优化

web/src/components/Layout.tsx

@@ -89,6 +89,7 @@ export function Layout() {
         )}
         <LayoutWorkspace
           routeKey={location.pathname}
+          scrollKey={`${location.pathname}${location.search}`}
           userKey={user?.id}
           showMobileBottomNav={showMobileBottomNav}
         />

web/src/components/LayoutSections.tsx

@@ -31,6 +31,8 @@ type LayoutSidebarsProps = Omit<
 
 type LayoutWorkspaceProps = {
   routeKey: string
+  /** 滚动记忆的 key：含 query，让同一路径下的不同视图（如剧集面板）各记一份位置。 */
+  scrollKey?: string
   userKey?: string
   showMobileBottomNav?: boolean
 }
@@ -113,10 +115,11 @@ export function LayoutSidebars({
 
 export function LayoutWorkspace({
   routeKey,
+  scrollKey,
   userKey = 'anonymous',
   showMobileBottomNav = false,
 }: LayoutWorkspaceProps) {
-  useScrollMemory(routeKey, userKey)
+  useScrollMemory(scrollKey ?? routeKey, userKey)
 
   const bottomPad = showMobileBottomNav
     ? 'pb-[calc(3.75rem+env(safe-area-inset-bottom,0px))] lg:pb-10'

web/src/components/MediaCard.tsx

@@ -10,13 +10,14 @@ const ACTION_OVERLAY_CLASS =
 // memo：父级状态变化（如轮播切图、其它卡片操作）不再级联重渲染所有卡片。
 // 注意 actions/renderActions 必须引用稳定（用 renderActions 传函数）memo 才生效。
 export const MediaCard = memo(function MediaCard({
-  media, progress, count, rating, linkTo, onClick, actions, renderActions, compact,
+  media, progress, count, rating, linkTo, linkState, onClick, actions, renderActions, compact,
 }: {
   media: Media
   progress?: number
   count?: number
   rating?: number
   linkTo?: string
+  linkState?: { from?: string }
   onClick?: () => void
   actions?: ReactNode
   renderActions?: (media: Media) => ReactNode
@@ -169,7 +170,7 @@ export const MediaCard = memo(function MediaCard({
   if (actionContent) {
     return (
       <div className="group relative block">
-        <Link to={href} className="block">
+        <Link to={href} state={linkState} className="block">
           {card}
         </Link>
         <div className={ACTION_OVERLAY_CLASS}>
@@ -180,7 +181,7 @@ export const MediaCard = memo(function MediaCard({
   }
 
   return (
-    <Link to={href} className="group block">
+    <Link to={href} state={linkState} className="group block">
         {card}
     </Link>
   )

web/src/hooks/useScrollMemory.test.ts

@@ -1,4 +1,10 @@
-import { shouldPersistScrollSample, shouldRememberScroll } from './useScrollMemory.ts'
+import {
+  isJumpIntentKey,
+  isScrollIntentKey,
+  shouldPersistClampedSample,
+  shouldPersistScrollSample,
+  shouldRememberScroll,
+} from './useScrollMemory.ts'
 
 function check(name: string, condition: boolean) {
   if (!condition) throw new Error(`useScrollMemory: ${name}`)
@@ -7,6 +13,7 @@ function check(name: string, condition: boolean) {
 check('home remembers scroll', shouldRememberScroll('/'))
 check('library list remembers scroll', shouldRememberScroll('/libraries'))
 check('library detail remembers scroll', shouldRememberScroll('/library/lib-1'))
+check('library series panel remembers scroll', shouldRememberScroll('/library/lib-1'))
 check('media detail remembers scroll', shouldRememberScroll('/media/media-1'))
 check('settings does not remember scroll', !shouldRememberScroll('/settings'))
 check('player does not remember scroll', !shouldRememberScroll('/play/media-1'))
@@ -48,4 +55,48 @@ check(
   }),
 )
 
+// 恢复途中内容还没长出来（滚不动）或被钳在矮内容底部时，scrollTop 是浏览器钳制
+// 出来的值，不能写回存储，否则一次误触就把记忆位置清成 0。
+check(
+  'clamped sample while list is still loading is ignored',
+  !shouldPersistClampedSample({ current: 0, maxScroll: 0, saved: 1800 }),
+)
+check(
+  'clamped sample at the bottom of a shrunken list is ignored',
+  !shouldPersistClampedSample({ current: 1200, maxScroll: 1200, saved: 1800 }),
+)
+check(
+  'sample at the bottom of a completely scrolled list stays persistable',
+  shouldPersistClampedSample({ current: 1800, maxScroll: 1800, saved: 1800 }),
+)
+check(
+  'reachable scroll position is persisted',
+  shouldPersistClampedSample({ current: 900, maxScroll: 1200, saved: 1800 }),
+)
+check(
+  'reaching the remembered target is persisted',
+  shouldPersistClampedSample({ current: 1800, maxScroll: 2600, saved: 1800 }),
+)
+check(
+  'deeper than the remembered target is persisted',
+  shouldPersistClampedSample({ current: 3000, maxScroll: 4000, saved: 1800 }),
+)
+check(
+  'intentional scroll to top of a tall list is persisted',
+  shouldPersistClampedSample({ current: 0, maxScroll: 4000, saved: 1800 }),
+)
+check(
+  'unscrollable page without memory cannot persist',
+  !shouldPersistClampedSample({ current: 0, maxScroll: 0, saved: 0 }),
+)
+
+check('page down counts as scroll intent', isScrollIntentKey('PageDown'))
+check('space counts as scroll intent', isScrollIntentKey(' '))
+check('typing does not count as scroll intent', !isScrollIntentKey('a'))
+check('shortcut does not count as scroll intent', !isScrollIntentKey('Meta'))
+check('page down allows a long jump', isJumpIntentKey('PageDown'))
+check('home allows a long jump', isJumpIntentKey('Home'))
+check('arrow key keeps smooth-only intent', !isJumpIntentKey('ArrowDown'))
+check('space keeps smooth-only intent', !isJumpIntentKey(' '))
+
 console.log('useScrollMemory.test.ts ok')

web/src/hooks/useScrollMemory.ts

@@ -3,6 +3,36 @@ import { useLayoutEffect } from 'react'
 const SCROLL_STORAGE_PREFIX = 'mebox.scroll.'
 const scrollPositions = new Map<string, number>()
 
+/**
+ * 用户滚动意图的有效期：滚轮 / 触摸 / 翻页键之后这段时间内的 scroll 事件才算
+ * “用户自己滚出来的位置”。连续滚动（含惯性）期间每个 scroll 事件都会续期，
+ * 所以正常滑动不会中途过期，而恢复回填 / 虚拟列表量高这类程序化位移会被排除。
+ */
+const USER_SCROLL_INTENT_TTL_MS = 800
+
+/** 平滑滚动（滚轮/触摸/方向键）单次采样允许的最大“向上跳”距离。 */
+function maxSmoothJumpUp(viewportHeight: number): number {
+  return Math.max(viewportHeight * 2, 1200)
+}
+
+/** 会滚动容器的按键。 */
+export function isScrollIntentKey(key: string): boolean {
+  return (
+    key === 'PageDown' ||
+    key === 'PageUp' ||
+    key === 'Home' ||
+    key === 'End' ||
+    key === 'ArrowDown' ||
+    key === 'ArrowUp' ||
+    key === ' '
+  )
+}
+
+/** 一次按键可能直接跳很远（首页/末页/翻页），这些不算异常向上跳。 */
+export function isJumpIntentKey(key: string): boolean {
+  return key === 'PageDown' || key === 'PageUp' || key === 'Home' || key === 'End'
+}
+
 function readScrollPosition(key: string): number {
   const cached = scrollPositions.get(key)
   if (cached !== undefined) return cached
@@ -56,21 +86,54 @@ export function shouldPersistScrollSample(input: {
   return true
 }
 
+/**
+ * 判断一次滚动采样是不是“用户真正选中的位置”。
+ *
+ * 内容还在加载（容器根本滚不动）或被钳在“变矮内容”的底部时，scrollTop 是浏览器
+ * 钳制出来的值：恢复途中任何一次滚轮 / 触摸 / 按键都会读到这个值，写回存储就会把
+ * 记忆位置抹成 0（表现为返回媒体库时永远停在顶部，且之后再也不会记录）。
+ */
+export function shouldPersistClampedSample(input: {
+  current: number
+  maxScroll: number
+  saved: number
+}): boolean {
+  const { current, maxScroll, saved } = input
+  if (maxScroll <= 0) {
+    return false
+  }
+  if (current >= maxScroll && current < saved) {
+    return false
+  }
+  return true
+}
+
 /**
  * 记住列表页的滚动位置。页面内容会异步长高，因此恢复期间会监听内容高度，
  * 直到目标位置可达；期间用户主动滚动会立即接管，避免和恢复逻辑抢滚动条。
+ *
+ * 恢复还没完成时，容器里的 scrollTop 往往是浏览器钳制出来的值（内容还在加载
+ * 占位，或被钳在变矮内容的底部）。这种采样既不写回存储，也不当成用户“接管”，
+ * 否则一次误触的滚轮 / 触摸就会把记忆位置清成 0。
+ *
+ * 只有带“用户滚动意图”（滚轮 / 触摸 / 翻页键 / 拖滚动条）的 scroll 事件才会写
+ * 存储：恢复回填、虚拟列表挂载量高、浏览器钳制造成的位移都不算用户选择的位置。
+ *
+ * routeKey 允许包含 query：媒体库详情页的剧集面板（`/library/:id?series=...`）
+ * 与网格视图是两块不同内容，各自记一份位置，互不覆盖。
  */
-export function useScrollMemory(pathname: string, userKey = 'anonymous'): void {
+export function useScrollMemory(routeKey: string, userKey = 'anonymous'): void {
   useLayoutEffect(() => {
     const el = document.getElementById('app-main-scroll')
     if (!el) return
 
+    const pathname = routeKey.split('?')[0]
     if (!shouldRememberScroll(pathname)) {
       el.scrollTop = 0
       return
     }
 
-    const key = `${userKey}:${pathname}`
+    const key = `${userKey}:${routeKey}`
     const saved = readScrollPosition(key)
     let restoring = saved > 0
     let observer: ResizeObserver | null = null
@@ -79,6 +142,36 @@ export function useScrollMemory(pathname: string, userKey = 'anonymous'): void {
     let restorePumpUntil = 0
     let lastSaved = saved
     let lastHeight = el.scrollHeight
+    // 最近一次“用户主动滚动”的时间戳与类型（滚轮 / 触摸 / 翻页键 / 拖滚动条）。
+    // 只有用户自己滚出来的位置才写回存储：恢复逻辑、虚拟列表挂载量高、浏览器
+    // 钳制造成的 scrollTop 变化都不代表用户想要的位置，写进去就会把记忆抹掉。
+    let userScrollUntil = 0
+    let userScrollAllowsJump = false
+    const markUserScroll = (allowsJump = false) => {
+      const now = performance.now()
+      // 上一段意图已过期：新的一段从“只允许小幅向上跳”开始。
+      if (userScrollUntil <= now) {
+        userScrollAllowsJump = false
+      }
+      userScrollUntil = now + USER_SCROLL_INTENT_TTL_MS
+      if (allowsJump) {
+        userScrollAllowsJump = true
+      }
+    }
+    const userScrolling = () => userScrollUntil > performance.now()
+
+    const currentMaxScroll = () => Math.max(0, el.scrollHeight - el.clientHeight)
+
+    // 只有“用户真正能滚到”的位置才算有效采样：内容还在加载占位（滚不动）或
+    // 被钳在变矮内容的底部时，scrollTop 都是浏览器钳制出来的值。
+    const sampleIsTrustworthy = (current: number) =>
+      shouldPersistClampedSample({ current, maxScroll: currentMaxScroll(), saved })
+
+    const adoptScrollPosition = (current: number) => {
+      lastSaved = current
+      lastHeight = el.scrollHeight
+      writeScrollPosition(key, current)
+    }
 
     const stopRestore = () => {
       if (restoreFrame) {
@@ -97,14 +190,18 @@ export function useScrollMemory(pathname: string, userKey = 'anonymous'): void {
       if (!restoring) return
       restoring = false
       stopRestore()
-      lastSaved = Math.round(el.scrollTop)
-      lastHeight = el.scrollHeight
-      writeScrollPosition(key, lastSaved)
+      const current = Math.round(el.scrollTop)
+      if (!sampleIsTrustworthy(current)) {
+        // 目标一直不可达（内容仍比记忆位置矮 / 还在加载）：保留原记忆值，
+        // 不要把钳制出来的位置写回去。
+        return
+      }
+      adoptScrollPosition(current)
     }
 
     const tryRestore = () => {
       if (!restoring) return
-      const max = Math.max(0, el.scrollHeight - el.clientHeight)
+      const max = currentMaxScroll()
       const target = Math.min(saved, max)
       if (target > 0 && Math.abs(el.scrollTop - target) > 1) {
         el.scrollTop = target
@@ -125,8 +222,30 @@ export function useScrollMemory(pathname: string, userKey = 'anonymous'): void {
     }
 
     const saveNow = () => {
-      if (restoring) return
       const current = Math.round(el.scrollTop)
+      const userDriven = userScrolling()
+      // 惯性/连续滚动期间持续续期，避免长距离滑动中途被判定为“非用户滚动”。
+      if (userDriven) markUserScroll(userScrollAllowsJump)
+      // 内容还没长回来时读到的 scrollTop 不是用户选的位置，既不能写存储，
+      // 也不能当成“用户接管”。
+      if (!sampleIsTrustworthy(current)) return
+      // 一瞬间大幅向上跳（恢复回填、虚拟列表挂载量高、浏览器钳制）只有按键翻页 /
+      // 拖滚动条这类意图才可能是用户行为，否则直接丢弃。
+      const upJump = lastSaved > current ? lastSaved - current : 0
+      if (upJump > maxSmoothJumpUp(el.clientHeight) && !(userDriven && userScrollAllowsJump)) {
+        return
+      }
+      if (restoring) {
+        if (!userDriven || Math.abs(current - saved) <= 1) return
+        // 恢复途中用户真的滚到了别处：交还控制权并记录这个位置，避免恢复
+        // 逻辑继续和用户抢滚动条。
+        restoring = false
+        stopRestore()
+        adoptScrollPosition(current)
+        return
+      }
+      // 非用户滚动（恢复逻辑回填、虚拟列表挂载/量高、浏览器钳制）不写存储。
+      if (!userDriven) return
       const height = el.scrollHeight
       if (
         !shouldPersistScrollSample({
@@ -136,7 +255,6 @@ export function useScrollMemory(pathname: string, userKey = 'anonymous'): void {
           lastHeight,
         })
       ) {
-        lastHeight = height
         return
       }
       lastHeight = height
@@ -145,13 +263,13 @@ export function useScrollMemory(pathname: string, userKey = 'anonymous'): void {
       writeScrollPosition(key, current)
     }
 
-    const cancelRestore = () => {
-      if (!restoring) return
-      restoring = false
-      stopRestore()
-      lastSaved = Math.round(el.scrollTop)
-      lastHeight = el.scrollHeight
-      writeScrollPosition(key, lastSaved)
+    // 用户滚动意图：滚轮 / 触摸 = 平滑滚动；翻页键 / 拖滚动条 = 允许直接跳很远。
+    const onScrollIntent = () => {
+      markUserScroll(false)
+    }
+
+    const onJumpIntent = () => {
+      markUserScroll(true)
     }
 
     if (saved <= 0) {
@@ -171,42 +289,37 @@ export function useScrollMemory(pathname: string, userKey = 'anonymous'): void {
     }
 
     const onPointerDown = (event: PointerEvent) => {
+      // 点在容器本身 = 拖滚动条或在空白处按下：允许大幅跳转。
       if (event.target === el) {
-        cancelRestore()
+        onJumpIntent()
       }
       saveNow()
     }
 
     const onKeyDown = (event: KeyboardEvent) => {
-      if (
-        event.key === 'PageDown' ||
-        event.key === 'PageUp' ||
-        event.key === 'Home' ||
-        event.key === 'End' ||
-        event.key === 'ArrowDown' ||
-        event.key === 'ArrowUp' ||
-        event.key === ' '
-      ) {
-        cancelRestore()
+      if (isJumpIntentKey(event.key)) {
+        onJumpIntent()
+      } else if (isScrollIntentKey(event.key)) {
+        onScrollIntent()
       }
       saveNow()
     }
 
     el.addEventListener('scroll', saveNow, { passive: true })
     el.addEventListener('pointerdown', onPointerDown, true)
-    window.addEventListener('wheel', cancelRestore, { passive: true, capture: true })
-    window.addEventListener('touchstart', cancelRestore, { passive: true, capture: true })
+    window.addEventListener('wheel', onScrollIntent, { passive: true, capture: true })
+    window.addEventListener('touchstart', onScrollIntent, { passive: true, capture: true })
     window.addEventListener('keydown', onKeyDown, true)
 
     return () => {
       el.removeEventListener('scroll', saveNow)
       el.removeEventListener('pointerdown', onPointerDown, true)
-      window.removeEventListener('wheel', cancelRestore, true)
-      window.removeEventListener('touchstart', cancelRestore, true)
+      window.removeEventListener('wheel', onScrollIntent, true)
+      window.removeEventListener('touchstart', onScrollIntent, true)
       window.removeEventListener('keydown', onKeyDown, true)
       stopRestore()
       // 清理时写入最后一次有效位置，避免依赖已被钳制的 el.scrollTop。
       writeScrollPosition(key, lastSaved)
     }
-  }, [pathname, userKey])
+  }, [routeKey, userKey])
 }

web/src/pages/FavouritesPage.tsx

@@ -74,7 +74,7 @@ export function FavouritesPage() {
       {items.length > 0 && (
         <div className="grid grid-cols-2 gap-4 sm:grid-cols-3 md:grid-cols-4 lg:grid-cols-5 xl:grid-cols-6">
           {items.map((m) => (
-            <MediaCard key={m.id} media={m} />
+            <MediaCard key={m.id} media={m} linkState={{ from: '/favourites' }} />
           ))}
         </div>
       )}

web/src/pages/MediaDetailPageSections.tsx

@@ -85,7 +85,7 @@ export function MediaDetailBackButton({ onBack }: { onBack: () => void }) {
         className="btn-ghost gap-2 bg-white/80 shadow-sm backdrop-blur hover:bg-white"
       >
         <ArrowLeft size={16} />
-        <span>返回媒体库</span>
+        <span>返回</span>
       </button>
     </div>
   )

web/src/pages/WatchHistoryPage.tsx

@@ -127,6 +127,7 @@ export function WatchHistoryPage() {
               <div className="min-w-0 flex-1 space-y-1">
                 <Link
                   to={`/media/${m.id}`}
+                  state={{ from: '/history' }}
                   className="block truncate font-medium text-ink-600 transition hover:text-brand-500"
                 >
                   {m.title}
@@ -150,6 +151,7 @@ export function WatchHistoryPage() {
               <div className="flex w-full items-center gap-2 sm:w-auto sm:shrink-0">
                 <Link
                   to={`/play/${m.id}`}
+                  state={{ from: '/history' }}
                   className="neon-button !px-3 !py-1 !text-xs"
                 >
                   <Play size={12} /> 继续

web/src/pages/useMediaDetailPageState.ts

@@ -1,5 +1,5 @@
 import { useCallback, useEffect, useMemo, useState, type Dispatch, type SetStateAction } from 'react'
-import type { NavigateFunction } from 'react-router-dom'
+import { useLocation, type NavigateFunction } from 'react-router-dom'
 import toast from 'react-hot-toast'
 
 import { api } from '../api/client'
@@ -11,6 +11,8 @@ import type { Media } from '../types'
 import { seasonSortOrder } from '../utils/groupSeries'
 import { mediaLibraryBackTarget } from './MediaDetailPageModel'
 
+type MediaDetailLocationState = { from?: string } | null
+
 interface MediaDetailPageStateParams {
   id: string
   navigate: NavigateFunction
@@ -29,6 +31,7 @@ interface MediaDetailActionsParams {
   media: Media | null
   scrapeEpisodeArtwork: boolean
   navigate: NavigateFunction
+  backFrom: string | undefined
   refresh: () => Promise<void>
   setFavourite: Dispatch<SetStateAction<boolean>>
 }
@@ -54,10 +57,13 @@ export function useMediaDetailPageState({ id, navigate }: MediaDetailPageStatePa
     setEpisodes,
     setLoadingEpisodes,
   })
+  const location = useLocation()
+  const backFrom = (location.state as MediaDetailLocationState)?.from
   const actions = useMediaDetailActions({
     media,
     scrapeEpisodeArtwork,
     navigate,
+    backFrom,
     refresh,
     setFavourite,
   })
@@ -173,10 +179,14 @@ function useMediaDetailActions({
   media,
   scrapeEpisodeArtwork,
   navigate,
+  backFrom,
   refresh,
   setFavourite,
 }: MediaDetailActionsParams) {
-  const goBack = useCallback(() => goBackFromMediaDetail(media, navigate), [media, navigate])
+  const goBack = useCallback(
+    () => goBackFromMediaDetail(media, navigate, backFrom),
+    [backFrom, media, navigate],
+  )
   const toggleFavourite = useCallback(
     () => toggleMediaFavourite(media, setFavourite),
     [media, setFavourite],
@@ -188,13 +198,34 @@ function useMediaDetailActions({
   const reprobe = useCallback(() => reprobeMedia(media, refresh), [media, refresh])
   const exportNFO = useCallback(() => exportMediaNFO(media), [media])
   const deleteMedia = useCallback(
-    () => deleteMediaFromLibrary(media, navigate),
-    [media, navigate],
+    () => deleteMediaFromLibrary(media, navigate, backFrom),
+    [backFrom, media, navigate],
   )
   return { goBack, toggleFavourite, rescrape, reprobe, exportNFO, deleteMedia }
 }
 
-function goBackFromMediaDetail(media: Media | null, navigate: NavigateFunction, replace = false): void {
+function canNavigateHistoryBack(): boolean {
+  if (typeof window === 'undefined') return false
+  const idx = (window.history.state as { idx?: number } | null)?.idx
+  return typeof idx === 'number' ? idx > 0 : window.history.length > 1
+}
+
+function goBackFromMediaDetail(
+  media: Media | null,
+  navigate: NavigateFunction,
+  from: string | undefined,
+  replace = false,
+): void {
+  // Prefer the explicit return path (e.g. Favourites → Detail), then browser
+  // history, and only fall back to the owning library for direct/deep links.
+  if (typeof from === 'string' && from.length > 0) {
+    navigate(from, replace ? { replace: true } : undefined)
+    return
+  }
+  if (canNavigateHistoryBack()) {
+    navigate(-1)
+    return
+  }
   if (!media) {
     navigate('/libraries')
     return
@@ -259,7 +290,11 @@ async function exportMediaNFO(media: Media | null): Promise<void> {
   }
 }
 
-async function deleteMediaFromLibrary(media: Media | null, navigate: NavigateFunction): Promise<void> {
+async function deleteMediaFromLibrary(
+  media: Media | null,
+  navigate: NavigateFunction,
+  from: string | undefined,
+): Promise<void> {
   if (!media) return
   const result = await confirmActionResult({
     title: '删除媒体',
@@ -275,7 +310,7 @@ async function deleteMediaFromLibrary(media: Media | null, navigate: NavigateFun
     return
   }
   toast.success(result.checked ? '已删除媒体及本地文件' : '已从媒体库删除')
-  goBackFromMediaDetail(media, navigate, true)
+  goBackFromMediaDetail(media, navigate, from, true)
 }
 
 function apiErrorMessage(err: unknown, fallback: string): string {