diff --git a/src/App.vue b/src/App.vue
index 8b8c558d..723ff45f 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -25,10 +25,11 @@ import { applyDocumentThemeChrome, resolveThemeName } from '@/utils/themePalette
 import { getDisplayImageUrl } from '@/utils/imageUtils'
 import { configureApexChartsTheme } from '@/utils/apexCharts'
 import { useGlobalOfflineStatus, type ConnectionFailureReason } from '@/composables/useOfflineStatus'
+import { useAppActivityLifecycle } from '@/composables/useAppActivityLifecycle'
+import { commitPreloadedBackgroundRotation } from '@/utils/backgroundRotation'
 
 const LOGIN_WALLPAPER_ROUTE = '/login'
 const BACKGROUND_CROSSFADE_DURATION_MS = 1500
-const WINDOW_BLUR_RENDER_THROTTLE_DELAY_MS = 60_000
 const MEDIA_DENSE_OPTICAL_DEFER_MS = 1_600
 
 // 生效主题
@@ -73,7 +74,7 @@ const backgroundImages = ref<string[]>([])
 const activeImageIndex = ref(0)
 const previousImageIndex = ref<number | null>(null)
 const isBackgroundCrossfading = ref(false)
-const isRenderThrottled = ref(document.visibilityState === 'hidden')
+const { allowsDecorativeMotion, isSuspended: isRenderThrottled, state: appActivityState } = useAppActivityLifecycle()
 const isTransparentTheme = computed(() => globalTheme.name.value === 'transparent')
 const isGlassTheme = computed(() => globalTheme.name.value === 'glass')
 const effectiveGlassSettings = useEffectiveGlassSettings()
@@ -118,7 +119,7 @@ let backgroundRetryTimer: number | null = null
 let backgroundRequestController: AbortController | null = null
 let backgroundCrossfadeTimer: number | null = null
 let authenticatedStateTimer: number | null = null
-let windowBlurRenderThrottleTimer: number | null = null
+let backgroundRotationVersion = 0
 
 // 读取并同步透明主题背景设置到根组件响应式状态。
 function applyTransparentBackgroundSettings() {
@@ -171,52 +172,6 @@ void router.isReady().then(() => {
   isInitialRouteReady.value = true
 })
 
-function clearWindowBlurRenderThrottleTimer() {
-  if (windowBlurRenderThrottleTimer) {
-    window.clearTimeout(windowBlurRenderThrottleTimer)
-    windowBlurRenderThrottleTimer = null
-  }
-}
-
-function restoreForegroundRendering() {
-  const wasRenderThrottled = isRenderThrottled.value
-
-  clearWindowBlurRenderThrottleTimer()
-  isRenderThrottled.value = false
-
-  if (wasRenderThrottled && backgroundImages.value.length > 1) {
-    startBackgroundRotation()
-    rotateBackgroundImage()
-  }
-}
-
-function throttleBackgroundRendering() {
-  clearWindowBlurRenderThrottleTimer()
-  resetBackgroundCrossfade()
-  isRenderThrottled.value = true
-}
-
-function handleWindowBlurRenderThrottle() {
-  clearWindowBlurRenderThrottleTimer()
-  if (document.visibilityState === 'hidden') {
-    throttleBackgroundRendering()
-    return
-  }
-
-  windowBlurRenderThrottleTimer = window.setTimeout(() => {
-    if (document.visibilityState === 'visible' && !document.hasFocus()) {
-      isRenderThrottled.value = true
-    }
-    windowBlurRenderThrottleTimer = null
-  }, WINDOW_BLUR_RENDER_THROTTLE_DELAY_MS)
-}
-
-function handleWindowFocusRenderThrottle() {
-  if (document.visibilityState === 'visible') {
-    restoreForegroundRendering()
-  }
-}
-
 let heartbeatInterval: number | null = null
 let connectionRetryTimer: number | null = null
 let connectionProbePromise: Promise<boolean> | null = null
@@ -397,18 +352,14 @@ function handleSystemThemeChange() {
 /** 页面重新可见时同步主题，并在连接异常时立即重新探测服务。 */
 function handleVisibilityThemeSync() {
   if (document.visibilityState === 'visible') {
-    restoreForegroundRendering()
     syncThemePreferenceFromStorage()
     if (isLogin.value && !offlineStatus.isOnline.value) offlineStatus.requestConnectionCheck()
-  } else {
-    throttleBackgroundRendering()
   }
 }
 
 /** 页面从缓存或重新聚焦恢复时刷新主题偏好和异常连接状态。 */
 function handlePageShowThemeSync() {
   if (document.visibilityState === 'visible') {
-    restoreForegroundRendering()
     if (isLogin.value && !offlineStatus.isOnline.value) offlineStatus.requestConnectionCheck()
   }
   syncThemePreferenceFromStorage()
@@ -461,27 +412,32 @@ async function fetchBackgroundImages() {
 
 // 背景图片轮换函数
 function rotateBackgroundImage() {
-  if (isRenderThrottled.value) return
+  if (!allowsDecorativeMotion.value) return
 
   if (backgroundImages.value.length > 1) {
     // 计算下一个图片索引
     const nextIndex = (activeImageIndex.value + 1) % backgroundImages.value.length
-    // 预加载下一张图片
-    preloadImage(backgroundImages.value[nextIndex]).then(success => {
-      // 只有图片成功加载才切换
-      if (success) {
-        activateBackgroundImage(nextIndex)
-      }
+    const requestVersion = ++backgroundRotationVersion
+
+    void commitPreloadedBackgroundRotation({
+      canCommit: () => allowsDecorativeMotion.value && requestVersion === backgroundRotationVersion,
+      commit: () => activateBackgroundImage(nextIndex),
+      preload: () => preloadImage(backgroundImages.value[nextIndex]),
     })
   }
 }
 
+// 停止轮询并使已经发起的壁纸预加载失效，避免非活动状态收到迟到提交。
+function stopBackgroundRotation() {
+  backgroundRotationVersion += 1
+  removeBackgroundTimer('background-rotation')
+}
+
 // 开始背景图片轮换
 function startBackgroundRotation() {
-  // 清除现有定时器
-  removeBackgroundTimer('background-rotation')
+  stopBackgroundRotation()
 
-  if (backgroundImages.value.length > 1) {
+  if (allowsDecorativeMotion.value && backgroundImages.value.length > 1) {
     // 使用优化的定时器管理器，后台时自动暂停
     addBackgroundTimer(
       'background-rotation',
@@ -495,6 +451,16 @@ function startBackgroundRotation() {
   }
 }
 
+watch(appActivityState, state => {
+  resetBackgroundCrossfade()
+
+  if (state === 'active') {
+    startBackgroundRotation()
+  } else {
+    stopBackgroundRotation()
+  }
+})
+
 // 停止登录页、透明主题或玻璃主题背景图加载、重试和轮播。
 function stopBackgroundLoading() {
   backgroundRequestController?.abort()
@@ -506,7 +472,7 @@ function stopBackgroundLoading() {
   }
 
   resetBackgroundCrossfade()
-  removeBackgroundTimer('background-rotation')
+  stopBackgroundRotation()
 }
 
 // 初始化登录后的全局设置和用户设置状态。
@@ -647,8 +613,6 @@ onMounted(async () => {
   document.addEventListener('visibilitychange', handleVisibilityThemeSync)
   window.addEventListener('pageshow', handlePageShowThemeSync)
   window.addEventListener('focus', handlePageShowThemeSync)
-  window.addEventListener('focus', handleWindowFocusRenderThrottle)
-  window.addEventListener('blur', handleWindowBlurRenderThrottle)
   window.addEventListener(TRANSPARENCY_SETTINGS_CHANGED_EVENT, handleTransparencySettingsChanged)
 
   // 登录页壁纸仅在未登录登录页需要，避免其他首屏额外发起图片列表请求。
@@ -698,7 +662,6 @@ onUnmounted(() => {
     window.clearTimeout(authenticatedStateTimer)
     authenticatedStateTimer = null
   }
-  clearWindowBlurRenderThrottleTimer()
   // 停止心跳
   stopHeartbeat()
   prefersColorSchemeMediaQuery?.removeEventListener('change', handleSystemThemeChange)
@@ -706,8 +669,6 @@ onUnmounted(() => {
   document.removeEventListener('visibilitychange', handleVisibilityThemeSync)
   window.removeEventListener('pageshow', handlePageShowThemeSync)
   window.removeEventListener('focus', handlePageShowThemeSync)
-  window.removeEventListener('focus', handleWindowFocusRenderThrottle)
-  window.removeEventListener('blur', handleWindowBlurRenderThrottle)
   window.removeEventListener(TRANSPARENCY_SETTINGS_CHANGED_EVENT, handleTransparencySettingsChanged)
 })
 </script>
@@ -717,8 +678,10 @@ onUnmounted(() => {
     class="app-wrapper"
     :class="{
       'app-wrapper--background-transition': isBackgroundCrossfading,
+      'app-wrapper--decorative-motion-paused': !allowsDecorativeMotion,
       'app-wrapper--render-throttled': isRenderThrottled,
     }"
+    :data-app-activity-state="appActivityState"
     :style="appWrapperStyle"
   >
     <!-- 登录页、透明主题和玻璃主题共用动态壁纸场景。 -->
@@ -889,14 +852,15 @@ html[data-glass-appearance='frosted'] .background-container.is-glass-theme .back
   .global-blur-layer {
     backdrop-filter: none;
   }
+}
 
+.app-wrapper--decorative-motion-paused {
   .login-bg-decor *,
   .login-logo,
   .login-logo-wrapper,
   .login-logo-wrapper::before,
   .login-title,
-  .login-subtitle,
-  .agent-assistant-fab * {
+  .login-subtitle {
     animation-play-state: paused !important;
   }
 }
diff --git a/src/components/agent/AgentAssistantEntry.vue b/src/components/agent/AgentAssistantEntry.vue
index 60b462dc..825432f6 100644
--- a/src/components/agent/AgentAssistantEntry.vue
+++ b/src/components/agent/AgentAssistantEntry.vue
@@ -35,10 +35,13 @@ interface AgentAssistantEntryBubbleInput {
 const props = withDefaults(
   defineProps<{
     active?: boolean
+    /** 是否允许入口的随机动作、指针跟随和自动贴边，不影响 thinking 等业务状态。 */
+    motionActive?: boolean
     thinking?: boolean
   }>(),
   {
     active: true,
+    motionActive: true,
     thinking: false,
   },
 )
@@ -214,7 +217,7 @@ const {
   playAction: playAgentPetAction,
   scheduleRandomAction: scheduleFabRandomAction,
 } = useAgentPetMachine({
-  active: () => props.active,
+  active: () => props.active && props.motionActive,
   docked: fabDocked,
   dragging: fabDragging,
   pressed: fabPressed,
@@ -237,8 +240,7 @@ function getViewportSize() {
 
   // 取布局视口和可见视口的较小值，避免两者短暂不同步时把入口计算到屏幕外。
   return {
-    height:
-      visualHeight > 0 && layoutHeight > 0 ? Math.min(visualHeight, layoutHeight) : visualHeight || layoutHeight,
+    height: visualHeight > 0 && layoutHeight > 0 ? Math.min(visualHeight, layoutHeight) : visualHeight || layoutHeight,
     width: visualWidth > 0 && layoutWidth > 0 ? Math.min(visualWidth, layoutWidth) : visualWidth || layoutWidth,
   }
 }
@@ -826,17 +828,18 @@ function updateFabPointerFromPoint(point: FabPointerPoint) {
 
 // 使用 requestAnimationFrame 合并高频指针事件，降低全局跟随的渲染开销。
 function queueFabPointerUpdate(clientX: number, clientY: number) {
-  if (!props.active) return
+  if (!props.active || !props.motionActive) return
 
   fabPendingPointerPoint = { clientX, clientY }
   if (fabPointerFrame) return
 
   fabPointerFrame = window.requestAnimationFrame(() => {
     fabPointerFrame = 0
-    if (!fabPendingPointerPoint) return
-
-    updateFabPointerFromPoint(fabPendingPointerPoint)
+    const point = fabPendingPointerPoint
     fabPendingPointerPoint = null
+    if (!point || !props.active || !props.motionActive) return
+
+    updateFabPointerFromPoint(point)
   })
 }
 
@@ -850,22 +853,6 @@ function updateFabPointer(event: PointerEvent) {
   queueFabPointerUpdate(event.clientX, event.clientY)
 }
 
-// 重置机器人按压状态和眼神跟随位移。
-function resetFabPointer() {
-  fabPressed.value = false
-  fabPointerStyle.value = {
-    '--agent-assistant-body-x': '0px',
-    '--agent-assistant-body-y': '0px',
-    '--agent-assistant-eye-x': '0px',
-    '--agent-assistant-eye-y': '0px',
-    '--agent-assistant-head-x': '0px',
-    '--agent-assistant-head-y': '0px',
-    '--agent-assistant-pointer-x': '0px',
-    '--agent-assistant-pointer-y': '0px',
-    '--agent-assistant-robot-tilt': '0deg',
-  }
-}
-
 // 清理入口自动贴边计时器。
 function clearFabIdleTimer() {
   if (fabIdleTimer === null) return
@@ -895,11 +882,20 @@ function suppressNextFabClick() {
 // 在入口靠近右侧边缘且空闲时安排自动贴边收起。
 function scheduleFabAutoDock() {
   clearFabIdleTimer()
-  if (fabDocked.value || hasKeepOpenFabBubbles.value || fabRandomAction.value || !shouldFabAutoDock()) return
+  if (
+    !props.active ||
+    !props.motionActive ||
+    fabDocked.value ||
+    hasKeepOpenFabBubbles.value ||
+    fabRandomAction.value ||
+    !shouldFabAutoDock()
+  )
+    return
 
   fabIdleTimer = window.setTimeout(() => {
     fabIdleTimer = null
-    if (fabDocked.value || hasKeepOpenFabBubbles.value || !shouldFabAutoDock()) return
+    if (!props.active || !props.motionActive || fabDocked.value || hasKeepOpenFabBubbles.value || !shouldFabAutoDock())
+      return
 
     if (fabRandomAction.value) {
       scheduleFabAutoDock()
@@ -915,14 +911,36 @@ function pauseFabAutoDock() {
   clearFabIdleTimer()
 }
 
-// 取消挂起的全局指针帧并移除监听器。
-function teardownFabPointerTracking() {
+// 取消挂起的全局指针帧，避免状态切换后迟到回调重新写入位移。
+function cancelFabPointerUpdate() {
   if (fabPointerFrame) {
     window.cancelAnimationFrame(fabPointerFrame)
     fabPointerFrame = 0
   }
 
   fabPendingPointerPoint = null
+}
+
+// 重置机器人按压状态和眼神跟随位移。
+function resetFabPointer() {
+  cancelFabPointerUpdate()
+  fabPressed.value = false
+  fabPointerStyle.value = {
+    '--agent-assistant-body-x': '0px',
+    '--agent-assistant-body-y': '0px',
+    '--agent-assistant-eye-x': '0px',
+    '--agent-assistant-eye-y': '0px',
+    '--agent-assistant-head-x': '0px',
+    '--agent-assistant-head-y': '0px',
+    '--agent-assistant-pointer-x': '0px',
+    '--agent-assistant-pointer-y': '0px',
+    '--agent-assistant-robot-tilt': '0deg',
+  }
+}
+
+// 取消挂起的全局指针帧并移除监听器。
+function teardownFabPointerTracking() {
+  cancelFabPointerUpdate()
   window.removeEventListener('pointermove', handleGlobalFabPointer)
   window.removeEventListener('pointerdown', handleGlobalFabPointer)
 }
@@ -1432,6 +1450,19 @@ watch(
   },
 )
 
+watch(
+  () => props.motionActive,
+  motionActive => {
+    if (motionActive) {
+      if (props.active && shouldFabAutoDock()) scheduleFabAutoDock()
+      return
+    }
+
+    clearFabIdleTimer()
+    resetFabPointer()
+  },
+)
+
 onScopeDispose(clearFabIdleTimer)
 onScopeDispose(clearFabSuppressNextClickTimer)
 onScopeDispose(resetFabBubbles)
@@ -1752,12 +1783,8 @@ defineExpose({
 
 .agent-assistant-fab__bubbles--arrow-notification::before {
   --agent-assistant-bubble-arrow-border: rgba(var(--v-theme-primary), 0.22);
-  --agent-assistant-bubble-arrow-bg: linear-gradient(
-      135deg,
-      rgba(var(--v-theme-primary), 0.1),
-      transparent 48%
-    ),
-    rgba(var(--v-theme-surface), 0.94);
+  --agent-assistant-bubble-arrow-bg:
+    linear-gradient(135deg, rgba(var(--v-theme-primary), 0.1), transparent 48%), rgba(var(--v-theme-surface), 0.94);
 }
 
 .agent-assistant-fab__bubbles--arrow-success::before {
@@ -1778,11 +1805,8 @@ defineExpose({
 
 .agent-assistant-fab__bubbles--arrow-toast::before {
   --agent-assistant-bubble-arrow-border: rgba(var(--agent-assistant-bubble-arrow-accent-rgb), 0.3);
-  --agent-assistant-bubble-arrow-bg: linear-gradient(
-      135deg,
-      rgba(var(--agent-assistant-bubble-arrow-accent-rgb), 0.12),
-      transparent 54%
-    ),
+  --agent-assistant-bubble-arrow-bg:
+    linear-gradient(135deg, rgba(var(--agent-assistant-bubble-arrow-accent-rgb), 0.12), transparent 54%),
     rgba(var(--v-theme-surface), 0.95);
 }
 
diff --git a/src/components/agent/AgentAssistantPanel.vue b/src/components/agent/AgentAssistantPanel.vue
index a8fc47df..b1a5b6ae 100644
--- a/src/components/agent/AgentAssistantPanel.vue
+++ b/src/components/agent/AgentAssistantPanel.vue
@@ -158,9 +158,12 @@ const userStore = useUserStore()
 const props = withDefaults(
   defineProps<{
     modelValue?: boolean
+    /** 是否允许面板的装饰性动效，不影响消息流、thinking 或输入反馈。 */
+    motionActive?: boolean
   }>(),
   {
     modelValue: false,
+    motionActive: true,
   },
 )
 
@@ -211,13 +214,11 @@ let pendingMessageScrollToBottom = false
 let streamPersistTimer: number | null = null
 let userAbortRequested = false
 let streamRecoveryTimer: number | null = null
-let pendingStreamRecovery:
-  | {
-      sessionId: string
-      startedAt: number
-      attempts: number
-    }
-  | null = null
+let pendingStreamRecovery: {
+  sessionId: string
+  startedAt: number
+  attempts: number
+} | null = null
 
 const md = new MarkdownIt({
   html: true,
@@ -250,12 +251,11 @@ const filteredSlashCommands = computed(() => {
   const query = slashCommandQuery.value
   if (!query) return slashCommands.value
 
-  return slashCommands.value
-    .filter(command => {
-      const haystack = `${command.command} ${command.description} ${command.category || ''}`.toLowerCase()
+  return slashCommands.value.filter(command => {
+    const haystack = `${command.command} ${command.description} ${command.category || ''}`.toLowerCase()
 
-      return haystack.includes(query)
-    })
+    return haystack.includes(query)
+  })
 })
 // 判断是否展示命令建议浮层。
 const showSlashCommandMenu = computed(
@@ -1956,6 +1956,7 @@ onScopeDispose(() => {
   <aside
     v-show="isOpen"
     class="agent-assistant-panel"
+    :class="{ 'is-motion-paused': !props.motionActive, 'is-open': isOpen }"
     :style="drawerStyle"
     role="dialog"
     :aria-label="t('agentAssistant.title')"
@@ -2515,13 +2516,16 @@ onScopeDispose(() => {
   position: absolute;
   display: block;
   border-radius: 0 0 999px 999px;
-  animation: agent-fab-blink 4.8s ease-in-out infinite;
   block-size: 0.24rem;
   border-block-end: 0.1rem solid var(--agent-assistant-mini-robot-eye);
   inline-size: 0.22rem;
   inset-block-start: 0.16rem;
 }
 
+.agent-assistant-panel.is-open:not(.is-motion-paused) .agent-assistant-mini-bot__eye {
+  animation: agent-fab-blink 4.8s ease-in-out 1;
+}
+
 .agent-assistant-mini-bot__eye--left {
   inset-inline-start: 0.22rem;
 }
diff --git a/src/components/agent/AgentAssistantWidget.vue b/src/components/agent/AgentAssistantWidget.vue
index 5eeb46db..ad70032c 100644
--- a/src/components/agent/AgentAssistantWidget.vue
+++ b/src/components/agent/AgentAssistantWidget.vue
@@ -1,12 +1,14 @@
 <script setup lang="ts">
 import AgentAssistantEntry from './AgentAssistantEntry.vue'
 import AgentAssistantPanel from './AgentAssistantPanel.vue'
+import { useAppActivityLifecycle } from '@/composables/useAppActivityLifecycle'
 
 type AgentAssistantEntryRef = InstanceType<typeof AgentAssistantEntry>
 
 const panelOpen = ref(false)
 const thinking = ref(false)
 const entryRef = ref<AgentAssistantEntryRef | null>(null)
+const { allowsDecorativeMotion } = useAppActivityLifecycle()
 
 // 打开 Agent 面板并清空入口预览气泡。
 function openPanel() {
@@ -23,6 +25,17 @@ function handleAssistantPreview(value: string) {
 </script>
 
 <template>
-  <AgentAssistantEntry ref="entryRef" :active="!panelOpen" :thinking="thinking" @open="openPanel" />
-  <AgentAssistantPanel v-model="panelOpen" @assistant-preview="handleAssistantPreview" @thinking-change="thinking = $event" />
+  <AgentAssistantEntry
+    ref="entryRef"
+    :active="!panelOpen"
+    :motion-active="allowsDecorativeMotion"
+    :thinking="thinking"
+    @open="openPanel"
+  />
+  <AgentAssistantPanel
+    v-model="panelOpen"
+    :motion-active="allowsDecorativeMotion"
+    @assistant-preview="handleAssistantPreview"
+    @thinking-change="thinking = $event"
+  />
 </template>
diff --git a/src/components/agent/__tests__/AgentAssistantEntry.spec.ts b/src/components/agent/__tests__/AgentAssistantEntry.spec.ts
new file mode 100644
index 00000000..db06680d
--- /dev/null
+++ b/src/components/agent/__tests__/AgentAssistantEntry.spec.ts
@@ -0,0 +1,71 @@
+import { shallowMount } from '@vue/test-utils'
+import { nextTick } from 'vue'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import AgentAssistantEntry from '@/components/agent/AgentAssistantEntry.vue'
+
+vi.mock('vue-i18n', () => ({
+  useI18n: () => ({ t: (key: string) => key }),
+}))
+
+describe('AgentAssistantEntry lifecycle motion', () => {
+  let animationFrameCallbacks: Map<number, FrameRequestCallback>
+  let nextAnimationFrameId: number
+
+  beforeEach(() => {
+    vi.useFakeTimers()
+    animationFrameCallbacks = new Map()
+    nextAnimationFrameId = 1
+    vi.stubGlobal(
+      'requestAnimationFrame',
+      vi.fn((callback: FrameRequestCallback) => {
+        const id = nextAnimationFrameId++
+        animationFrameCallbacks.set(id, callback)
+        return id
+      }),
+    )
+    vi.stubGlobal(
+      'cancelAnimationFrame',
+      vi.fn((id: number) => {
+        animationFrameCallbacks.delete(id)
+      }),
+    )
+  })
+
+  afterEach(() => {
+    vi.useRealTimers()
+  })
+
+  it('cancels pointer frames and auto-dock timers when decorative motion stops', async () => {
+    const wrapper = shallowMount(AgentAssistantEntry, {
+      global: {
+        stubs: {
+          AgentPetStage: true,
+          VIcon: true,
+        },
+      },
+      props: {
+        active: true,
+        motionActive: true,
+      },
+    })
+    await nextTick()
+
+    const pointerEvent = new Event('pointermove')
+    Object.assign(pointerEvent, { clientX: 480, clientY: 320 })
+    const frameCountBeforePointer = animationFrameCallbacks.size
+    window.dispatchEvent(pointerEvent)
+    const pointerFrameId = nextAnimationFrameId - 1
+
+    expect(animationFrameCallbacks.size).toBe(frameCountBeforePointer + 1)
+    expect(vi.getTimerCount()).toBeGreaterThanOrEqual(2)
+
+    await wrapper.setProps({ motionActive: false })
+    await nextTick()
+
+    expect(cancelAnimationFrame).toHaveBeenCalledWith(pointerFrameId)
+    expect(animationFrameCallbacks.has(pointerFrameId)).toBe(false)
+    expect(vi.getTimerCount()).toBe(0)
+
+    wrapper.unmount()
+  })
+})
diff --git a/src/components/agent/pet/__tests__/useAgentPetMachine.spec.ts b/src/components/agent/pet/__tests__/useAgentPetMachine.spec.ts
new file mode 100644
index 00000000..92c7ddc4
--- /dev/null
+++ b/src/components/agent/pet/__tests__/useAgentPetMachine.spec.ts
@@ -0,0 +1,58 @@
+import { effectScope, nextTick, ref } from 'vue'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { AGENT_PET_RANDOM_ACTION_MIN_DELAY } from '../agentPetActions'
+import { useAgentPetMachine } from '../useAgentPetMachine'
+
+describe('useAgentPetMachine', () => {
+  beforeEach(() => {
+    vi.useFakeTimers()
+    vi.spyOn(Math, 'random').mockReturnValue(0)
+  })
+
+  afterEach(() => {
+    vi.useRealTimers()
+    vi.restoreAllMocks()
+  })
+
+  it('runs finite random actions and clears the queue when decorative motion stops', async () => {
+    const active = ref(true)
+    const docked = ref(false)
+    const dragging = ref(false)
+    const pressed = ref(false)
+    const thinking = ref(false)
+    const scope = effectScope()
+    const machine = scope.run(() =>
+      useAgentPetMachine({
+        active,
+        docked,
+        dragging,
+        pressed,
+        scheduleAutoDock: vi.fn(),
+        shouldAutoDock: () => false,
+        thinking,
+      }),
+    )
+
+    expect(machine).toBeDefined()
+
+    machine?.scheduleRandomAction()
+    vi.advanceTimersByTime(AGENT_PET_RANDOM_ACTION_MIN_DELAY)
+
+    expect(machine?.currentAction.value).toBe('wave')
+
+    active.value = false
+    await nextTick()
+
+    expect(machine?.currentAction.value).toBeNull()
+    expect(vi.getTimerCount()).toBe(0)
+
+    active.value = true
+    await nextTick()
+    vi.advanceTimersByTime(AGENT_PET_RANDOM_ACTION_MIN_DELAY)
+
+    expect(machine?.currentAction.value).not.toBeNull()
+
+    scope.stop()
+    expect(vi.getTimerCount()).toBe(0)
+  })
+})
diff --git a/src/components/agent/pet/renderers/cssRobotBase.scss b/src/components/agent/pet/renderers/cssRobotBase.scss
index c1438af7..9eb50423 100644
--- a/src/components/agent/pet/renderers/cssRobotBase.scss
+++ b/src/components/agent/pet/renderers/cssRobotBase.scss
@@ -27,7 +27,6 @@
   z-index: 3;
   display: block;
   border-radius: 999px;
-  animation: agent-fab-antenna-idle 3.9s ease-in-out infinite;
   background: var(--agent-assistant-robot-outline);
   block-size: 0.66rem;
   inline-size: 0.18rem;
@@ -58,7 +57,6 @@
   display: block;
   border: 2px solid var(--agent-assistant-robot-outline);
   border-radius: 11px;
-  animation: agent-fab-head-idle 4.6s ease-in-out infinite;
   background: linear-gradient(
     145deg,
     var(--agent-assistant-robot-shell-start) 0%,
@@ -97,7 +95,6 @@
   position: absolute;
   display: block;
   border-radius: 0 0 999px 999px;
-  animation: agent-fab-blink 4.8s ease-in-out infinite;
   block-size: 0.42rem;
   border-block-end: 0.15rem solid var(--agent-assistant-robot-eye);
   inline-size: 0.42rem;
@@ -136,7 +133,6 @@
   display: block;
   border: 2px solid var(--agent-assistant-robot-outline);
   border-radius: 0.65rem 0.65rem 0.55rem 0.55rem;
-  animation: agent-fab-body-idle 4.2s ease-in-out infinite;
   background: linear-gradient(
     145deg,
     var(--agent-assistant-robot-shell-mid) 0%,
@@ -204,14 +200,12 @@
 }
 
 .agent-assistant-fab__arm--left {
-  animation: agent-fab-arm-left-idle 3.8s ease-in-out infinite;
   inset-inline-start: 0.9rem;
   transform: rotate(17deg);
   transform-origin: top center;
 }
 
 .agent-assistant-fab__arm--right {
-  animation: agent-fab-arm-right-idle 4.1s ease-in-out infinite;
   inset-inline-start: 3.08rem;
   transform: rotate(-17deg);
   transform-origin: top center;
@@ -225,13 +219,11 @@
 }
 
 .agent-assistant-fab__leg--left {
-  animation: agent-fab-leg-left-idle 4.8s ease-in-out infinite;
   inset-inline-start: 1.48rem;
   transform-origin: top center;
 }
 
 .agent-assistant-fab__leg--right {
-  animation: agent-fab-leg-right-idle 4.8s ease-in-out 0.35s infinite;
   inset-inline-start: 2.46rem;
   transform-origin: top center;
 }
@@ -257,8 +249,7 @@
 }
 
 .agent-assistant-fab__trigger:focus-visible .agent-assistant-fab__bot {
-  filter:
-    drop-shadow(0 0.55rem 0.55rem var(--agent-assistant-robot-shadow))
+  filter: drop-shadow(0 0.55rem 0.55rem var(--agent-assistant-robot-shadow))
     drop-shadow(0 0 0.34rem rgba(var(--v-theme-primary), 0.55));
 }
 
@@ -315,83 +306,6 @@
   transform: translate(0.34rem, 0.02rem) rotate(2deg) scale(0.82);
 }
 
-@keyframes agent-fab-head-idle {
-  0%,
-  100% {
-    transform: translate(var(--agent-assistant-head-x), var(--agent-assistant-head-y)) rotate(0deg);
-  }
-
-  50% {
-    transform: translate(var(--agent-assistant-head-x), calc(var(--agent-assistant-head-y) - 0.06rem)) rotate(-1.8deg);
-  }
-}
-
-@keyframes agent-fab-body-idle {
-  0%,
-  100% {
-    transform: translate(var(--agent-assistant-body-x), var(--agent-assistant-body-y)) scaleY(1);
-  }
-
-  50% {
-    transform: translate(var(--agent-assistant-body-x), calc(var(--agent-assistant-body-y) + 0.04rem)) scaleY(0.97);
-  }
-}
-
-@keyframes agent-fab-antenna-idle {
-  0%,
-  100% {
-    transform: translate(var(--agent-assistant-head-x), var(--agent-assistant-head-y)) rotate(22deg);
-  }
-
-  50% {
-    transform: translate(var(--agent-assistant-head-x), var(--agent-assistant-head-y)) rotate(15deg);
-  }
-}
-
-@keyframes agent-fab-arm-left-idle {
-  0%,
-  100% {
-    transform: rotate(17deg);
-  }
-
-  50% {
-    transform: rotate(12deg) translateY(0.05rem);
-  }
-}
-
-@keyframes agent-fab-arm-right-idle {
-  0%,
-  100% {
-    transform: rotate(-17deg);
-  }
-
-  50% {
-    transform: rotate(-11deg) translateY(0.05rem);
-  }
-}
-
-@keyframes agent-fab-leg-left-idle {
-  0%,
-  100% {
-    transform: rotate(0deg);
-  }
-
-  50% {
-    transform: rotate(4deg) translateY(0.03rem);
-  }
-}
-
-@keyframes agent-fab-leg-right-idle {
-  0%,
-  100% {
-    transform: rotate(0deg);
-  }
-
-  50% {
-    transform: rotate(-4deg) translateY(0.03rem);
-  }
-}
-
 @keyframes agent-fab-core-pulse {
   0%,
   100% {
diff --git a/src/composables/useAppActivityLifecycle.ts b/src/composables/useAppActivityLifecycle.ts
new file mode 100644
index 00000000..33bbecd4
--- /dev/null
+++ b/src/composables/useAppActivityLifecycle.ts
@@ -0,0 +1,24 @@
+import { appActivityLifecycle, type AppActivityState } from '@/utils/appActivityLifecycle'
+
+const appActivityState = ref<AppActivityState>(appActivityLifecycle.getState())
+
+/**
+ * 提供应用级活动状态；所有消费者共享同一套全局事件监听和生命周期时钟。
+ */
+export function useAppActivityLifecycle() {
+  const release = appActivityLifecycle.acquire()
+  const unsubscribe = appActivityLifecycle.subscribe(state => {
+    appActivityState.value = state
+  })
+
+  onScopeDispose(() => {
+    unsubscribe()
+    release()
+  })
+
+  return {
+    allowsDecorativeMotion: computed(() => appActivityState.value === 'active'),
+    isSuspended: computed(() => appActivityState.value === 'suspended'),
+    state: readonly(appActivityState),
+  }
+}
diff --git a/src/utils/__tests__/appActivityLifecycle.spec.ts b/src/utils/__tests__/appActivityLifecycle.spec.ts
new file mode 100644
index 00000000..d337f422
--- /dev/null
+++ b/src/utils/__tests__/appActivityLifecycle.spec.ts
@@ -0,0 +1,98 @@
+import {
+  APP_ACTIVITY_IDLE_DELAY_MS,
+  APP_ACTIVITY_SUSPEND_DELAY_MS,
+  AppActivityLifecycle,
+  type AppActivityState,
+} from '@/utils/appActivityLifecycle'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+
+describe('AppActivityLifecycle', () => {
+  let lifecycle: AppActivityLifecycle
+  let release: (() => void) | null
+  let states: AppActivityState[]
+  let focused: boolean
+  let visibility: DocumentVisibilityState
+
+  beforeEach(() => {
+    vi.useFakeTimers()
+    focused = true
+    visibility = 'visible'
+    vi.spyOn(document, 'hasFocus').mockImplementation(() => focused)
+    vi.spyOn(document, 'visibilityState', 'get').mockImplementation(() => visibility)
+    lifecycle = new AppActivityLifecycle()
+    states = []
+    lifecycle.subscribe(state => states.push(state))
+    release = lifecycle.acquire()
+  })
+
+  afterEach(() => {
+    release?.()
+    release = null
+    vi.useRealTimers()
+    vi.restoreAllMocks()
+  })
+
+  it('enters idle after focused inactivity and wakes on interaction', () => {
+    vi.advanceTimersByTime(APP_ACTIVITY_IDLE_DELAY_MS)
+
+    expect(lifecycle.getState()).toBe('idle')
+
+    document.dispatchEvent(new Event('pointerdown'))
+
+    expect(lifecycle.getState()).toBe('active')
+    expect(states).toContain('idle')
+  })
+
+  it('keeps the idle deadline relative to the latest high-frequency activity', () => {
+    vi.advanceTimersByTime(APP_ACTIVITY_IDLE_DELAY_MS - 1_000)
+    document.dispatchEvent(new Event('pointermove'))
+    vi.advanceTimersByTime(1_000)
+
+    expect(lifecycle.getState()).toBe('active')
+
+    vi.advanceTimersByTime(APP_ACTIVITY_IDLE_DELAY_MS - 1_000)
+
+    expect(lifecycle.getState()).toBe('idle')
+  })
+
+  it('moves through passive and suspended while the visible window is unfocused', () => {
+    focused = false
+    window.dispatchEvent(new Event('blur'))
+
+    expect(lifecycle.getState()).toBe('passive')
+
+    vi.advanceTimersByTime(APP_ACTIVITY_SUSPEND_DELAY_MS)
+
+    expect(lifecycle.getState()).toBe('suspended')
+
+    focused = true
+    window.dispatchEvent(new Event('focus'))
+
+    expect(lifecycle.getState()).toBe('active')
+  })
+
+  it('suspends immediately while hidden and restores according to focus', () => {
+    visibility = 'hidden'
+    document.dispatchEvent(new Event('visibilitychange'))
+
+    expect(lifecycle.getState()).toBe('suspended')
+
+    visibility = 'visible'
+    focused = false
+    document.dispatchEvent(new Event('visibilitychange'))
+
+    expect(lifecycle.getState()).toBe('passive')
+  })
+
+  it('removes global listeners after the final consumer releases', () => {
+    const removeDocumentListener = vi.spyOn(document, 'removeEventListener')
+    const removeWindowListener = vi.spyOn(window, 'removeEventListener')
+
+    release?.()
+    release = null
+
+    expect(removeDocumentListener).toHaveBeenCalledWith('visibilitychange', expect.any(Function))
+    expect(removeWindowListener).toHaveBeenCalledWith('blur', expect.any(Function))
+    expect(removeWindowListener).toHaveBeenCalledWith('focus', expect.any(Function))
+  })
+})
diff --git a/src/utils/__tests__/backgroundRotation.spec.ts b/src/utils/__tests__/backgroundRotation.spec.ts
new file mode 100644
index 00000000..afc61b3b
--- /dev/null
+++ b/src/utils/__tests__/backgroundRotation.spec.ts
@@ -0,0 +1,61 @@
+import { commitPreloadedBackgroundRotation } from '@/utils/backgroundRotation'
+import { describe, expect, it, vi } from 'vitest'
+
+function deferred<T>() {
+  let resolve!: (value: T) => void
+  const promise = new Promise<T>(promiseResolve => {
+    resolve = promiseResolve
+  })
+
+  return { promise, resolve }
+}
+
+describe('commitPreloadedBackgroundRotation', () => {
+  it('drops a successful preload when the rotation becomes inactive before completion', async () => {
+    const preload = deferred<boolean>()
+    const commit = vi.fn()
+    let active = true
+    const result = commitPreloadedBackgroundRotation({
+      canCommit: () => active,
+      commit,
+      preload: () => preload.promise,
+    })
+
+    active = false
+    preload.resolve(true)
+
+    await expect(result).resolves.toBe(false)
+    expect(commit).not.toHaveBeenCalled()
+  })
+
+  it('commits a successful preload while the request remains current', async () => {
+    const commit = vi.fn()
+
+    await expect(
+      commitPreloadedBackgroundRotation({
+        canCommit: () => true,
+        commit,
+        preload: async () => true,
+      }),
+    ).resolves.toBe(true)
+    expect(commit).toHaveBeenCalledOnce()
+  })
+
+  it('drops an obsolete preload even when decorative motion becomes active again', async () => {
+    const preload = deferred<boolean>()
+    const commit = vi.fn()
+    const requestVersion = 1
+    let currentVersion = requestVersion
+    const result = commitPreloadedBackgroundRotation({
+      canCommit: () => requestVersion === currentVersion,
+      commit,
+      preload: () => preload.promise,
+    })
+
+    currentVersion += 1
+    preload.resolve(true)
+
+    await expect(result).resolves.toBe(false)
+    expect(commit).not.toHaveBeenCalled()
+  })
+})
diff --git a/src/utils/appActivityLifecycle.ts b/src/utils/appActivityLifecycle.ts
new file mode 100644
index 00000000..a20aa53c
--- /dev/null
+++ b/src/utils/appActivityLifecycle.ts
@@ -0,0 +1,186 @@
+/**
+ * 应用活动状态：active 允许交互与装饰动效；idle 表示前台静置；passive 表示短时失焦；
+ * suspended 表示隐藏或持续失焦，需要释放高成本渲染资源。
+ */
+export type AppActivityState = 'active' | 'idle' | 'passive' | 'suspended'
+
+export const APP_ACTIVITY_IDLE_DELAY_MS = 3 * 60_000
+export const APP_ACTIVITY_SUSPEND_DELAY_MS = 60_000
+
+type AppActivityStateListener = (state: AppActivityState) => void
+
+const activityEvents = ['keydown', 'pointerdown', 'pointermove', 'scroll', 'touchstart', 'wheel'] as const
+
+/**
+ * 统一管理页面活动状态，确保装饰动效、定时器和高成本渲染共享相同的前后台语义。
+ */
+export class AppActivityLifecycle {
+  private state: AppActivityState = 'active'
+  private listeners = new Set<AppActivityStateListener>()
+  private idleTimer: number | null = null
+  private suspendTimer: number | null = null
+  private lastActivityAt = Date.now()
+  private acquireCount = 0
+  private started = false
+
+  private readonly handleActivity = () => {
+    if (document.visibilityState !== 'visible' || !document.hasFocus()) return
+
+    this.lastActivityAt = Date.now()
+    this.setState('active')
+    this.scheduleIdle()
+  }
+
+  private readonly handleBlur = () => {
+    if (document.visibilityState === 'hidden') return
+
+    this.clearIdleTimer()
+    this.setState('passive')
+    this.scheduleSuspend()
+  }
+
+  private readonly handleFocus = () => {
+    if (document.visibilityState !== 'visible') return
+
+    this.clearSuspendTimer()
+    this.lastActivityAt = Date.now()
+    this.setState('active')
+    this.scheduleIdle()
+  }
+
+  private readonly handleVisibilityChange = () => {
+    if (document.visibilityState === 'hidden') {
+      this.clearTimers()
+      this.setState('suspended')
+      return
+    }
+
+    if (document.hasFocus()) {
+      this.handleFocus()
+    } else {
+      this.handleBlur()
+    }
+  }
+
+  /** 获取当前生命周期状态。 */
+  getState() {
+    return this.state
+  }
+
+  /** 获取最近一次有效前台交互时间。 */
+  getLastActivityAt() {
+    return this.lastActivityAt
+  }
+
+  /** 订阅状态变化；订阅时立即回放当前状态。 */
+  subscribe(listener: AppActivityStateListener) {
+    this.listeners.add(listener)
+    listener(this.state)
+
+    return () => {
+      this.listeners.delete(listener)
+    }
+  }
+
+  /**
+   * 获取生命周期使用权；首个消费者注册全局监听，最后一个消费者释放全部资源。
+   */
+  acquire() {
+    this.acquireCount += 1
+    if (!this.started) this.start()
+
+    let released = false
+
+    return () => {
+      if (released) return
+
+      released = true
+      this.acquireCount = Math.max(0, this.acquireCount - 1)
+      if (this.acquireCount === 0) this.stop()
+    }
+  }
+
+  /** 供路由或测试路径显式登记一次有效前台活动。 */
+  markActivity() {
+    this.handleActivity()
+  }
+
+  private start() {
+    if (this.started) return
+
+    this.started = true
+    activityEvents.forEach(event => document.addEventListener(event, this.handleActivity, { passive: true }))
+    document.addEventListener('visibilitychange', this.handleVisibilityChange)
+    window.addEventListener('blur', this.handleBlur)
+    window.addEventListener('focus', this.handleFocus)
+
+    this.handleVisibilityChange()
+  }
+
+  private stop() {
+    if (!this.started) return
+
+    this.clearTimers()
+    activityEvents.forEach(event => document.removeEventListener(event, this.handleActivity))
+    document.removeEventListener('visibilitychange', this.handleVisibilityChange)
+    window.removeEventListener('blur', this.handleBlur)
+    window.removeEventListener('focus', this.handleFocus)
+    this.started = false
+  }
+
+  private setState(state: AppActivityState) {
+    if (this.state === state) return
+
+    this.state = state
+    this.listeners.forEach(listener => listener(state))
+  }
+
+  private scheduleIdle() {
+    if (this.idleTimer !== null) return
+
+    const elapsed = Date.now() - this.lastActivityAt
+    const delay = Math.max(0, APP_ACTIVITY_IDLE_DELAY_MS - elapsed)
+
+    this.idleTimer = window.setTimeout(() => {
+      this.idleTimer = null
+      if (document.visibilityState !== 'visible' || !document.hasFocus()) return
+
+      const remaining = APP_ACTIVITY_IDLE_DELAY_MS - (Date.now() - this.lastActivityAt)
+      if (remaining > 0) {
+        this.scheduleIdle()
+        return
+      }
+
+      this.setState('idle')
+    }, delay)
+  }
+
+  private scheduleSuspend() {
+    this.clearSuspendTimer()
+    this.suspendTimer = window.setTimeout(() => {
+      this.suspendTimer = null
+      if (document.visibilityState === 'visible' && !document.hasFocus()) this.setState('suspended')
+    }, APP_ACTIVITY_SUSPEND_DELAY_MS)
+  }
+
+  private clearIdleTimer() {
+    if (this.idleTimer === null) return
+
+    window.clearTimeout(this.idleTimer)
+    this.idleTimer = null
+  }
+
+  private clearSuspendTimer() {
+    if (this.suspendTimer === null) return
+
+    window.clearTimeout(this.suspendTimer)
+    this.suspendTimer = null
+  }
+
+  private clearTimers() {
+    this.clearIdleTimer()
+    this.clearSuspendTimer()
+  }
+}
+
+export const appActivityLifecycle = new AppActivityLifecycle()
diff --git a/src/utils/backgroundManager.ts b/src/utils/backgroundManager.ts
index 72548429..65a7b730 100644
--- a/src/utils/backgroundManager.ts
+++ b/src/utils/backgroundManager.ts
@@ -1,20 +1,24 @@
+import { appActivityLifecycle, type AppActivityState } from '@/utils/appActivityLifecycle'
+
 /**
  * 后台管理器
  * 统一管理定时器和后台活动，减少iOS系统杀掉应用的概率
  */
 export class BackgroundManager {
-  private timers: Map<string, {
-    callback: () => void
-    interval: number
-    timer: ReturnType<typeof setInterval> | null
-    pausedAt?: number
-    runInBackground?: boolean
-  }> = new Map()
-  
-  private readonly activityEvents = ['mousedown', 'mousemove', 'keypress', 'scroll', 'touchstart', 'click']
-  private readonly handleVisibilityChange = () => {
+  private timers: Map<
+    string,
+    {
+      callback: () => void
+      interval: number
+      timer: ReturnType<typeof setInterval> | null
+      pausedAt?: number
+      runInBackground?: boolean
+    }
+  > = new Map()
+
+  private readonly handleActivityStateChange = (state: AppActivityState) => {
     const wasBackground = this.isBackground
-    this.isBackground = document.hidden
+    this.isBackground = state === 'suspended'
 
     if (this.isBackground && !wasBackground) {
       console.log('Background: 进入后台，暂停定时器')
@@ -27,44 +31,30 @@ export class BackgroundManager {
   private readonly handleBeforeUnload = () => {
     this.destroy()
   }
-  private readonly updateActivity = () => {
-    this.lastActivityTime = Date.now()
-  }
 
   private isBackground = false
   private isDestroyed = false
-  private lastActivityTime = Date.now()
   private isInitialized = false
+  private releaseActivityLifecycle: (() => void) | null = null
+  private stopActivityStateSubscription: (() => void) | null = null
 
   private ensureInitialized() {
     if (this.isInitialized || this.isDestroyed) return
 
     this.isInitialized = true
-    this.isBackground = document.hidden
-    this.setupVisibilityListener()
-    this.setupActivityTracking()
-  }
-
-  private setupVisibilityListener() {
-    document.addEventListener('visibilitychange', this.handleVisibilityChange)
+    this.releaseActivityLifecycle = appActivityLifecycle.acquire()
+    this.stopActivityStateSubscription = appActivityLifecycle.subscribe(this.handleActivityStateChange)
     window.addEventListener('beforeunload', this.handleBeforeUnload)
   }
 
-  private setupActivityTracking() {
-    // 按需跟踪用户活动，避免应用启动时就注册一批全局监听。
-    this.activityEvents.forEach(event => {
-      document.addEventListener(event, this.updateActivity, { passive: true })
-    })
-  }
-
   private removeLifecycleListeners() {
     if (!this.isInitialized) return
 
-    document.removeEventListener('visibilitychange', this.handleVisibilityChange)
     window.removeEventListener('beforeunload', this.handleBeforeUnload)
-    this.activityEvents.forEach(event => {
-      document.removeEventListener(event, this.updateActivity)
-    })
+    this.stopActivityStateSubscription?.()
+    this.stopActivityStateSubscription = null
+    this.releaseActivityLifecycle?.()
+    this.releaseActivityLifecycle = null
     this.isInitialized = false
   }
 
@@ -72,32 +62,32 @@ export class BackgroundManager {
    * 添加定时器
    */
   addTimer(
-    id: string, 
-    callback: () => void, 
-    interval: number, 
+    id: string,
+    callback: () => void,
+    interval: number,
     options: {
       runInBackground?: boolean
       skipInitialRun?: boolean
-    } = {}
+    } = {},
   ) {
     const { runInBackground = false, skipInitialRun = false } = options
 
     if (this.isDestroyed) return
     this.ensureInitialized()
-    
+
     this.removeTimer(id)
-    
+
     const timerConfig = {
       callback,
       interval,
       timer: null as ReturnType<typeof setInterval> | null,
-      runInBackground
+      runInBackground,
     }
 
     // 创建定时器
     const wrappedCallback = () => {
       if (this.isDestroyed) return
-      
+
       // 只有在前台运行，或者明确允许后台运行时才执行
       if (!this.isBackground || runInBackground) {
         try {
@@ -159,7 +149,7 @@ export class BackgroundManager {
       if (!timerConfig.timer) {
         const wrappedCallback = () => {
           if (this.isDestroyed) return
-          
+
           if (!this.isBackground || timerConfig.runInBackground) {
             try {
               timerConfig.callback()
@@ -199,7 +189,7 @@ export class BackgroundManager {
       interval: config.interval,
       status: config.timer ? 'running' : 'paused',
       runInBackground: config.runInBackground || false,
-      pausedAt: config.pausedAt
+      pausedAt: config.pausedAt,
     }))
   }
 
@@ -207,14 +197,14 @@ export class BackgroundManager {
    * 检查用户是否活跃
    */
   isUserActive(maxInactiveTime = 5 * 60 * 1000): boolean {
-    return Date.now() - this.lastActivityTime < maxInactiveTime
+    return Date.now() - appActivityLifecycle.getLastActivityAt() < maxInactiveTime
   }
 
   /**
    * 获取最后活动时间
    */
   getLastActivityTime(): number {
-    return this.lastActivityTime
+    return appActivityLifecycle.getLastActivityAt()
   }
 
   /**
@@ -231,8 +221,8 @@ export class BackgroundManager {
       isBackground: this.isBackground,
       isDestroyed: this.isDestroyed,
       timerCount: this.timers.size,
-      lastActivityTime: this.lastActivityTime,
-      isUserActive: this.isUserActive()
+      lastActivityTime: appActivityLifecycle.getLastActivityAt(),
+      isUserActive: this.isUserActive(),
     }
   }
 
@@ -241,7 +231,7 @@ export class BackgroundManager {
    */
   destroy() {
     this.isDestroyed = true
-    
+
     // 清理所有定时器
     this.timers.forEach((timerConfig, id) => {
       if (timerConfig.timer) {
@@ -266,13 +256,13 @@ export const backgroundManager = new BackgroundManager()
  * 便捷的定时器管理函数
  */
 export function addBackgroundTimer(
-  id: string, 
-  callback: () => void, 
-  interval: number, 
+  id: string,
+  callback: () => void,
+  interval: number,
   options?: {
     runInBackground?: boolean
     skipInitialRun?: boolean
-  }
+  },
 ) {
   backgroundManager.addTimer(id, callback, interval, options)
 }
diff --git a/src/utils/backgroundRotation.ts b/src/utils/backgroundRotation.ts
new file mode 100644
index 00000000..fe0029d3
--- /dev/null
+++ b/src/utils/backgroundRotation.ts
@@ -0,0 +1,20 @@
+interface PreloadedBackgroundRotationOptions {
+  /** 提交前重新判断当前生命周期和请求版本是否仍允许切换。 */
+  canCommit: () => boolean
+  /** 将已经完成预加载的壁纸切换为活动背景。 */
+  commit: () => void
+  /** 预加载目标壁纸，并以布尔值表示是否可安全显示。 */
+  preload: () => Promise<boolean>
+}
+
+/**
+ * 将壁纸预加载与最终提交分离，确保异步加载期间失效的轮换请求不会改变可见背景。
+ */
+export async function commitPreloadedBackgroundRotation(options: PreloadedBackgroundRotationOptions) {
+  const succeeded = await options.preload()
+
+  if (!succeeded || !options.canCommit()) return false
+
+  options.commit()
+  return true
+}