: nowrap; }.agenda-index { flex: 0 0 auto; width: 24px; height: 24px; display: grid; place-items: center; border-radius: 7px; color: #526274; background: #edf1f5; font-size: .72rem; font-weight: 800; }.agenda-menu { position: relative; margin-right: 6px; }.agenda-menu-trigger { padding: 8px; border: 0; color: #77808c; background: transparent; cursor: pointer; }.agenda-guard { grid-column: 1 / -1; display: grid; gap: 6px; padding: 10px; border-top: 1px solid #f0d3ce; color: #8d312a; font-size: .72rem; }.agenda-detail-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; }.agenda-detail-header > div:first-child { min-width: 0; flex: 1; }.agenda-detail-status { flex: 0 0 auto; }.agenda-title-input { width: 100%; min-height: 44px; padding: 0; border: 0; border-radius: 0; background: transparent; box-shadow: none; font-size: clamp(1.08rem, 1.38vw, 1.32rem); font-weight: 800; letter-spacing: -.03em; text-overflow: ellipsis; }.agenda-meta-fields, .outcome-fields { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px; margin: 18px 0; }.agenda-notes { margin-top: 18px; }.agenda-save-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 12px; }.agenda-save-row > span { font-size: .78rem; line-height: 1.45; }.agenda-save-row > .button { flex-shrink: 0; white-space: nowrap; }.agenda-outcomes { margin-top: 30px; padding-top: 24px; border-top: 1px solid #e5e8ec; }.outcome-action-group, .agenda-flow-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; }.outcome-list { display: grid; gap: 8px; margin-top: 14px; }.outcome-list article { display: grid; grid-template-columns: 82px 1fr; gap: 10px; padding: 11px; border-radius: 9px; background: #f5f7f8; }.outcome-list article span { color: #74808e; font-size: .72rem; white-space: nowrap; }.outcome-composer { margin-top: 16px; padding: 18px; border: 1px solid #dce2e8; border-radius: 11px; background: #fafbfc; }.outcome-composer .markdown-editor, .outcome-composer .markdown-editor-root, .outcome-composer .markdown-editor .milkdown { min-height: 120px; }.agenda-flow-actions { margin-top: 30px; padding-top: 18px; border-top: 1px solid #e5e8ec; }
 .ai-inline-extract-btn { display: inline-flex; align-items: center; gap: 4px; height: 26px; padding: 0 10px; border: 1px solid #b8d7c4; border-radius: 6px; color: var(--green-dark); background: #edf7f1; cursor: pointer; font-size: .74rem; font-weight: 750; white-space: nowrap; flex-shrink: 0; transition: background .15s ease, border-color .15s ease, box-shadow .15s ease; }
 .ai-inline-extract-btn:hover:not(:disabled) { background: #dcebe6; border-color: var(--green); }
 .ai-inline-extract-btn:disabled { cursor: wait; opacity: .65; }
diff --git a/frontend/src/tests/focus-and-integrations.test.ts b/frontend/src/tests/focus-and-integrations.test.ts
index d0045b0..21a21c3 100644
--- a/frontend/src/tests/focus-and-integrations.test.ts
+++ b/frontend/src/tests/focus-and-integrations.test.ts
@@ -204,6 +204,14 @@ describe('P0 Features: Bidirectional Actions, Focus Mode, Calendar & Webhooks',
     // Verify syntax guide shows @开放问题: 待确认
     expect(screen.getByText('@开放问题: 待确认')).toBeInTheDocument()
 
+    // Verify language switcher button inside Focus Mode header
+    const langBtn = screen.getByTestId('focus-lang-toggle')
+    expect(langBtn).toBeInTheDocument()
+    await fireEvent.click(langBtn)
+    expect(screen.getByText('Live Outcomes')).toBeInTheDocument()
+    await fireEvent.click(langBtn)
+    expect(screen.getByText('实时决议与待办')).toBeInTheDocument()
+
     // Test advance button
     const advanceBtn = screen.getByRole('button', { name: /完成并下一项/ })
     await fireEvent.click(advanceBtn)
diff --git a/frontend/src/tests/project-activity.test.ts b/frontend/src/tests/project-activity.test.ts
index b7a2df0..92b61e7 100644
--- a/frontend/src/tests/project-activity.test.ts
+++ b/frontend/src/tests/project-activity.test.ts
@@ -193,4 +193,33 @@ describe('project activity ledger', () => {
     expect(screen.queryByRole('button', { name: '发布进展' })).not.toBeInTheDocument()
     expect(screen.queryByRole('button', { name: '编辑进展 up1' })).not.toBeInTheDocument()
   })
+
+  it('localizes meeting.notes_ingested and translates seeded subjects across zh and en', async () => {
+    const { setLocale } = await import('../i18n')
+    apiMock.mockImplementation((path: string) => {
+      if (path === '/api/projects/p1/activity?limit=50') {
+        return Promise.resolve({
+          items: [
+            activityItem({ id: 10, event_type: 'meeting.notes_ingested', payload: {} }),
+            activityItem({ id: 11, event_type: 'agenda.created', payload: { title: '分布式缓存容灾演练与网关限流压测' } }),
+          ],
+          next_cursor: null,
+        })
+      }
+      if (path === '/api/projects/p1/updates?limit=50&offset=0') return Promise.resolve([])
+      return Promise.resolve({})
+    })
+
+    renderActivity()
+    expect(await screen.findByText(/在会议中完成了 AI 智能提炼/)).toBeInTheDocument()
+    expect(await screen.findByText(/创建了议题「分布式缓存容灾演练与网关限流压测」/)).toBeInTheDocument()
+
+    setLocale('en')
+    try {
+      expect(await screen.findByText(/Ran AI Smart Extract on meeting notes/)).toBeInTheDocument()
+      expect(await screen.findByText(/Created agenda item "Distributed Cache DR Drill & Gateway Rate-Limit Stress Test"/)).toBeInTheDocument()
+    } finally {
+      setLocale('zh')
+    }
+  })
 })
diff --git a/frontend/src/utils/activity.ts b/frontend/src/utils/activity.ts
index 154cb0e..93a6ec3 100644
--- a/frontend/src/utils/activity.ts
+++ b/frontend/src/utils/activity.ts
@@ -1,4 +1,4 @@
-import { locale } from '../i18n'
+import { locale, translateSeededText } from '../i18n'
 
 type ActivityPayload = Record<string, unknown> | null | undefined
 
@@ -24,6 +24,7 @@ const ACTIVITY_TEMPLATES: Record<string, [string, string]> = {
   'meeting.canceled': ['取消了会议「{subject}」', '取消了会议'],
   'meeting.completed': ['结束了会议「{subject}」', '结束了会议'],
   'meeting.reopened': ['重新打开了会议「{subject}」', '重新打开了会议'],
+  'meeting.notes_ingested': ['提炼并同步了会议纪要「{subject}」', '在会议中完成了 AI 智能提炼'],
 
   'agenda.created': ['创建了议题「{subject}」', '创建了议题'],
   'agenda.updated': ['更新了议题「{subject}」', '更新了议题'],
@@ -82,6 +83,7 @@ const EN_ACTIVITY_TEMPLATES: Record<string, [string, string]> = {
   'meeting.canceled': ['Canceled meeting "{subject}"', 'Canceled meeting'],
   'meeting.completed': ['Completed meeting "{subject}"', 'Completed meeting'],
   'meeting.reopened': ['Reopened meeting "{subject}"', 'Reopened meeting'],
+  'meeting.notes_ingested': ['Extracted and synced meeting notes "{subject}"', 'Ran AI Smart Extract on meeting notes'],
 
   'agenda.created': ['Created agenda item "{subject}"', 'Created agenda item'],
   'agenda.updated': ['Updated agenda item "{subject}"', 'Updated agenda item'],
@@ -139,6 +141,7 @@ export function activityLabel(eventType: string, payload?: ActivityPayload): str
   const dict = locale.value === 'en' ? EN_ACTIVITY_TEMPLATES : ACTIVITY_TEMPLATES
   const template = dict[eventType]
   if (!template) return eventType
-  const subject = subjectOf(payload)
+  const rawSubject = subjectOf(payload)
+  const subject = rawSubject ? translateSeededText(rawSubject, locale.value) : null
   return (subject ? template[0] : template[1]).replace('{subject}', subject ?? '')
 }
diff --git a/frontend/src/views/ProjectDetailView.vue b/frontend/src/views/ProjectDetailView.vue
index 819994c..a239c06 100644
--- a/frontend/src/views/ProjectDetailView.vue
+++ b/frontend/src/views/ProjectDetailView.vue
@@ -1,6 +1,6 @@
 <script setup lang="ts">
 import { NButton, NDropdown, NDrawer, NDrawerContent, NForm, NFormItem, NInput, NSelect, NTabPane, NTabs, NTag, useDialog } from 'naive-ui'
-import { computed, h, onMounted, ref, watch } from 'vue'
+import { computed, h, nextTick, onMounted, ref, watch } from 'vue'
 import StatusPill from '../components/StatusPill.vue'
 import { useI18n } from '../i18n'
 import { errorMessage } from '../utils/errors'
@@ -30,10 +30,14 @@ import type {
 
 type Tab = 'overview' | 'meetings' | 'actions' | 'decisions' | 'questions' | 'files' | 'activity'
 
-const { tr, translateSeededText } = useI18n()
+const { locale, tr, translateSeededText } = useI18n()
 const route = useRoute()
 const router = useRouter()
 const dialog = useDialog()
+const tabsInstRef = ref<{ syncBarPosition?: () => void } | null>(null)
+watch(locale, () => {
+  void nextTick(() => tabsInstRef.value?.syncBarPosition?.())
+})
 const project = ref<ProjectDetail | null>(null)
 const attention = ref<AttentionItem[]>([])
 const openActions = ref<ProjectActionSummary[]>([])
@@ -445,7 +449,7 @@ onMounted(load)
 
       <p v-if="error" class="notice notice-error">{{ error }}</p>
       <nav class="project-tabs" :aria-label="tr('项目内容', 'Project tabs')">
-        <NTabs :value="tab" type="line" @update:value="selectTab">
+        <NTabs ref="tabsInstRef" :key="locale" :value="tab" type="line" @update:value="selectTab">
           <NTabPane name="overview" :tab="tr('概览', 'Overview')" :tab-props="tabA11y('overview')">
             <ProjectOverview :project="project" :attention="attention" :open-actions="openActions" :can-contribute="canContribute" @schedule-meeting="openCreate('meeting')" @open-tab="selectTab" />
           </NTabPane>