refactor(R2.2): 配置更新分发 790 行摘出 ReadBookViewModel

剩余最大一块。ReadBookViewModel 4903 → 4127 行。

handleConfigUpdate（671 行 158 分支）+ toReadStyleMutation + 5 个 mutation
辅助共 790 行摘成 ReadConfigUpdateDelegate。

和前三个域不同，这块**没有自持状态**——它写的 menuConfig 是阅读器 chrome
的状态、被菜单栏读，所以留在 ReadBookUiState，经 Host 回写。依赖面本就
很窄（79× readSettingsRepository / 77× viewModelScope / 39× _uiState /
4× _effects / 1× styleGateway，无 DAO、无 ReadBook、无 context），
Host 只需 4 个成员：
- menuConfig（2 处分支要读旧值做回退判断）
- updateMenuConfig(transform)（34 处单行 + 2 处多行写入）
- refreshConfigSnapshots()（styleMutation == null 的那条分支，是排版快照
  三条重建通道里的第三条，R1.1 的注释仍在 collectReadStyle 上）
- resetDayNightReminderDismissal()（AutoSuggestDayNight 打开时清标记，
  标记本身属 reminder 域，留在 VM）

5 个 xxxMutation 辅助提成同包顶层 internal——VM 里另有 10 处在用
（selectFont / colorSelected 等），不能一起搬走。

改写用括号配平的结构化转换器做，不用正则。搬迁后做了对括号不敏感的归一化
多重集比对：**524 条语义行完全对上，零漏搬零新增**。

护栏：DOMAINS 表加一条。该域无状态，stateFields 为空，靠
stateTypes = listOf("is ConfigUpdate.") 守住「158 分支不回流 VM」。
已注入回归反证两条断言变红。

验证：testAppDebugUnitTest(426 passed) + lintAppDebug +
verifyConfigArchitecture + assembleAppDebug 全绿（与 CI verify.yml 同一组）。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt

@@ -321,6 +321,39 @@ class ReadBookViewModel(
 
     val contentEditState = contentEditDelegate.uiState
 
+    // --- 配置更新分发（无自持状态，menuConfig 仍在 ReadBookUiState）---
+
+    private val configUpdateDelegate = ReadConfigUpdateDelegate(
+        scope = viewModelScope,
+        host = object : ReadConfigUpdateDelegate.Host {
+            override val menuConfig: ReadMenuConfig get() = _uiState.value.menuConfig
+
+            override fun updateMenuConfig(transform: (ReadMenuConfig) -> ReadMenuConfig) {
+                _uiState.update { it.copy(menuConfig = transform(it.menuConfig)) }
+            }
+
+            override fun refreshConfigSnapshots() {
+                _uiState.update {
+                    it.copy(
+                        styleConfig = buildStyleConfig(),
+                        sheetConfig = buildSheetConfig(),
+                    )
+                }
+            }
+
+            override fun emitEffect(effect: ReadBookEffect) {
+                _effects.tryEmit(effect)
+            }
+
+            override fun resetDayNightReminderDismissal() {
+                hasDismissedDarkReminder = false
+                hasDismissedLightReminder = false
+            }
+        },
+        readSettingsRepository = readSettingsRepository,
+        readBookStyleConfigRepository = readBookStyleConfigRepository,
+    )
+
     private val sysEngines: List<TextToSpeech.EngineInfo> by lazy {
         val tts = TextToSpeech(context, null)
         val engines = tts.engines
@@ -583,7 +616,7 @@ class ReadBookViewModel(
                 replaceRuleRepository.insert(intent.rule.copy(isEnabled = false))
             }
             ReadBookIntent.DisableChineseConverter -> {
-                handleConfigUpdate(ConfigUpdate.ChineseConverterType(0))
+                configUpdateDelegate.handle(ConfigUpdate.ChineseConverterType(0))
             }
             ReadBookIntent.DisableReSegment -> {
                 ReadBook.book?.setReSegment(false)
@@ -944,7 +977,7 @@ class ReadBookViewModel(
 
             is ReadBookIntent.RemoveFromBookshelf -> removeFromBookshelf()
             is ReadBookIntent.UpdateConfig -> {
-                handleConfigUpdate(intent.update)
+                configUpdateDelegate.handle(intent.update)
             }
             is ReadBookIntent.AddHighlightRule -> highlightRuleDelegate.startAddRule()
             is ReadBookIntent.EditHighlightRule ->
@@ -1538,7 +1571,7 @@ class ReadBookViewModel(
             }
             is ReadBookIntent.AddReadStyleConfig -> {
                 val newIndex = readBookStyleConfigRepository.addStyle()
-                handleConfigUpdate(ConfigUpdate.StyleSelect(newIndex))
+                configUpdateDelegate.handle(ConfigUpdate.StyleSelect(newIndex))
             }
             is ReadBookIntent.DeleteCurrentReadStyleConfig -> {
                 if (readBookStyleConfigRepository.deleteCurrentStyle()) {
@@ -3507,802 +3540,6 @@ class ReadBookViewModel(
     }
 
     @Suppress("LongMethod")
-    private fun handleConfigUpdate(update: ConfigUpdate) {
-        val styleMutation = update.toReadStyleMutation()
-        styleMutation?.let(readBookStyleConfigRepository::updateCurrentStyle)
-        when (update) {
-            // --- Text style ---
-            is ConfigUpdate.TextSize,
-            is ConfigUpdate.LetterSpacing,
-            is ConfigUpdate.LineSpacing,
-            is ConfigUpdate.ParagraphSpacing,
-            is ConfigUpdate.ParagraphIndent,
-            is ConfigUpdate.TextItalic,
-            is ConfigUpdate.TextBold,
-            is ConfigUpdate.TextColor,
-            is ConfigUpdate.TextAccentColor -> Unit
-
-            // --- Title style ---
-            is ConfigUpdate.TitleMode,
-            is ConfigUpdate.TitleBold,
-            is ConfigUpdate.TitleSegScaling,
-            is ConfigUpdate.TitleLineSpacingExtra,
-            is ConfigUpdate.TitleLineSpacingSub,
-            is ConfigUpdate.TitleSize,
-            is ConfigUpdate.TitleTopSpacing,
-            is ConfigUpdate.TitleBottomSpacing,
-            is ConfigUpdate.TitleColor,
-            is ConfigUpdate.TitleColorNight,
-            is ConfigUpdate.TitleFont,
-            is ConfigUpdate.TitleSegType,
-            is ConfigUpdate.TitleSegDistance,
-            is ConfigUpdate.TitleSegFlag -> Unit
-
-            // --- Header / footer tips ---
-            is ConfigUpdate.HeaderMode,
-            is ConfigUpdate.FooterMode,
-            is ConfigUpdate.TipHeaderLeft,
-            is ConfigUpdate.TipHeaderMiddle,
-            is ConfigUpdate.TipHeaderRight,
-            is ConfigUpdate.TipFooterLeft,
-            is ConfigUpdate.TipFooterMiddle,
-            is ConfigUpdate.TipFooterRight,
-            is ConfigUpdate.CustomTipHeaderLeft,
-            is ConfigUpdate.CustomTipHeaderMiddle,
-            is ConfigUpdate.CustomTipHeaderRight,
-            is ConfigUpdate.CustomTipFooterLeft,
-            is ConfigUpdate.CustomTipFooterMiddle,
-            is ConfigUpdate.CustomTipFooterRight,
-            is ConfigUpdate.HeaderFont,
-            is ConfigUpdate.HeaderFontSize,
-            is ConfigUpdate.FooterFont,
-            is ConfigUpdate.FooterFontSize,
-            is ConfigUpdate.ApplyHeaderStyle,
-            is ConfigUpdate.TipHeaderColor,
-            is ConfigUpdate.TipHeaderColorNight,
-            is ConfigUpdate.TipFooterColor,
-            is ConfigUpdate.TipFooterColorNight,
-            is ConfigUpdate.TipDividerColor -> Unit
-
-            // --- Layout / style ---
-            is ConfigUpdate.StyleSelect -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setStyleSelect(ReadSessionState.isComic, update.index)
-                }
-            }
-            is ConfigUpdate.ShareLayout -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setShareLayout(update.value)
-                }
-            }
-            is ConfigUpdate.PageAnim -> Unit
-
-            // --- Menu appearance ---
-            is ConfigUpdate.MenuBgColor -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuBgColor(update.color)
-                }
-                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
-            }
-            is ConfigUpdate.MenuAccentColor -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuAccentColor(update.color)
-                }
-                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
-            }
-            is ConfigUpdate.MenuContainerColor -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuContainerColor(update.color)
-                }
-                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
-            }
-            is ConfigUpdate.MenuBgColorNight -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuBgColorNight(update.color)
-                }
-                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
-            }
-            is ConfigUpdate.MenuAccentColorNight -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuAccentColorNight(update.color)
-                }
-                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
-            }
-            is ConfigUpdate.MenuContainerColorNight -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuContainerColorNight(update.color)
-                }
-                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
-            }
-            is ConfigUpdate.MenuTextColor -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuTextColor(update.color)
-                }
-                _uiState.update {
-                    it.copy(menuConfig = it.menuConfig.copy(readMenuTextColor = update.color))
-                }
-            }
-            is ConfigUpdate.MenuTextColorNight -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuTextColorNight(update.color)
-                }
-                _uiState.update {
-                    it.copy(menuConfig = it.menuConfig.copy(readMenuTextColorNight = update.color))
-                }
-            }
-            is ConfigUpdate.MenuColorMode -> {
-                val value = update.value.coerceIn(0, 1)
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuColorMode(value)
-                }
-                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
-            }
-            is ConfigUpdate.ReadBarStyle -> {
-                val value = update.value.coerceIn(0, 2)
-                viewModelScope.launch {
-                    readSettingsRepository.setReadBarStyle(value)
-                }
-                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
-            }
-
-            // --- Menu bar border ---
-            is ConfigUpdate.BorderWidth -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuBorderWidth(update.value)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(readMenuBorderWidth = update.value)) }
-            }
-            is ConfigUpdate.BorderColor -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuBorderColor(update.color)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(readMenuBorderColor = update.color)) }
-            }
-            is ConfigUpdate.BorderColorNight -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuBorderColorNight(update.color)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(readMenuBorderColorNight = update.color)) }
-            }
-
-            // --- Shadow ---
-            is ConfigUpdate.TextShadow,
-            is ConfigUpdate.ShadowRadius,
-            is ConfigUpdate.ShadowDx,
-            is ConfigUpdate.ShadowDy,
-            is ConfigUpdate.ShadowColor -> Unit
-
-            // --- Underline ---
-            is ConfigUpdate.Underline,
-            is ConfigUpdate.DottedLine,
-            is ConfigUpdate.UnderlineExtend,
-            is ConfigUpdate.UnderlineHeight,
-            is ConfigUpdate.UnderlinePadding,
-            is ConfigUpdate.DottedBase,
-            is ConfigUpdate.DottedRatio,
-            is ConfigUpdate.UnderlineColor -> Unit
-
-            // --- Body padding ---
-            is ConfigUpdate.PaddingTop,
-            is ConfigUpdate.PaddingBottom,
-            is ConfigUpdate.PaddingLeft,
-            is ConfigUpdate.PaddingRight -> Unit
-
-            // --- Header padding ---
-            is ConfigUpdate.HeaderPaddingTop,
-            is ConfigUpdate.HeaderPaddingBottom,
-            is ConfigUpdate.HeaderPaddingLeft,
-            is ConfigUpdate.HeaderPaddingRight,
-            is ConfigUpdate.ShowHeaderLine -> Unit
-
-            // --- Footer padding ---
-            is ConfigUpdate.FooterPaddingTop,
-            is ConfigUpdate.FooterPaddingBottom,
-            is ConfigUpdate.FooterPaddingLeft,
-            is ConfigUpdate.FooterPaddingRight,
-            is ConfigUpdate.ShowFooterLine -> Unit
-
-            // --- Background / display ---
-            is ConfigUpdate.BgStr,
-            is ConfigUpdate.BgStrNight,
-            is ConfigUpdate.BgStrEInk,
-            is ConfigUpdate.BgType,
-            is ConfigUpdate.BgTypeNight,
-            is ConfigUpdate.BgTypeEInk,
-            is ConfigUpdate.BgAlpha,
-            is ConfigUpdate.StatusIconDark,
-            is ConfigUpdate.StyleName -> Unit
-            is ConfigUpdate.MenuIconShowText -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuIconShowText(update.value)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(readMenuIconShowText = update.value)) }
-            }
-            is ConfigUpdate.MenuIconStyle -> {
-                val value = update.value.coerceIn(0, 2)
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuIconStyle(value)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(readMenuIconStyle = value)) }
-            }
-            is ConfigUpdate.TitleBarIconStyle -> {
-                val value = update.value.coerceIn(0, 2)
-                viewModelScope.launch {
-                    readSettingsRepository.setTitleBarIconStyle(value)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(titleBarIconStyle = value)) }
-            }
-            is ConfigUpdate.MenuIconItemsPerRow -> {
-                val value = update.value.coerceIn(2, 8)
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuIconItemsPerRow(value)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(readMenuIconItemsPerRow = value)) }
-            }
-            is ConfigUpdate.MenuIconRowCount -> {
-                val value = update.value.coerceIn(1, 2)
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuIconRowCount(value)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(readMenuIconRowCount = value)) }
-            }
-            is ConfigUpdate.MenuBottomCornerRadius -> {
-                val value = update.value.coerceIn(0, 32)
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuBottomCornerRadius(value)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(readMenuBottomCornerRadius = value)) }
-            }
-            is ConfigUpdate.FloatingBottomBar -> {
-                val needsBlurFallback = !update.value &&
-                        _uiState.value.menuConfig.readMenuBottomBarBlurMode ==
-                        ReadMenuBlurMode.LiquidGlass
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuFloatingBottomBar(update.value)
-                    if (needsBlurFallback) {
-                        readSettingsRepository.setReadMenuBottomBarBlurMode(ReadMenuBlurMode.Haze)
-                    }
-                }
-                _uiState.update {
-                    it.copy(
-                        menuConfig = it.menuConfig.copy(
-                            readMenuFloatingBottomBar = update.value,
-                            readMenuBottomBarBlurMode = if (needsBlurFallback) ReadMenuBlurMode.Haze
-                            else it.menuConfig.readMenuBottomBarBlurMode,
-                        )
-                    )
-                }
-            }
-            is ConfigUpdate.ShowMenuIcon -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setShowMenuIcon(update.value)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(showMenuIcon = update.value)) }
-            }
-            is ConfigUpdate.MenuTopBarBlurMode -> {
-                val mode = update.value.coerceIn(0, 2).let {
-                    if (it == ReadMenuBlurMode.LiquidGlass) ReadMenuBlurMode.Haze else it
-                }
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuTopBarBlurMode(mode)
-                }
-                _uiState.update {
-                    it.copy(menuConfig = it.menuConfig.copy(readMenuTopBarBlurMode = mode))
-                }
-            }
-
-            is ConfigUpdate.MenuBottomBarBlurMode -> {
-                val mode = update.value.coerceIn(0, 2)
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuBottomBarBlurMode(mode)
-                }
-                _uiState.update {
-                    it.copy(menuConfig = it.menuConfig.copy(readMenuBottomBarBlurMode = mode))
-                }
-            }
-
-            is ConfigUpdate.MenuTopBarLiquidGlassButtons -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuTopBarLiquidGlassButtons(update.value)
-                }
-                _uiState.update {
-                    it.copy(menuConfig = it.menuConfig.copy(readMenuTopBarLiquidGlassButtons = update.value))
-                }
-            }
-
-            is ConfigUpdate.MenuTopBarTitleCapsule -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuTopBarTitleCapsule(update.value)
-                }
-                _uiState.update {
-                    it.copy(menuConfig = it.menuConfig.copy(readMenuTopBarTitleCapsule = update.value))
-                }
-            }
-
-            is ConfigUpdate.MenuBottomBarLiquidGlassButtons -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuBottomBarLiquidGlassButtons(update.value)
-                }
-                _uiState.update {
-                    it.copy(menuConfig = it.menuConfig.copy(readMenuBottomBarLiquidGlassButtons = update.value))
-                }
-            }
-
-            is ConfigUpdate.MenuFloatingIconLiquidGlass -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuFloatingIconLiquidGlass(update.value)
-                }
-                _uiState.update {
-                    it.copy(menuConfig = it.menuConfig.copy(readMenuFloatingIconLiquidGlass = update.value))
-                }
-            }
-
-            is ConfigUpdate.MenuTopBarBlurSelection -> {
-                val mode = update.mode.coerceIn(0, 2).let {
-                    if (it == ReadMenuBlurMode.LiquidGlass) ReadMenuBlurMode.Haze else it
-                }
-                val style = update.style.coerceIn(0, 1)
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuTopBarBlurMode(mode)
-                    readSettingsRepository.setReadMenuTopBarBlurStyle(style)
-                }
-                _uiState.update {
-                    it.copy(
-                        menuConfig = it.menuConfig.copy(
-                            readMenuTopBarBlurMode = mode,
-                            readMenuTopBarBlurStyle = style,
-                        )
-                    )
-                }
-            }
-
-            is ConfigUpdate.MenuBottomBarBlurStyle -> {
-                val style = update.value.coerceIn(0, 1)
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuBottomBarBlurStyle(style)
-                }
-                _uiState.update {
-                    it.copy(menuConfig = it.menuConfig.copy(readMenuBottomBarBlurStyle = style))
-                }
-            }
-            is ConfigUpdate.MenuBlurRadius -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuBlurRadius(update.value)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(readMenuBlurRadius = update.value)) }
-            }
-            is ConfigUpdate.MenuBlurAlpha -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuBlurAlpha(update.value)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(readMenuBlurAlpha = update.value)) }
-            }
-            is ConfigUpdate.MenuBlurColor -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuBlurColor(update.color)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(readMenuBlurColor = update.color)) }
-            }
-            is ConfigUpdate.MenuBlurColorNight -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuBlurColorNight(update.color)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(readMenuBlurColorNight = update.color)) }
-            }
-            is ConfigUpdate.MenuPaletteStyle -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuPaletteStyle(update.value)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(readMenuPaletteStyle = update.value)) }
-            }
-            is ConfigUpdate.MenuLensRadius -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuLensRadius(update.value)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(readMenuLensRadius = update.value)) }
-            }
-            is ConfigUpdate.MenuCustomIcon -> {
-                val icons = ReadBookConfig.readMenuCustomIcons.toMutableMap()
-                if (update.path.isBlank()) {
-                    icons.remove(update.id)?.let { path ->
-                        runCatching { java.io.File(path).delete() }
-                    }
-                } else {
-                    icons[update.id] = update.path
-                }
-                viewModelScope.launch {
-                    readSettingsRepository.setReadMenuCustomIcons(
-                        ReadBookConfig.encodeReadMenuCustomIcons(icons)
-                    )
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(readMenuCustomIcons = icons.toImmutableMap())) }
-            }
-            is ConfigUpdate.TitleBarCustomIcon -> {
-                val icons = ReadBookConfig.titleBarCustomIcons.toMutableMap()
-                if (update.path.isBlank()) {
-                    icons.remove(update.id)?.let { path ->
-                        runCatching { java.io.File(path).delete() }
-                    }
-                } else {
-                    icons[update.id] = update.path
-                }
-                viewModelScope.launch {
-                    readSettingsRepository.setTitleBarCustomIcons(
-                        ReadBookConfig.encodeReadMenuCustomIcons(icons)
-                    )
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(titleBarCustomIcons = icons.toImmutableMap())) }
-            }
-            is ConfigUpdate.TitleBarIconPosition -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setTitleBarIconPosition(update.value)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(titleBarIconPosition = update.value)) }
-            }
-            is ConfigUpdate.ShowTitleBarIcons -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setShowTitleBarIcons(update.value)
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(showTitleBarIcons = update.value)) }
-            }
-            is ConfigUpdate.TitleBarCompact -> {
-                viewModelScope.launch {
-                    readSettingsRepository.update { it.copy(titleBarCompact = update.value) }
-                }
-                _uiState.update { it.copy(menuConfig = it.menuConfig.copy(titleBarCompact = update.value)) }
-            }
-
-            // --- System UI (also persists to DataStore) ---
-            is ConfigUpdate.HideStatusBar -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setHideStatusBar(update.value)
-                }
-            }
-            is ConfigUpdate.HideNavigationBar -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setHideNavigationBar(update.value)
-                }
-            }
-
-            // --- Display toggles ---
-            is ConfigUpdate.PaddingDisplayCutouts -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setPaddingDisplayCutouts(update.value)
-                }
-            }
-            is ConfigUpdate.TitleBarMode -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setTitleBarMode(update.value)
-                }
-                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
-            }
-            is ConfigUpdate.ReadBodyToLh -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadBodyToLh(update.value)
-                }
-            }
-            is ConfigUpdate.DefaultSourceChangeAll -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setDefaultSourceChangeAll(update.value)
-                }
-            }
-            is ConfigUpdate.TextFullJustify -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setTextFullJustify(update.value)
-                }
-            }
-            is ConfigUpdate.TextBottomJustify -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setTextBottomJustify(update.value)
-                }
-            }
-            is ConfigUpdate.AdaptSpecialStyle -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setAdaptSpecialStyle(update.value)
-                }
-            }
-            is ConfigUpdate.UseZhLayout -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setUseZhLayout(update.value)
-                }
-            }
-            is ConfigUpdate.ShowBrightnessView -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setShowBrightnessView(update.value)
-                }
-                _uiState.update {
-                    it.copy(menuConfig = it.menuConfig.copy(showBrightnessView = update.value))
-                }
-                postEvent(PreferKey.showBrightnessView, "")
-            }
-
-            is ConfigUpdate.BrightnessVwPos -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setBrightnessVwPos(update.value)
-                }
-                _uiState.update {
-                    it.copy(menuConfig = it.menuConfig.copy(brightnessVwPos = update.value))
-                }
-            }
-
-            is ConfigUpdate.BrightnessAuto -> {
-                _uiState.update {
-                    it.copy(menuConfig = it.menuConfig.copy(brightnessAuto = update.value))
-                }
-                viewModelScope.launch {
-                    readSettingsRepository.setBrightnessAuto(update.value)
-                }
-                _effects.tryEmit(
-                    ReadBookEffect.ToggleBrightnessAuto(
-                        update.value,
-                        _uiState.value.menuConfig.readBrightness
-                    )
-                )
-            }
-            is ConfigUpdate.UseUnderlineGlobal -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setUseUnderline(update.value)
-                }
-            }
-            is ConfigUpdate.ReadSliderMode -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setReadSliderMode(update.value)
-                }
-                _uiState.update {
-                    it.copy(menuConfig = it.menuConfig.copy(readSliderMode = update.value))
-                }
-            }
-            is ConfigUpdate.DoubleHorizontalPage -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setDoubleHorizontalPage(update.value)
-                }
-            }
-            is ConfigUpdate.ProgressBarBehavior -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setProgressBarBehavior(update.value)
-                }
-            }
-            is ConfigUpdate.MouseWheelPage -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setMouseWheelPage(update.value)
-                }
-            }
-            is ConfigUpdate.VolumeKeyPage -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setVolumeKeyPage(update.value)
-                }
-            }
-            is ConfigUpdate.VolumeKeyPageOnPlay -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setVolumeKeyPageOnPlay(update.value)
-                }
-            }
-            is ConfigUpdate.KeyPageOnLongPress -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setKeyPageOnLongPress(update.value)
-                }
-            }
-            is ConfigUpdate.SliderVibrator -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setSliderVibrator(update.value)
-                }
-            }
-            is ConfigUpdate.SelectVibrator -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setSelectVibrator(update.value)
-                }
-            }
-            is ConfigUpdate.AutoChangeSource -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setAutoChangeSource(update.value)
-                }
-            }
-            is ConfigUpdate.AutoSuggestDayNight -> {
-                if (update.value) {
-                    hasDismissedDarkReminder = false
-                    hasDismissedLightReminder = false
-                }
-                viewModelScope.launch {
-                    readSettingsRepository.setAutoSuggestDayNight(update.value)
-                }
-            }
-            is ConfigUpdate.SelectText -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setSelectText(update.value)
-                }
-                _effects.tryEmit(ReadBookEffect.UpTextSelectAble(update.value))
-            }
-            is ConfigUpdate.NoAnimScrollPage -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setNoAnimScrollPage(update.value)
-                }
-                _effects.tryEmit(ReadBookEffect.UpPageAnim(upRecorder = false))
-            }
-            is ConfigUpdate.OptimizeRender -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setOptimizeRender(update.value)
-                }
-            }
-            is ConfigUpdate.ClickImgWay -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setClickImgWay(update.value)
-                }
-            }
-            is ConfigUpdate.DisableReturnKey -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setDisableReturnKey(update.value)
-                }
-            }
-            is ConfigUpdate.ExpandTextMenu -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setExpandTextMenu(update.value)
-                }
-            }
-            is ConfigUpdate.ShowSelectMenuIcon -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setShowSelectMenuIcon(update.value)
-                }
-            }
-            is ConfigUpdate.ShowReadTitleAddition -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setShowReadTitleAddition(update.value)
-                }
-                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
-            }
-
-            // --- Auto read ---
-            is ConfigUpdate.AutoReadSpeed -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setAutoReadSpeed(update.value)
-                }
-            }
-
-            // --- Chinese converter ---
-            is ConfigUpdate.ChineseConverterType -> {
-                viewModelScope.launch {
-                    readSettingsRepository.setChineseConverterType(update.value)
-                }
-            }
-        }
-
-        // 走了 gateway 的更新由 collectReadStyle 重建快照；只写 DataStore 的更新
-        // 不经 gateway，需在此手工重建——且必须两份一起，
-        // 否则像 ChineseConverterType 这种本就在 sheetConfig 里的项会一直显示旧值。
-        if (styleMutation == null) {
-            _uiState.update {
-                it.copy(
-                    styleConfig = buildStyleConfig(),
-                    sheetConfig = buildSheetConfig(),
-                )
-            }
-        }
-        if (update.actions.isNotEmpty()) {
-            _effects.tryEmit(ReadBookEffect.UpdateReadViewConfig(update.actions))
-        }
-    }
-
-    private fun ConfigUpdate.toReadStyleMutation(): ReadStyleMutation? = when (this) {
-        is ConfigUpdate.TextSize -> intMutation(ReadStyleIntKey.TextSize, value)
-        is ConfigUpdate.LetterSpacing -> floatMutation(ReadStyleFloatKey.LetterSpacing, value)
-        is ConfigUpdate.LineSpacing -> intMutation(ReadStyleIntKey.LineSpacing, value)
-        is ConfigUpdate.ParagraphSpacing -> intMutation(ReadStyleIntKey.ParagraphSpacing, value)
-        is ConfigUpdate.ParagraphIndent -> stringMutation(ReadStyleStringKey.ParagraphIndent, value)
-        is ConfigUpdate.TextItalic -> booleanMutation(ReadStyleBooleanKey.TextItalic, value)
-        is ConfigUpdate.TextBold -> intMutation(ReadStyleIntKey.TextBold, value)
-        is ConfigUpdate.TextColor -> colorMutation(ReadStyleColorKey.Text, color)
-        is ConfigUpdate.TextAccentColor -> colorMutation(ReadStyleColorKey.TextAccent, color)
-        is ConfigUpdate.TitleMode -> intMutation(ReadStyleIntKey.TitleMode, value)
-        is ConfigUpdate.TitleBold -> intMutation(ReadStyleIntKey.TitleBold, value)
-        is ConfigUpdate.TitleSegScaling -> floatMutation(ReadStyleFloatKey.TitleSegScaling, value)
-        is ConfigUpdate.TitleLineSpacingExtra ->
-            intMutation(ReadStyleIntKey.TitleLineSpacingExtra, value)
-        is ConfigUpdate.TitleLineSpacingSub ->
-            intMutation(ReadStyleIntKey.TitleLineSpacingSub, value)
-        is ConfigUpdate.TitleSize -> intMutation(ReadStyleIntKey.TitleSize, value)
-        is ConfigUpdate.TitleTopSpacing -> intMutation(ReadStyleIntKey.TitleTopSpacing, value)
-        is ConfigUpdate.TitleBottomSpacing ->
-            intMutation(ReadStyleIntKey.TitleBottomSpacing, value)
-        is ConfigUpdate.TitleColor -> colorMutation(ReadStyleColorKey.Title, color)
-        is ConfigUpdate.TitleColorNight -> colorMutation(ReadStyleColorKey.TitleNight, color)
-        is ConfigUpdate.TitleFont -> stringMutation(ReadStyleStringKey.TitleFont, path)
-        is ConfigUpdate.TitleSegType -> intMutation(ReadStyleIntKey.TitleSegType, value)
-        is ConfigUpdate.TitleSegDistance -> intMutation(ReadStyleIntKey.TitleSegDistance, value)
-        is ConfigUpdate.TitleSegFlag -> stringMutation(ReadStyleStringKey.TitleSegFlag, value)
-        is ConfigUpdate.HeaderMode -> intMutation(ReadStyleIntKey.HeaderMode, value)
-        is ConfigUpdate.FooterMode -> intMutation(ReadStyleIntKey.FooterMode, value)
-        is ConfigUpdate.TipHeaderLeft -> intMutation(ReadStyleIntKey.TipHeaderLeft, value)
-        is ConfigUpdate.TipHeaderMiddle -> intMutation(ReadStyleIntKey.TipHeaderMiddle, value)
-        is ConfigUpdate.TipHeaderRight -> intMutation(ReadStyleIntKey.TipHeaderRight, value)
-        is ConfigUpdate.TipFooterLeft -> intMutation(ReadStyleIntKey.TipFooterLeft, value)
-        is ConfigUpdate.TipFooterMiddle -> intMutation(ReadStyleIntKey.TipFooterMiddle, value)
-        is ConfigUpdate.TipFooterRight -> intMutation(ReadStyleIntKey.TipFooterRight, value)
-        is ConfigUpdate.HeaderFont -> stringMutation(ReadStyleStringKey.HeaderFont, path)
-        is ConfigUpdate.FooterFont -> stringMutation(ReadStyleStringKey.FooterFont, path)
-        is ConfigUpdate.CustomTipHeaderLeft ->
-            stringMutation(ReadStyleStringKey.CustomTipHeaderLeft, value)
-        is ConfigUpdate.CustomTipHeaderMiddle ->
-            stringMutation(ReadStyleStringKey.CustomTipHeaderMiddle, value)
-        is ConfigUpdate.CustomTipHeaderRight ->
-            stringMutation(ReadStyleStringKey.CustomTipHeaderRight, value)
-        is ConfigUpdate.CustomTipFooterLeft ->
-            stringMutation(ReadStyleStringKey.CustomTipFooterLeft, value)
-        is ConfigUpdate.CustomTipFooterMiddle ->
-            stringMutation(ReadStyleStringKey.CustomTipFooterMiddle, value)
-        is ConfigUpdate.CustomTipFooterRight ->
-            stringMutation(ReadStyleStringKey.CustomTipFooterRight, value)
-        is ConfigUpdate.HeaderFontSize -> intMutation(ReadStyleIntKey.HeaderFontSize, value)
-        is ConfigUpdate.FooterFontSize -> intMutation(ReadStyleIntKey.FooterFontSize, value)
-        is ConfigUpdate.ApplyHeaderStyle -> booleanMutation(ReadStyleBooleanKey.ApplyHeaderStyle, value)
-        is ConfigUpdate.TipHeaderColor -> colorMutation(ReadStyleColorKey.TipHeader, color)
-        is ConfigUpdate.TipHeaderColorNight ->
-            colorMutation(ReadStyleColorKey.TipHeaderNight, color)
-        is ConfigUpdate.TipFooterColor -> colorMutation(ReadStyleColorKey.TipFooter, color)
-        is ConfigUpdate.TipFooterColorNight ->
-            colorMutation(ReadStyleColorKey.TipFooterNight, color)
-        is ConfigUpdate.TipDividerColor -> colorMutation(ReadStyleColorKey.TipDivider, color)
-        is ConfigUpdate.PageAnim -> intMutation(ReadStyleIntKey.PageAnim, value)
-        is ConfigUpdate.TextShadow -> booleanMutation(ReadStyleBooleanKey.TextShadow, value)
-        is ConfigUpdate.ShadowRadius -> floatMutation(ReadStyleFloatKey.ShadowRadius, value)
-        is ConfigUpdate.ShadowDx -> floatMutation(ReadStyleFloatKey.ShadowDx, value)
-        is ConfigUpdate.ShadowDy -> floatMutation(ReadStyleFloatKey.ShadowDy, value)
-        is ConfigUpdate.ShadowColor -> colorMutation(ReadStyleColorKey.Shadow, color)
-        is ConfigUpdate.Underline -> booleanMutation(ReadStyleBooleanKey.Underline, value)
-        is ConfigUpdate.DottedLine -> booleanMutation(ReadStyleBooleanKey.DottedLine, value)
-        is ConfigUpdate.UnderlineExtend ->
-            booleanMutation(ReadStyleBooleanKey.UnderlineExtend, value)
-        is ConfigUpdate.UnderlineHeight -> intMutation(ReadStyleIntKey.UnderlineHeight, value)
-        is ConfigUpdate.UnderlinePadding -> intMutation(ReadStyleIntKey.UnderlinePadding, value)
-        is ConfigUpdate.DottedBase -> floatMutation(ReadStyleFloatKey.DottedBase, value)
-        is ConfigUpdate.DottedRatio -> floatMutation(ReadStyleFloatKey.DottedRatio, value)
-        is ConfigUpdate.UnderlineColor -> colorMutation(ReadStyleColorKey.Underline, color)
-        is ConfigUpdate.PaddingTop -> intMutation(ReadStyleIntKey.PaddingTop, value)
-        is ConfigUpdate.PaddingBottom -> intMutation(ReadStyleIntKey.PaddingBottom, value)
-        is ConfigUpdate.PaddingLeft -> intMutation(ReadStyleIntKey.PaddingLeft, value)
-        is ConfigUpdate.PaddingRight -> intMutation(ReadStyleIntKey.PaddingRight, value)
-        is ConfigUpdate.HeaderPaddingTop -> intMutation(ReadStyleIntKey.HeaderPaddingTop, value)
-        is ConfigUpdate.HeaderPaddingBottom ->
-            intMutation(ReadStyleIntKey.HeaderPaddingBottom, value)
-        is ConfigUpdate.HeaderPaddingLeft -> intMutation(ReadStyleIntKey.HeaderPaddingLeft, value)
-        is ConfigUpdate.HeaderPaddingRight ->
-            intMutation(ReadStyleIntKey.HeaderPaddingRight, value)
-        is ConfigUpdate.ShowHeaderLine ->
-            booleanMutation(ReadStyleBooleanKey.ShowHeaderLine, value)
-        is ConfigUpdate.FooterPaddingTop -> intMutation(ReadStyleIntKey.FooterPaddingTop, value)
-        is ConfigUpdate.FooterPaddingBottom ->
-            intMutation(ReadStyleIntKey.FooterPaddingBottom, value)
-        is ConfigUpdate.FooterPaddingLeft -> intMutation(ReadStyleIntKey.FooterPaddingLeft, value)
-        is ConfigUpdate.FooterPaddingRight ->
-            intMutation(ReadStyleIntKey.FooterPaddingRight, value)
-        is ConfigUpdate.ShowFooterLine ->
-            booleanMutation(ReadStyleBooleanKey.ShowFooterLine, value)
-        is ConfigUpdate.BgStr -> stringMutation(ReadStyleStringKey.BgStr, value)
-        is ConfigUpdate.BgStrNight -> stringMutation(ReadStyleStringKey.BgStrNight, value)
-        is ConfigUpdate.BgStrEInk -> stringMutation(ReadStyleStringKey.BgStrEInk, value)
-        is ConfigUpdate.BgType -> intMutation(ReadStyleIntKey.BgType, value)
-        is ConfigUpdate.BgTypeNight -> intMutation(ReadStyleIntKey.BgTypeNight, value)
-        is ConfigUpdate.BgTypeEInk -> intMutation(ReadStyleIntKey.BgTypeEInk, value)
-        is ConfigUpdate.BgAlpha -> intMutation(ReadStyleIntKey.BgAlpha, value)
-        is ConfigUpdate.StatusIconDark ->
-            booleanMutation(ReadStyleBooleanKey.StatusIconDark, value)
-        is ConfigUpdate.StyleName -> stringMutation(ReadStyleStringKey.StyleName, value)
-        else -> null
-    }
-
-    private fun intMutation(key: ReadStyleIntKey, value: Int) =
-        ReadStyleMutation.IntValue(key, value)
-
-    private fun floatMutation(key: ReadStyleFloatKey, value: Float) =
-        ReadStyleMutation.FloatValue(key, value)
-
-    private fun booleanMutation(key: ReadStyleBooleanKey, value: Boolean) =
-        ReadStyleMutation.BooleanValue(key, value)
-
-    private fun stringMutation(key: ReadStyleStringKey, value: String) =
-        ReadStyleMutation.StringValue(key, value)
-
-    private fun colorMutation(key: ReadStyleColorKey, value: Int) =
-        ReadStyleMutation.ColorValue(key, value)
-
     private fun saveMenuCustomIcon(id: String, uri: Uri) {
         execute {
             val iconFile = java.io.File(context.filesDir, "read_menu_icons/$id.png")
@@ -4310,7 +3547,7 @@ class ReadBookViewModel(
             context.contentResolver.openInputStream(uri)?.use { input ->
                 iconFile.outputStream().use { output -> input.copyTo(output) }
             }
-            handleConfigUpdate(ConfigUpdate.MenuCustomIcon(id, iconFile.absolutePath))
+            configUpdateDelegate.handle(ConfigUpdate.MenuCustomIcon(id, iconFile.absolutePath))
         }
     }
 
@@ -4321,7 +3558,7 @@ class ReadBookViewModel(
             context.contentResolver.openInputStream(uri)?.use { input ->
                 iconFile.outputStream().use { output -> input.copyTo(output) }
             }
-            handleConfigUpdate(ConfigUpdate.TitleBarCustomIcon(id, iconFile.absolutePath))
+            configUpdateDelegate.handle(ConfigUpdate.TitleBarCustomIcon(id, iconFile.absolutePath))
         }
     }
 

app/src/main/java/io/legado/app/ui/book/read/ReadConfigUpdateDelegate.kt

@@ -0,0 +1,842 @@
+package io.legado.app.ui.book.read
+
+import io.legado.app.constant.EventBus
+import io.legado.app.constant.PreferKey
+import io.legado.app.constant.ReadMenuBlurMode
+import io.legado.app.domain.gateway.ReadStyleGateway
+import io.legado.app.data.repository.ReadSettingsRepository
+import io.legado.app.domain.gateway.ReadStyleBooleanKey
+import io.legado.app.domain.gateway.ReadStyleColorKey
+import io.legado.app.domain.gateway.ReadStyleFloatKey
+import io.legado.app.domain.gateway.ReadStyleIntKey
+import io.legado.app.domain.gateway.ReadStyleMutation
+import io.legado.app.domain.gateway.ReadStyleStringKey
+import io.legado.app.help.config.ReadBookConfig
+import io.legado.app.model.ReadSessionState
+import io.legado.app.utils.postEvent
+import kotlinx.collections.immutable.toImmutableMap
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
+
+/**
+ * 阅读页配置更新的分发器：把一条 [ConfigUpdate] 落到对应的 repository，并发出相应 effect。
+ *
+ * **无自持状态**——和 AI/高亮/正文编辑三个域不同，这里没有属于自己的 UiState。
+ * 它写的 `menuConfig` 是阅读器 chrome 的状态，被菜单栏读，所以留在 [ReadBookUiState]，
+ * 经 [Host.updateMenuConfig] 回写。摘出来的收益是 780 行离开 god object、
+ * 158 分支的配置分发变成可独立审阅的一块。
+ *
+ * 纯排版项由 [toReadStyleMutation] 转成 [ReadStyleMutation] 交给 repository；
+ * 转不出 mutation 的（只写 DataStore 的项）走 [Host.refreshConfigSnapshots] ——
+ * 这是排版快照三条重建通道里的第三条，删之前先看 `collectReadStyle` 上的注释。
+ */
+class ReadConfigUpdateDelegate(
+    private val scope: CoroutineScope,
+    private val host: Host,
+    private val readSettingsRepository: ReadSettingsRepository,
+    private val readBookStyleConfigRepository: ReadStyleGateway,
+) {
+
+    interface Host {
+        /** 当前菜单配置快照，个别分支要读旧值做回退判断。 */
+        val menuConfig: ReadMenuConfig
+
+        fun updateMenuConfig(transform: (ReadMenuConfig) -> ReadMenuConfig)
+
+        /** 重建 styleConfig + sheetConfig 两份快照（只写 DataStore 的配置项走这条）。 */
+        fun refreshConfigSnapshots()
+
+        fun emitEffect(effect: ReadBookEffect)
+
+        /** 重新打开「自动建议日夜」时，清掉本次会话已忽略提醒的标记。 */
+        fun resetDayNightReminderDismissal()
+    }
+
+    fun handle(update: ConfigUpdate) {
+        val styleMutation = update.toReadStyleMutation()
+        styleMutation?.let(readBookStyleConfigRepository::updateCurrentStyle)
+        when (update) {
+            // --- Text style ---
+            is ConfigUpdate.TextSize,
+            is ConfigUpdate.LetterSpacing,
+            is ConfigUpdate.LineSpacing,
+            is ConfigUpdate.ParagraphSpacing,
+            is ConfigUpdate.ParagraphIndent,
+            is ConfigUpdate.TextItalic,
+            is ConfigUpdate.TextBold,
+            is ConfigUpdate.TextColor,
+            is ConfigUpdate.TextAccentColor -> Unit
+
+            // --- Title style ---
+            is ConfigUpdate.TitleMode,
+            is ConfigUpdate.TitleBold,
+            is ConfigUpdate.TitleSegScaling,
+            is ConfigUpdate.TitleLineSpacingExtra,
+            is ConfigUpdate.TitleLineSpacingSub,
+            is ConfigUpdate.TitleSize,
+            is ConfigUpdate.TitleTopSpacing,
+            is ConfigUpdate.TitleBottomSpacing,
+            is ConfigUpdate.TitleColor,
+            is ConfigUpdate.TitleColorNight,
+            is ConfigUpdate.TitleFont,
+            is ConfigUpdate.TitleSegType,
+            is ConfigUpdate.TitleSegDistance,
+            is ConfigUpdate.TitleSegFlag -> Unit
+
+            // --- Header / footer tips ---
+            is ConfigUpdate.HeaderMode,
+            is ConfigUpdate.FooterMode,
+            is ConfigUpdate.TipHeaderLeft,
+            is ConfigUpdate.TipHeaderMiddle,
+            is ConfigUpdate.TipHeaderRight,
+            is ConfigUpdate.TipFooterLeft,
+            is ConfigUpdate.TipFooterMiddle,
+            is ConfigUpdate.TipFooterRight,
+            is ConfigUpdate.CustomTipHeaderLeft,
+            is ConfigUpdate.CustomTipHeaderMiddle,
+            is ConfigUpdate.CustomTipHeaderRight,
+            is ConfigUpdate.CustomTipFooterLeft,
+            is ConfigUpdate.CustomTipFooterMiddle,
+            is ConfigUpdate.CustomTipFooterRight,
+            is ConfigUpdate.HeaderFont,
+            is ConfigUpdate.HeaderFontSize,
+            is ConfigUpdate.FooterFont,
+            is ConfigUpdate.FooterFontSize,
+            is ConfigUpdate.ApplyHeaderStyle,
+            is ConfigUpdate.TipHeaderColor,
+            is ConfigUpdate.TipHeaderColorNight,
+            is ConfigUpdate.TipFooterColor,
+            is ConfigUpdate.TipFooterColorNight,
+            is ConfigUpdate.TipDividerColor -> Unit
+
+            // --- Layout / style ---
+            is ConfigUpdate.StyleSelect -> {
+                scope.launch {
+                    readSettingsRepository.setStyleSelect(ReadSessionState.isComic, update.index)
+                }
+            }
+            is ConfigUpdate.ShareLayout -> {
+                scope.launch {
+                    readSettingsRepository.setShareLayout(update.value)
+                }
+            }
+            is ConfigUpdate.PageAnim -> Unit
+
+            // --- Menu appearance ---
+            is ConfigUpdate.MenuBgColor -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuBgColor(update.color)
+                }
+                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
+            }
+            is ConfigUpdate.MenuAccentColor -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuAccentColor(update.color)
+                }
+                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
+            }
+            is ConfigUpdate.MenuContainerColor -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuContainerColor(update.color)
+                }
+                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
+            }
+            is ConfigUpdate.MenuBgColorNight -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuBgColorNight(update.color)
+                }
+                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
+            }
+            is ConfigUpdate.MenuAccentColorNight -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuAccentColorNight(update.color)
+                }
+                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
+            }
+            is ConfigUpdate.MenuContainerColorNight -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuContainerColorNight(update.color)
+                }
+                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
+            }
+            is ConfigUpdate.MenuTextColor -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuTextColor(update.color)
+                }
+                host.updateMenuConfig {
+                    it.copy(readMenuTextColor = update.color)
+                }
+            }
+            is ConfigUpdate.MenuTextColorNight -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuTextColorNight(update.color)
+                }
+                host.updateMenuConfig {
+                    it.copy(readMenuTextColorNight = update.color)
+                }
+            }
+            is ConfigUpdate.MenuColorMode -> {
+                val value = update.value.coerceIn(0, 1)
+                scope.launch {
+                    readSettingsRepository.setReadMenuColorMode(value)
+                }
+                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
+            }
+            is ConfigUpdate.ReadBarStyle -> {
+                val value = update.value.coerceIn(0, 2)
+                scope.launch {
+                    readSettingsRepository.setReadBarStyle(value)
+                }
+                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
+            }
+
+            // --- Menu bar border ---
+            is ConfigUpdate.BorderWidth -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuBorderWidth(update.value)
+                }
+                host.updateMenuConfig { it.copy(readMenuBorderWidth = update.value) }
+            }
+            is ConfigUpdate.BorderColor -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuBorderColor(update.color)
+                }
+                host.updateMenuConfig { it.copy(readMenuBorderColor = update.color) }
+            }
+            is ConfigUpdate.BorderColorNight -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuBorderColorNight(update.color)
+                }
+                host.updateMenuConfig { it.copy(readMenuBorderColorNight = update.color) }
+            }
+
+            // --- Shadow ---
+            is ConfigUpdate.TextShadow,
+            is ConfigUpdate.ShadowRadius,
+            is ConfigUpdate.ShadowDx,
+            is ConfigUpdate.ShadowDy,
+            is ConfigUpdate.ShadowColor -> Unit
+
+            // --- Underline ---
+            is ConfigUpdate.Underline,
+            is ConfigUpdate.DottedLine,
+            is ConfigUpdate.UnderlineExtend,
+            is ConfigUpdate.UnderlineHeight,
+            is ConfigUpdate.UnderlinePadding,
+            is ConfigUpdate.DottedBase,
+            is ConfigUpdate.DottedRatio,
+            is ConfigUpdate.UnderlineColor -> Unit
+
+            // --- Body padding ---
+            is ConfigUpdate.PaddingTop,
+            is ConfigUpdate.PaddingBottom,
+            is ConfigUpdate.PaddingLeft,
+            is ConfigUpdate.PaddingRight -> Unit
+
+            // --- Header padding ---
+            is ConfigUpdate.HeaderPaddingTop,
+            is ConfigUpdate.HeaderPaddingBottom,
+            is ConfigUpdate.HeaderPaddingLeft,
+            is ConfigUpdate.HeaderPaddingRight,
+            is ConfigUpdate.ShowHeaderLine -> Unit
+
+            // --- Footer padding ---
+            is ConfigUpdate.FooterPaddingTop,
+            is ConfigUpdate.FooterPaddingBottom,
+            is ConfigUpdate.FooterPaddingLeft,
+            is ConfigUpdate.FooterPaddingRight,
+            is ConfigUpdate.ShowFooterLine -> Unit
+
+            // --- Background / display ---
+            is ConfigUpdate.BgStr,
+            is ConfigUpdate.BgStrNight,
+            is ConfigUpdate.BgStrEInk,
+            is ConfigUpdate.BgType,
+            is ConfigUpdate.BgTypeNight,
+            is ConfigUpdate.BgTypeEInk,
+            is ConfigUpdate.BgAlpha,
+            is ConfigUpdate.StatusIconDark,
+            is ConfigUpdate.StyleName -> Unit
+            is ConfigUpdate.MenuIconShowText -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuIconShowText(update.value)
+                }
+                host.updateMenuConfig { it.copy(readMenuIconShowText = update.value) }
+            }
+            is ConfigUpdate.MenuIconStyle -> {
+                val value = update.value.coerceIn(0, 2)
+                scope.launch {
+                    readSettingsRepository.setReadMenuIconStyle(value)
+                }
+                host.updateMenuConfig { it.copy(readMenuIconStyle = value) }
+            }
+            is ConfigUpdate.TitleBarIconStyle -> {
+                val value = update.value.coerceIn(0, 2)
+                scope.launch {
+                    readSettingsRepository.setTitleBarIconStyle(value)
+                }
+                host.updateMenuConfig { it.copy(titleBarIconStyle = value) }
+            }
+            is ConfigUpdate.MenuIconItemsPerRow -> {
+                val value = update.value.coerceIn(2, 8)
+                scope.launch {
+                    readSettingsRepository.setReadMenuIconItemsPerRow(value)
+                }
+                host.updateMenuConfig { it.copy(readMenuIconItemsPerRow = value) }
+            }
+            is ConfigUpdate.MenuIconRowCount -> {
+                val value = update.value.coerceIn(1, 2)
+                scope.launch {
+                    readSettingsRepository.setReadMenuIconRowCount(value)
+                }
+                host.updateMenuConfig { it.copy(readMenuIconRowCount = value) }
+            }
+            is ConfigUpdate.MenuBottomCornerRadius -> {
+                val value = update.value.coerceIn(0, 32)
+                scope.launch {
+                    readSettingsRepository.setReadMenuBottomCornerRadius(value)
+                }
+                host.updateMenuConfig { it.copy(readMenuBottomCornerRadius = value) }
+            }
+            is ConfigUpdate.FloatingBottomBar -> {
+                val needsBlurFallback = !update.value &&
+                        host.menuConfig.readMenuBottomBarBlurMode ==
+                        ReadMenuBlurMode.LiquidGlass
+                scope.launch {
+                    readSettingsRepository.setReadMenuFloatingBottomBar(update.value)
+                    if (needsBlurFallback) {
+                        readSettingsRepository.setReadMenuBottomBarBlurMode(ReadMenuBlurMode.Haze)
+                    }
+                }
+                host.updateMenuConfig {
+                    it.copy(
+                        readMenuFloatingBottomBar = update.value,
+                        readMenuBottomBarBlurMode = if (needsBlurFallback) ReadMenuBlurMode.Haze
+                        else it.readMenuBottomBarBlurMode,
+                    )
+                }
+            }
+            is ConfigUpdate.ShowMenuIcon -> {
+                scope.launch {
+                    readSettingsRepository.setShowMenuIcon(update.value)
+                }
+                host.updateMenuConfig { it.copy(showMenuIcon = update.value) }
+            }
+            is ConfigUpdate.MenuTopBarBlurMode -> {
+                val mode = update.value.coerceIn(0, 2).let {
+                    if (it == ReadMenuBlurMode.LiquidGlass) ReadMenuBlurMode.Haze else it
+                }
+                scope.launch {
+                    readSettingsRepository.setReadMenuTopBarBlurMode(mode)
+                }
+                host.updateMenuConfig {
+                    it.copy(readMenuTopBarBlurMode = mode)
+                }
+            }
+
+            is ConfigUpdate.MenuBottomBarBlurMode -> {
+                val mode = update.value.coerceIn(0, 2)
+                scope.launch {
+                    readSettingsRepository.setReadMenuBottomBarBlurMode(mode)
+                }
+                host.updateMenuConfig {
+                    it.copy(readMenuBottomBarBlurMode = mode)
+                }
+            }
+
+            is ConfigUpdate.MenuTopBarLiquidGlassButtons -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuTopBarLiquidGlassButtons(update.value)
+                }
+                host.updateMenuConfig {
+                    it.copy(readMenuTopBarLiquidGlassButtons = update.value)
+                }
+            }
+
+            is ConfigUpdate.MenuTopBarTitleCapsule -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuTopBarTitleCapsule(update.value)
+                }
+                host.updateMenuConfig {
+                    it.copy(readMenuTopBarTitleCapsule = update.value)
+                }
+            }
+
+            is ConfigUpdate.MenuBottomBarLiquidGlassButtons -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuBottomBarLiquidGlassButtons(update.value)
+                }
+                host.updateMenuConfig {
+                    it.copy(readMenuBottomBarLiquidGlassButtons = update.value)
+                }
+            }
+
+            is ConfigUpdate.MenuFloatingIconLiquidGlass -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuFloatingIconLiquidGlass(update.value)
+                }
+                host.updateMenuConfig {
+                    it.copy(readMenuFloatingIconLiquidGlass = update.value)
+                }
+            }
+
+            is ConfigUpdate.MenuTopBarBlurSelection -> {
+                val mode = update.mode.coerceIn(0, 2).let {
+                    if (it == ReadMenuBlurMode.LiquidGlass) ReadMenuBlurMode.Haze else it
+                }
+                val style = update.style.coerceIn(0, 1)
+                scope.launch {
+                    readSettingsRepository.setReadMenuTopBarBlurMode(mode)
+                    readSettingsRepository.setReadMenuTopBarBlurStyle(style)
+                }
+                host.updateMenuConfig {
+                    it.copy(
+                        readMenuTopBarBlurMode = mode,
+                        readMenuTopBarBlurStyle = style,
+                    )
+                }
+            }
+
+            is ConfigUpdate.MenuBottomBarBlurStyle -> {
+                val style = update.value.coerceIn(0, 1)
+                scope.launch {
+                    readSettingsRepository.setReadMenuBottomBarBlurStyle(style)
+                }
+                host.updateMenuConfig {
+                    it.copy(readMenuBottomBarBlurStyle = style)
+                }
+            }
+            is ConfigUpdate.MenuBlurRadius -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuBlurRadius(update.value)
+                }
+                host.updateMenuConfig { it.copy(readMenuBlurRadius = update.value) }
+            }
+            is ConfigUpdate.MenuBlurAlpha -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuBlurAlpha(update.value)
+                }
+                host.updateMenuConfig { it.copy(readMenuBlurAlpha = update.value) }
+            }
+            is ConfigUpdate.MenuBlurColor -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuBlurColor(update.color)
+                }
+                host.updateMenuConfig { it.copy(readMenuBlurColor = update.color) }
+            }
+            is ConfigUpdate.MenuBlurColorNight -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuBlurColorNight(update.color)
+                }
+                host.updateMenuConfig { it.copy(readMenuBlurColorNight = update.color) }
+            }
+            is ConfigUpdate.MenuPaletteStyle -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuPaletteStyle(update.value)
+                }
+                host.updateMenuConfig { it.copy(readMenuPaletteStyle = update.value) }
+            }
+            is ConfigUpdate.MenuLensRadius -> {
+                scope.launch {
+                    readSettingsRepository.setReadMenuLensRadius(update.value)
+                }
+                host.updateMenuConfig { it.copy(readMenuLensRadius = update.value) }
+            }
+            is ConfigUpdate.MenuCustomIcon -> {
+                val icons = ReadBookConfig.readMenuCustomIcons.toMutableMap()
+                if (update.path.isBlank()) {
+                    icons.remove(update.id)?.let { path ->
+                        runCatching { java.io.File(path).delete() }
+                    }
+                } else {
+                    icons[update.id] = update.path
+                }
+                scope.launch {
+                    readSettingsRepository.setReadMenuCustomIcons(
+                        ReadBookConfig.encodeReadMenuCustomIcons(icons)
+                    )
+                }
+                host.updateMenuConfig { it.copy(readMenuCustomIcons = icons.toImmutableMap()) }
+            }
+            is ConfigUpdate.TitleBarCustomIcon -> {
+                val icons = ReadBookConfig.titleBarCustomIcons.toMutableMap()
+                if (update.path.isBlank()) {
+                    icons.remove(update.id)?.let { path ->
+                        runCatching { java.io.File(path).delete() }
+                    }
+                } else {
+                    icons[update.id] = update.path
+                }
+                scope.launch {
+                    readSettingsRepository.setTitleBarCustomIcons(
+                        ReadBookConfig.encodeReadMenuCustomIcons(icons)
+                    )
+                }
+                host.updateMenuConfig { it.copy(titleBarCustomIcons = icons.toImmutableMap()) }
+            }
+            is ConfigUpdate.TitleBarIconPosition -> {
+                scope.launch {
+                    readSettingsRepository.setTitleBarIconPosition(update.value)
+                }
+                host.updateMenuConfig { it.copy(titleBarIconPosition = update.value) }
+            }
+            is ConfigUpdate.ShowTitleBarIcons -> {
+                scope.launch {
+                    readSettingsRepository.setShowTitleBarIcons(update.value)
+                }
+                host.updateMenuConfig { it.copy(showTitleBarIcons = update.value) }
+            }
+            is ConfigUpdate.TitleBarCompact -> {
+                scope.launch {
+                    readSettingsRepository.update { it.copy(titleBarCompact = update.value) }
+                }
+                host.updateMenuConfig { it.copy(titleBarCompact = update.value) }
+            }
+
+            // --- System UI (also persists to DataStore) ---
+            is ConfigUpdate.HideStatusBar -> {
+                scope.launch {
+                    readSettingsRepository.setHideStatusBar(update.value)
+                }
+            }
+            is ConfigUpdate.HideNavigationBar -> {
+                scope.launch {
+                    readSettingsRepository.setHideNavigationBar(update.value)
+                }
+            }
+
+            // --- Display toggles ---
+            is ConfigUpdate.PaddingDisplayCutouts -> {
+                scope.launch {
+                    readSettingsRepository.setPaddingDisplayCutouts(update.value)
+                }
+            }
+            is ConfigUpdate.TitleBarMode -> {
+                scope.launch {
+                    readSettingsRepository.setTitleBarMode(update.value)
+                }
+                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
+            }
+            is ConfigUpdate.ReadBodyToLh -> {
+                scope.launch {
+                    readSettingsRepository.setReadBodyToLh(update.value)
+                }
+            }
+            is ConfigUpdate.DefaultSourceChangeAll -> {
+                scope.launch {
+                    readSettingsRepository.setDefaultSourceChangeAll(update.value)
+                }
+            }
+            is ConfigUpdate.TextFullJustify -> {
+                scope.launch {
+                    readSettingsRepository.setTextFullJustify(update.value)
+                }
+            }
+            is ConfigUpdate.TextBottomJustify -> {
+                scope.launch {
+                    readSettingsRepository.setTextBottomJustify(update.value)
+                }
+            }
+            is ConfigUpdate.AdaptSpecialStyle -> {
+                scope.launch {
+                    readSettingsRepository.setAdaptSpecialStyle(update.value)
+                }
+            }
+            is ConfigUpdate.UseZhLayout -> {
+                scope.launch {
+                    readSettingsRepository.setUseZhLayout(update.value)
+                }
+            }
+            is ConfigUpdate.ShowBrightnessView -> {
+                scope.launch {
+                    readSettingsRepository.setShowBrightnessView(update.value)
+                }
+                host.updateMenuConfig {
+                    it.copy(showBrightnessView = update.value)
+                }
+                postEvent(PreferKey.showBrightnessView, "")
+            }
+
+            is ConfigUpdate.BrightnessVwPos -> {
+                scope.launch {
+                    readSettingsRepository.setBrightnessVwPos(update.value)
+                }
+                host.updateMenuConfig {
+                    it.copy(brightnessVwPos = update.value)
+                }
+            }
+
+            is ConfigUpdate.BrightnessAuto -> {
+                host.updateMenuConfig {
+                    it.copy(brightnessAuto = update.value)
+                }
+                scope.launch {
+                    readSettingsRepository.setBrightnessAuto(update.value)
+                }
+                host.emitEffect(
+                    ReadBookEffect.ToggleBrightnessAuto(
+                        update.value,
+                        host.menuConfig.readBrightness
+                    )
+                )
+            }
+            is ConfigUpdate.UseUnderlineGlobal -> {
+                scope.launch {
+                    readSettingsRepository.setUseUnderline(update.value)
+                }
+            }
+            is ConfigUpdate.ReadSliderMode -> {
+                scope.launch {
+                    readSettingsRepository.setReadSliderMode(update.value)
+                }
+                host.updateMenuConfig {
+                    it.copy(readSliderMode = update.value)
+                }
+            }
+            is ConfigUpdate.DoubleHorizontalPage -> {
+                scope.launch {
+                    readSettingsRepository.setDoubleHorizontalPage(update.value)
+                }
+            }
+            is ConfigUpdate.ProgressBarBehavior -> {
+                scope.launch {
+                    readSettingsRepository.setProgressBarBehavior(update.value)
+                }
+            }
+            is ConfigUpdate.MouseWheelPage -> {
+                scope.launch {
+                    readSettingsRepository.setMouseWheelPage(update.value)
+                }
+            }
+            is ConfigUpdate.VolumeKeyPage -> {
+                scope.launch {
+                    readSettingsRepository.setVolumeKeyPage(update.value)
+                }
+            }
+            is ConfigUpdate.VolumeKeyPageOnPlay -> {
+                scope.launch {
+                    readSettingsRepository.setVolumeKeyPageOnPlay(update.value)
+                }
+            }
+            is ConfigUpdate.KeyPageOnLongPress -> {
+                scope.launch {
+                    readSettingsRepository.setKeyPageOnLongPress(update.value)
+                }
+            }
+            is ConfigUpdate.SliderVibrator -> {
+                scope.launch {
+                    readSettingsRepository.setSliderVibrator(update.value)
+                }
+            }
+            is ConfigUpdate.SelectVibrator -> {
+                scope.launch {
+                    readSettingsRepository.setSelectVibrator(update.value)
+                }
+            }
+            is ConfigUpdate.AutoChangeSource -> {
+                scope.launch {
+                    readSettingsRepository.setAutoChangeSource(update.value)
+                }
+            }
+            is ConfigUpdate.AutoSuggestDayNight -> {
+                if (update.value) {
+                    host.resetDayNightReminderDismissal()
+                }
+                scope.launch {
+                    readSettingsRepository.setAutoSuggestDayNight(update.value)
+                }
+            }
+            is ConfigUpdate.SelectText -> {
+                scope.launch {
+                    readSettingsRepository.setSelectText(update.value)
+                }
+                host.emitEffect(ReadBookEffect.UpTextSelectAble(update.value))
+            }
+            is ConfigUpdate.NoAnimScrollPage -> {
+                scope.launch {
+                    readSettingsRepository.setNoAnimScrollPage(update.value)
+                }
+                host.emitEffect(ReadBookEffect.UpPageAnim(upRecorder = false))
+            }
+            is ConfigUpdate.OptimizeRender -> {
+                scope.launch {
+                    readSettingsRepository.setOptimizeRender(update.value)
+                }
+            }
+            is ConfigUpdate.ClickImgWay -> {
+                scope.launch {
+                    readSettingsRepository.setClickImgWay(update.value)
+                }
+            }
+            is ConfigUpdate.DisableReturnKey -> {
+                scope.launch {
+                    readSettingsRepository.setDisableReturnKey(update.value)
+                }
+            }
+            is ConfigUpdate.ExpandTextMenu -> {
+                scope.launch {
+                    readSettingsRepository.setExpandTextMenu(update.value)
+                }
+            }
+            is ConfigUpdate.ShowSelectMenuIcon -> {
+                scope.launch {
+                    readSettingsRepository.setShowSelectMenuIcon(update.value)
+                }
+            }
+            is ConfigUpdate.ShowReadTitleAddition -> {
+                scope.launch {
+                    readSettingsRepository.setShowReadTitleAddition(update.value)
+                }
+                postEvent(EventBus.UPDATE_READ_ACTION_BAR, true)
+            }
+
+            // --- Auto read ---
+            is ConfigUpdate.AutoReadSpeed -> {
+                scope.launch {
+                    readSettingsRepository.setAutoReadSpeed(update.value)
+                }
+            }
+
+            // --- Chinese converter ---
+            is ConfigUpdate.ChineseConverterType -> {
+                scope.launch {
+                    readSettingsRepository.setChineseConverterType(update.value)
+                }
+            }
+        }
+
+        // 走了 gateway 的更新由 collectReadStyle 重建快照；只写 DataStore 的更新
+        // 不经 gateway，需在此手工重建——且必须两份一起，
+        // 否则像 ChineseConverterType 这种本就在 sheetConfig 里的项会一直显示旧值。
+        if (styleMutation == null) {
+            host.refreshConfigSnapshots()
+        }
+        if (update.actions.isNotEmpty()) {
+            host.emitEffect(ReadBookEffect.UpdateReadViewConfig(update.actions))
+        }
+    }
+
+    private fun ConfigUpdate.toReadStyleMutation(): ReadStyleMutation? = when (this) {
+        is ConfigUpdate.TextSize -> intMutation(ReadStyleIntKey.TextSize, value)
+        is ConfigUpdate.LetterSpacing -> floatMutation(ReadStyleFloatKey.LetterSpacing, value)
+        is ConfigUpdate.LineSpacing -> intMutation(ReadStyleIntKey.LineSpacing, value)
+        is ConfigUpdate.ParagraphSpacing -> intMutation(ReadStyleIntKey.ParagraphSpacing, value)
+        is ConfigUpdate.ParagraphIndent -> stringMutation(ReadStyleStringKey.ParagraphIndent, value)
+        is ConfigUpdate.TextItalic -> booleanMutation(ReadStyleBooleanKey.TextItalic, value)
+        is ConfigUpdate.TextBold -> intMutation(ReadStyleIntKey.TextBold, value)
+        is ConfigUpdate.TextColor -> colorMutation(ReadStyleColorKey.Text, color)
+        is ConfigUpdate.TextAccentColor -> colorMutation(ReadStyleColorKey.TextAccent, color)
+        is ConfigUpdate.TitleMode -> intMutation(ReadStyleIntKey.TitleMode, value)
+        is ConfigUpdate.TitleBold -> intMutation(ReadStyleIntKey.TitleBold, value)
+        is ConfigUpdate.TitleSegScaling -> floatMutation(ReadStyleFloatKey.TitleSegScaling, value)
+        is ConfigUpdate.TitleLineSpacingExtra ->
+            intMutation(ReadStyleIntKey.TitleLineSpacingExtra, value)
+        is ConfigUpdate.TitleLineSpacingSub ->
+            intMutation(ReadStyleIntKey.TitleLineSpacingSub, value)
+        is ConfigUpdate.TitleSize -> intMutation(ReadStyleIntKey.TitleSize, value)
+        is ConfigUpdate.TitleTopSpacing -> intMutation(ReadStyleIntKey.TitleTopSpacing, value)
+        is ConfigUpdate.TitleBottomSpacing ->
+            intMutation(ReadStyleIntKey.TitleBottomSpacing, value)
+        is ConfigUpdate.TitleColor -> colorMutation(ReadStyleColorKey.Title, color)
+        is ConfigUpdate.TitleColorNight -> colorMutation(ReadStyleColorKey.TitleNight, color)
+        is ConfigUpdate.TitleFont -> stringMutation(ReadStyleStringKey.TitleFont, path)
+        is ConfigUpdate.TitleSegType -> intMutation(ReadStyleIntKey.TitleSegType, value)
+        is ConfigUpdate.TitleSegDistance -> intMutation(ReadStyleIntKey.TitleSegDistance, value)
+        is ConfigUpdate.TitleSegFlag -> stringMutation(ReadStyleStringKey.TitleSegFlag, value)
+        is ConfigUpdate.HeaderMode -> intMutation(ReadStyleIntKey.HeaderMode, value)
+        is ConfigUpdate.FooterMode -> intMutation(ReadStyleIntKey.FooterMode, value)
+        is ConfigUpdate.TipHeaderLeft -> intMutation(ReadStyleIntKey.TipHeaderLeft, value)
+        is ConfigUpdate.TipHeaderMiddle -> intMutation(ReadStyleIntKey.TipHeaderMiddle, value)
+        is ConfigUpdate.TipHeaderRight -> intMutation(ReadStyleIntKey.TipHeaderRight, value)
+        is ConfigUpdate.TipFooterLeft -> intMutation(ReadStyleIntKey.TipFooterLeft, value)
+        is ConfigUpdate.TipFooterMiddle -> intMutation(ReadStyleIntKey.TipFooterMiddle, value)
+        is ConfigUpdate.TipFooterRight -> intMutation(ReadStyleIntKey.TipFooterRight, value)
+        is ConfigUpdate.HeaderFont -> stringMutation(ReadStyleStringKey.HeaderFont, path)
+        is ConfigUpdate.CustomTipHeaderLeft ->
+            stringMutation(ReadStyleStringKey.CustomTipHeaderLeft, value)
+        is ConfigUpdate.CustomTipHeaderMiddle ->
+            stringMutation(ReadStyleStringKey.CustomTipHeaderMiddle, value)
+        is ConfigUpdate.CustomTipHeaderRight ->
+            stringMutation(ReadStyleStringKey.CustomTipHeaderRight, value)
+        is ConfigUpdate.CustomTipFooterLeft ->
+            stringMutation(ReadStyleStringKey.CustomTipFooterLeft, value)
+        is ConfigUpdate.CustomTipFooterMiddle ->
+            stringMutation(ReadStyleStringKey.CustomTipFooterMiddle, value)
+        is ConfigUpdate.CustomTipFooterRight ->
+            stringMutation(ReadStyleStringKey.CustomTipFooterRight, value)
+        is ConfigUpdate.HeaderFontSize -> intMutation(ReadStyleIntKey.HeaderFontSize, value)
+        is ConfigUpdate.FooterFont -> stringMutation(ReadStyleStringKey.FooterFont, path)
+        is ConfigUpdate.FooterFontSize -> intMutation(ReadStyleIntKey.FooterFontSize, value)
+        is ConfigUpdate.ApplyHeaderStyle ->
+            booleanMutation(ReadStyleBooleanKey.ApplyHeaderStyle, value)
+        is ConfigUpdate.TipHeaderColor -> colorMutation(ReadStyleColorKey.TipHeader, color)
+        is ConfigUpdate.TipHeaderColorNight ->
+            colorMutation(ReadStyleColorKey.TipHeaderNight, color)
+        is ConfigUpdate.TipFooterColor -> colorMutation(ReadStyleColorKey.TipFooter, color)
+        is ConfigUpdate.TipFooterColorNight ->
+            colorMutation(ReadStyleColorKey.TipFooterNight, color)
+        is ConfigUpdate.TipDividerColor -> colorMutation(ReadStyleColorKey.TipDivider, color)
+        is ConfigUpdate.PageAnim -> intMutation(ReadStyleIntKey.PageAnim, value)
+        is ConfigUpdate.TextShadow -> booleanMutation(ReadStyleBooleanKey.TextShadow, value)
+        is ConfigUpdate.ShadowRadius -> floatMutation(ReadStyleFloatKey.ShadowRadius, value)
+        is ConfigUpdate.ShadowDx -> floatMutation(ReadStyleFloatKey.ShadowDx, value)
+        is ConfigUpdate.ShadowDy -> floatMutation(ReadStyleFloatKey.ShadowDy, value)
+        is ConfigUpdate.ShadowColor -> colorMutation(ReadStyleColorKey.Shadow, color)
+        is ConfigUpdate.Underline -> booleanMutation(ReadStyleBooleanKey.Underline, value)
+        is ConfigUpdate.DottedLine -> booleanMutation(ReadStyleBooleanKey.DottedLine, value)
+        is ConfigUpdate.UnderlineExtend ->
+            booleanMutation(ReadStyleBooleanKey.UnderlineExtend, value)
+        is ConfigUpdate.UnderlineHeight -> intMutation(ReadStyleIntKey.UnderlineHeight, value)
+        is ConfigUpdate.UnderlinePadding -> intMutation(ReadStyleIntKey.UnderlinePadding, value)
+        is ConfigUpdate.DottedBase -> floatMutation(ReadStyleFloatKey.DottedBase, value)
+        is ConfigUpdate.DottedRatio -> floatMutation(ReadStyleFloatKey.DottedRatio, value)
+        is ConfigUpdate.UnderlineColor -> colorMutation(ReadStyleColorKey.Underline, color)
+        is ConfigUpdate.PaddingTop -> intMutation(ReadStyleIntKey.PaddingTop, value)
+        is ConfigUpdate.PaddingBottom -> intMutation(ReadStyleIntKey.PaddingBottom, value)
+        is ConfigUpdate.PaddingLeft -> intMutation(ReadStyleIntKey.PaddingLeft, value)
+        is ConfigUpdate.PaddingRight -> intMutation(ReadStyleIntKey.PaddingRight, value)
+        is ConfigUpdate.HeaderPaddingTop -> intMutation(ReadStyleIntKey.HeaderPaddingTop, value)
+        is ConfigUpdate.HeaderPaddingBottom ->
+            intMutation(ReadStyleIntKey.HeaderPaddingBottom, value)
+        is ConfigUpdate.HeaderPaddingLeft -> intMutation(ReadStyleIntKey.HeaderPaddingLeft, value)
+        is ConfigUpdate.HeaderPaddingRight ->
+            intMutation(ReadStyleIntKey.HeaderPaddingRight, value)
+        is ConfigUpdate.ShowHeaderLine ->
+            booleanMutation(ReadStyleBooleanKey.ShowHeaderLine, value)
+        is ConfigUpdate.FooterPaddingTop -> intMutation(ReadStyleIntKey.FooterPaddingTop, value)
+        is ConfigUpdate.FooterPaddingBottom ->
+            intMutation(ReadStyleIntKey.FooterPaddingBottom, value)
+        is ConfigUpdate.FooterPaddingLeft -> intMutation(ReadStyleIntKey.FooterPaddingLeft, value)
+        is ConfigUpdate.FooterPaddingRight ->
+            intMutation(ReadStyleIntKey.FooterPaddingRight, value)
+        is ConfigUpdate.ShowFooterLine ->
+            booleanMutation(ReadStyleBooleanKey.ShowFooterLine, value)
+        is ConfigUpdate.BgStr -> stringMutation(ReadStyleStringKey.BgStr, value)
+        is ConfigUpdate.BgStrNight -> stringMutation(ReadStyleStringKey.BgStrNight, value)
+        is ConfigUpdate.BgStrEInk -> stringMutation(ReadStyleStringKey.BgStrEInk, value)
+        is ConfigUpdate.BgType -> intMutation(ReadStyleIntKey.BgType, value)
+        is ConfigUpdate.BgTypeNight -> intMutation(ReadStyleIntKey.BgTypeNight, value)
+        is ConfigUpdate.BgTypeEInk -> intMutation(ReadStyleIntKey.BgTypeEInk, value)
+        is ConfigUpdate.BgAlpha -> intMutation(ReadStyleIntKey.BgAlpha, value)
+        is ConfigUpdate.StatusIconDark ->
+            booleanMutation(ReadStyleBooleanKey.StatusIconDark, value)
+        is ConfigUpdate.StyleName -> stringMutation(ReadStyleStringKey.StyleName, value)
+        else -> null
+    }
+
+}
+
+internal fun intMutation(key: ReadStyleIntKey, value: Int) =
+    ReadStyleMutation.IntValue(key, value)
+
+internal fun floatMutation(key: ReadStyleFloatKey, value: Float) =
+    ReadStyleMutation.FloatValue(key, value)
+
+internal fun booleanMutation(key: ReadStyleBooleanKey, value: Boolean) =
+    ReadStyleMutation.BooleanValue(key, value)
+
+internal fun stringMutation(key: ReadStyleStringKey, value: String) =
+    ReadStyleMutation.StringValue(key, value)
+
+internal fun colorMutation(key: ReadStyleColorKey, value: Int) =
+    ReadStyleMutation.ColorValue(key, value)

app/src/test/java/io/legado/app/ui/book/read/ReadBookDomainSplitBoundaryTest.kt

@@ -130,6 +130,13 @@ class ReadBookDomainSplitBoundaryTest {
                 ),
                 stateTypes = listOf("ContentEditUiState"),
             ),
+            // 配置分发域无自持状态：stateFields 为空，靠 stateTypes 守「158 分支不回流 VM」
+            DomainSplit(
+                name = "配置更新分发",
+                delegateFile = "io/legado/app/ui/book/read/ReadConfigUpdateDelegate.kt",
+                stateFields = emptySet(),
+                stateTypes = listOf("is ConfigUpdate."),
+            ),
         )
 
         val APP_DB_DAO = Regex("""\bappDb\.[A-Za-z0-9_]*Dao\b""")