diff --git a/frontend-vue/src/shared/composables/useTaskProgressLoop.ts b/frontend-vue/src/shared/composables/useTaskProgressLoop.ts
index f79fc912..f6a1b5e7 100644
--- a/frontend-vue/src/shared/composables/useTaskProgressLoop.ts
+++ b/frontend-vue/src/shared/composables/useTaskProgressLoop.ts
@@ -312,7 +312,7 @@ export function useTaskProgressLoop<TDetail>(
   }
 
   function scheduleNextDelayed(delayMs: number) {
-    if (disposed || pollTimer != null) return
+    if (disposed) return
     clearPollTimer()
     const run = () => {
       pollTimer = null
diff --git a/frontend-vue/tests/polling-visibility.test.ts b/frontend-vue/tests/polling-visibility.test.ts
new file mode 100644
index 00000000..de066c01
--- /dev/null
+++ b/frontend-vue/tests/polling-visibility.test.ts
@@ -0,0 +1,189 @@
+import { test } from 'node:test'
+import assert from 'node:assert/strict'
+import { useTaskProgressLoop } from '../src/shared/composables/useTaskProgressLoop.ts'
+import {
+  TASK_POLL_VISIBLE_INTERVAL_MS,
+  TASK_POLL_HIDDEN_INTERVAL_MS,
+  configureTaskPolling,
+  resetTaskPollingConfig,
+} from '../src/shared/task-progress-config.ts'
+
+const tick = (ms = 0) => new Promise<void>((r) => globalThis.setTimeout(r, ms))
+
+interface FakeDoc {
+  setVisibility: (state: string) => void
+  dispatch: (type: string) => void
+  listenerCount: (type: string) => number
+  listeners: (type: string) => Array<(e?: unknown) => void>
+}
+
+function installFakeDocument(initial: string): FakeDoc {
+  let state = initial
+  const listeners = new Map<string, Array<(e?: unknown) => void>>()
+  ;(globalThis as Record<string, unknown>).document = {
+    get visibilityState() { return state },
+    get hidden() { return state !== 'visible' },
+    addEventListener: (type: string, fn: (e?: unknown) => void) => {
+      const arr = listeners.get(type) ?? []
+      arr.push(fn)
+      listeners.set(type, arr)
+    },
+    removeEventListener: (type: string, fn: (e?: unknown) => void) => {
+      const arr = listeners.get(type) ?? []
+      listeners.set(type, arr.filter((f) => f !== fn))
+    },
+  }
+  return {
+    setVisibility: (s) => { state = s },
+    dispatch: (type) => { for (const fn of listeners.get(type) ?? []) fn() },
+    listenerCount: (type) => (listeners.get(type) ?? []).length,
+    listeners: (type) => listeners.get(type) ?? [],
+  }
+}
+
+function cleanupDocument() {
+  delete (globalThis as Record<string, unknown>).document
+  resetTaskPollingConfig()
+}
+
+interface TimerSinkEntry {
+  fn: () => void
+  ms: number
+}
+
+let scopeCounter = 0
+
+interface VisibilityHarness {
+  loop: ReturnType<typeof useTaskProgressLoop<{ taskId?: number; status?: string }>>
+  doc: FakeDoc
+  sink: TimerSinkEntry[]
+  fetchCount: () => number
+}
+
+async function makeVisibilityLoop(
+  visibility: string,
+  config?: { enabled?: boolean; delay?: number },
+): Promise<VisibilityHarness> {
+  if (config) {
+    const partial: Parameters<typeof configureTaskPolling>[0] = {}
+    if (config.enabled !== undefined) partial.foregroundRefreshEnabled = config.enabled
+    if (config.delay !== undefined) partial.foregroundRefreshDelayMs = config.delay
+    configureTaskPolling(partial)
+  }
+  const doc = installFakeDocument(visibility)
+  const sink: TimerSinkEntry[] = []
+  const storage = new Map<string, string>()
+  let fetchCount = 0
+  ;(globalThis as Record<string, unknown>).window = {
+    localStorage: {
+      getItem: (k: string) => storage.get(k) ?? null,
+      setItem: (k: string, v: string) => { storage.set(k, v) },
+      removeItem: (k: string) => { storage.delete(k) },
+    },
+    setTimeout: (fn: () => void, ms: number) => {
+      sink.push({ fn, ms })
+      return globalThis.setTimeout(fn, ms)
+    },
+    clearTimeout: (id: unknown) => globalThis.clearTimeout(id as number),
+    setInterval: (fn: () => void, ms: number) => globalThis.setInterval(fn, ms),
+    clearInterval: (id: unknown) => globalThis.clearInterval(id as number),
+  }
+  const loop = useTaskProgressLoop<{ taskId?: number; status?: string }>({
+    scope: `vis-${scopeCounter++}`,
+    fetchProgress: async () => {
+      fetchCount += 1
+      return { items: [] }
+    },
+    extractTaskId: (d) => d?.taskId,
+    extractStatus: (d) => d?.status,
+  })
+  loop.reset([1])
+  return { loop, doc, sink, fetchCount: () => fetchCount }
+}
+
+test('test_hidden_long_interval', async () => {
+  const h = await makeVisibilityLoop('hidden')
+  await tick(10)
+  const last = h.sink.at(-1)
+  assert.equal(last?.ms, TASK_POLL_HIDDEN_INTERVAL_MS, '隐藏时按隐藏间隔排定下一轮')
+  h.loop.dispose()
+  cleanupDocument()
+})
+
+test('test_visible_short_interval', async () => {
+  const h = await makeVisibilityLoop('visible')
+  await tick(10)
+  const last = h.sink.at(-1)
+  assert.equal(last?.ms, TASK_POLL_VISIBLE_INTERVAL_MS, '可见时按可见间隔排定下一轮')
+  h.loop.dispose()
+  cleanupDocument()
+})
+
+test('test_foreground_refresh_triggered', async () => {
+  const h = await makeVisibilityLoop('hidden')
+  await tick(10)
+  assert.equal(h.fetchCount(), 1, '初始一轮已完成')
+  h.doc.setVisibility('visible')
+  h.doc.dispatch('visibilitychange')
+  await tick(10)
+  assert.equal(h.fetchCount(), 2, '切回可见立即刷新一轮')
+  h.loop.dispose()
+  cleanupDocument()
+})
+
+test('test_foreground_refresh_disabled', async () => {
+  const h = await makeVisibilityLoop('hidden', { enabled: false })
+  await tick(10)
+  h.doc.setVisibility('visible')
+  h.doc.dispatch('visibilitychange')
+  await tick(10)
+  assert.equal(h.fetchCount(), 1, '开关关闭时切回可见不刷新')
+  h.loop.dispose()
+  cleanupDocument()
+})
+
+test('test_foreground_refresh_delayed', async () => {
+  const h = await makeVisibilityLoop('hidden', { delay: 300 })
+  await tick(10)
+  h.doc.setVisibility('visible')
+  h.doc.dispatch('visibilitychange')
+  assert.ok(h.sink.some((t) => t.ms === 300), '按配置延迟排定刷新定时器')
+  await tick(100)
+  assert.equal(h.fetchCount(), 1, '延迟期内不刷新')
+  await tick(300)
+  assert.equal(h.fetchCount(), 2, '延迟到点后刷新一轮')
+  h.loop.dispose()
+  cleanupDocument()
+})
+
+test('test_hidden_polling_continues', async () => {
+  const h = await makeVisibilityLoop('hidden')
+  await tick(10)
+  assert.ok(h.sink.some((t) => t.ms === TASK_POLL_HIDDEN_INTERVAL_MS), '隐藏间隔定时器已排定')
+  const before = h.fetchCount()
+  await h.loop.refreshOnce()
+  assert.equal(h.fetchCount(), before + 1, '隐藏期间手动轮询仍工作')
+  assert.deepEqual(h.loop.taskIds.value, [1], '降频不改任务集合')
+  h.loop.dispose()
+  cleanupDocument()
+})
+
+test('test_visibility_event_bound_unbound', async () => {
+  const h = await makeVisibilityLoop('hidden')
+  assert.equal(h.doc.listenerCount('visibilitychange'), 1, '创建时绑定 visibilitychange')
+  const handler = h.doc.listeners('visibilitychange')[0]
+  h.loop.dispose()
+  assert.equal(h.doc.listenerCount('visibilitychange'), 0, 'dispose 后解绑')
+  assert.equal(typeof handler, 'function')
+  cleanupDocument()
+})
+
+test('test_hidden_no_immediate_refresh', async () => {
+  const h = await makeVisibilityLoop('hidden')
+  await tick(10)
+  h.doc.dispatch('visibilitychange')
+  await tick(10)
+  assert.equal(h.fetchCount(), 1, '隐藏状态下的事件不触发即时刷新')
+  h.loop.dispose()
+  cleanupDocument()
+})