diff --git a/packages/client/src/components/global/MkPageHeader.vue b/packages/client/src/components/global/MkPageHeader.vue
index 464a965b3..c6568bbff 100644
--- a/packages/client/src/components/global/MkPageHeader.vue
+++ b/packages/client/src/components/global/MkPageHeader.vue
@@ -1,247 +1,314 @@
 <template>
-<div v-if="show" ref="el" class="fdidabkb" :class="{ slim: narrow, thin: thin_ }" :style="{ background: bg }" @click="onClick">
-	<div v-if="narrow" class="buttons left" @click="openAccountMenu">
+	<div v-if="show" ref="el" class="fdidabkb" :class="{ slim: narrow, thin: thin_ }" :style="{ background: bg }" @click="onClick">
+		<div v-if="narrow" class="buttons left" @click="openAccountMenu">
 		<MkAvatar v-if="props.displayMyAvatar && $i" class="avatar" :user="$i" :disable-preview="true"/>
 	</div>
 	<template v-if="metadata">
 		<div v-if="!hideTitle" class="titleContainer" @click="showTabsPopup">
 			<MkAvatar v-if="metadata.avatar" class="avatar" :user="metadata.avatar" :disable-preview="true" :show-indicator="true"/>
-			<i v-else-if="metadata.icon && !narrow" class="icon" :class="metadata.icon"></i>
-
-			<div class="title">
-				<MkUserName v-if="metadata.userName" :user="metadata.userName" :nowrap="true" class="title"/>
-				<div v-else-if="metadata.title && !(tabs != null && tabs.length > 0 && narrow)" class="title">{{ metadata.title }}</div>
-				<div v-if="!narrow && metadata.subtitle" class="subtitle">
-					{{ metadata.subtitle }}
+				<i v-else-if="metadata.icon && !narrow" class="icon" :class="metadata.icon"></i>
+	
+				<div class="title">
+					<MkUserName v-if="metadata.userName" :user="metadata.userName" :nowrap="true" class="title"/>
+					<div v-else-if="metadata.title && !(tabs != null && tabs.length > 0 && narrow)" class="title">{{ metadata.title }}</div>
+					<div v-if="!narrow && metadata.subtitle" class="subtitle">
+						{{ metadata.subtitle }}
+					</div>
 				</div>
 			</div>
-		</div>
-		<div ref="tabsEl" v-if="hasTabs" class="tabs">
-			<button v-for="tab in tabs" :ref="(el) => tabRefs[tab.key] = el" v-tooltip.noDelay="tab.title" class="tab _button" :class="{ active: tab.key != null && tab.key === props.tab }" @mousedown="(ev) => onTabMousedown(tab, ev)" @click="(ev) => onTabClick(tab, ev)">
-				<i v-if="tab.icon" class="icon" :class="tab.icon"></i>
-				<span v-if="deviceKind !== 'desktop' || isTouchUsing || (!tab.iconOnly && !narrow)" class="title">{{ tab.title }}</span>
-			</button>
-			<div ref="tabHighlightEl" class="highlight"></div>
-		</div>
-	</template>
-	<div class="buttons right">
-		<template v-for="action in actions">
-			<button v-tooltip.noDelay="action.text" class="_button button" :class="{ highlighted: action.highlighted }" @click.stop="action.handler" @touchstart="preventDrag"><i :class="action.icon"></i></button>
+			<div ref="tabsEl" v-if="hasTabs" class="tabs">
+				<button v-for="tab in tabs" :ref="(el) => tabRefs[tab.key] = el" v-tooltip.noDelay="tab.title" class="tab _button" :class="{ active: tab.key != null && tab.key === props.tab }" @mousedown="(ev) => onTabMousedown(tab, ev)" @click="(ev) => onTabClick(tab, ev)">
+					<i v-if="tab.icon" class="icon" :class="tab.icon"></i>
+					<span v-if="deviceKind !== 'desktop' || isTouchUsing || (!tab.iconOnly && !narrow)" class="title">{{ tab.title }}</span>
+				</button>
+				<div ref="tabHighlightEl" class="highlight"></div>
+			</div>
 		</template>
+		<div class="buttons right">
+			<template v-for="action in actions">
+				<button v-tooltip.noDelay="action.text" class="_button button" :class="{ highlighted: action.highlighted }" @click.stop="action.handler" @touchstart="preventDrag"><i :class="action.icon"></i></button>
+			</template>
+		</div>
 	</div>
-</div>
 </template>
-
+	
 <script lang="ts" setup>
-import { computed, onMounted, onUnmounted, ref, inject, watch, shallowReactive, nextTick, reactive } from 'vue';
-import tinycolor from 'tinycolor2';
-import { popupMenu } from '@/os';
-import { scrollToTop } from '@/scripts/scroll';
-import { i18n } from '@/i18n';
-import { globalEvents } from '@/events';
-import { deviceKind } from '@/scripts/device-kind';
-import { isTouchUsing } from '@/scripts/touch';
-import { injectPageMetadata } from '@/scripts/page-metadata';
-import { $i, openAccountMenu as openAccountMenu_ } from '@/account';
-
-type Tab = {
-	key?: string | null;
-	title: string;
-	icon?: string;
-	iconOnly?: boolean;
-	onClick?: (ev: MouseEvent) => void;
-};
-
-const props = defineProps<{
-	tabs?: Tab[];
-	tab?: string;
-	actions?: {
-		text: string;
-		icon: string;
-		handler: (ev: MouseEvent) => void;
-	}[];
-	thin?: boolean;
-	displayMyAvatar?: boolean;
-}>();
-
-const emit = defineEmits<{
-	(ev: 'update:tab', key: string);
-}>();
-
-const metadata = injectPageMetadata();
-
-const hideTitle = inject('shouldOmitHeaderTitle', false);
-const thin_ = props.thin || inject('shouldHeaderThin', false);
-
-const el = $ref<HTMLElement | null>(null);
-const tabRefs = {};
-const tabHighlightEl = $ref<HTMLElement | null>(null);
-const tabsEl = $ref<HTMLElement | null>(null);
-const bg = ref(null);
-let narrow = $ref(false);
-const height = ref(0);
-const hasTabs = $computed(() => props.tabs && props.tabs.length > 0);
-const hasActions = $computed(() => props.actions && props.actions.length > 0);
-const show = $computed(() => {
-	return !hideTitle || hasTabs || hasActions;
-});
-
-const openAccountMenu = (ev: MouseEvent) => {
-	openAccountMenu_({
-		withExtraOperation: true,
-	}, ev);
-};
-
-const showTabsPopup = (ev: MouseEvent) => {
-	if (!hasTabs) return;
-	if (!narrow) return;
-	ev.preventDefault();
-	ev.stopPropagation();
-	const menu = props.tabs.map(tab => ({
-		text: tab.title,
-		icon: tab.icon,
-		active: tab.key != null && tab.key === props.tab,
-		action: (ev) => {
-			onTabClick(tab, ev);
-		},
-	}));
-	popupMenu(menu, ev.currentTarget ?? ev.target);
-};
-
-const preventDrag = (ev: TouchEvent) => {
-	ev.stopPropagation();
-};
-
-const onClick = () => {
-	scrollToTop(el, { behavior: 'smooth' });
-};
-
-function onTabMousedown(tab: Tab, ev: MouseEvent): void {
-	// ユーザビリティの観点からmousedown時にはonClickは呼ばない
-	if (tab.key) {
-		emit('update:tab', tab.key);
-	}
-}
-
-function onTabClick(tab: Tab, ev: MouseEvent): void {
-	if (tab.onClick) {
+	import { computed, onMounted, onUnmounted, ref, inject, watch, shallowReactive, nextTick, reactive } from 'vue';
+	import tinycolor from 'tinycolor2';
+	import { popupMenu } from '@/os';
+	import { scrollToTop } from '@/scripts/scroll';
+	import { i18n } from '@/i18n';
+	import { globalEvents } from '@/events';
+	import { deviceKind } from '@/scripts/device-kind';
+	import { isTouchUsing } from '@/scripts/touch';
+	import { injectPageMetadata } from '@/scripts/page-metadata';
+	import { $i, openAccountMenu as openAccountMenu_ } from '@/account';
+	
+	type Tab = {
+		key?: string | null;
+		title: string;
+		icon?: string;
+		iconOnly?: boolean;
+		onClick?: (ev: MouseEvent) => void;
+	};
+	
+	const props = defineProps<{
+		tabs?: Tab[];
+		tab?: string;
+		actions?: {
+			text: string;
+			icon: string;
+			handler: (ev: MouseEvent) => void;
+		}[];
+		thin?: boolean;
+		displayMyAvatar?: boolean;
+	}>();
+	
+	const emit = defineEmits<{
+		(ev: 'update:tab', key: string);
+	}>();
+	
+	const metadata = injectPageMetadata();
+	
+	const hideTitle = inject('shouldOmitHeaderTitle', false);
+	const thin_ = props.thin || inject('shouldHeaderThin', false);
+	
+	const el = $ref<HTMLElement | null>(null);
+	const tabRefs = {};
+	const tabHighlightEl = $ref<HTMLElement | null>(null);
+	const tabsEl = $ref<HTMLElement | null>(null);
+	const bg = ref(null);
+	let narrow = $ref(false);
+	const height = ref(0);
+	const hasTabs = $computed(() => props.tabs && props.tabs.length > 0);
+	const hasActions = $computed(() => props.actions && props.actions.length > 0);
+	const show = $computed(() => {
+		return !hideTitle || hasTabs || hasActions;
+	});
+	
+	const openAccountMenu = (ev: MouseEvent) => {
+		openAccountMenu_({
+			withExtraOperation: true,
+		}, ev);
+	};
+	
+	const showTabsPopup = (ev: MouseEvent) => {
+		if (!hasTabs) return;
+		if (!narrow) return;
 		ev.preventDefault();
 		ev.stopPropagation();
-		tab.onClick(ev);
-	}
-	if (tab.key) {
-		emit('update:tab', tab.key);
-	}
-}
-
-const calcBg = () => {
-	const rawBg = metadata?.bg || 'var(--bg)';
-	const tinyBg = tinycolor(rawBg.startsWith('var(') ? getComputedStyle(document.documentElement).getPropertyValue(rawBg.slice(4, -1)) : rawBg);
-	tinyBg.setAlpha(0.85);
-	bg.value = tinyBg.toRgbString();
-};
-
-let ro: ResizeObserver | null;
-
-onMounted(() => {
-	calcBg();
-	globalEvents.on('themeChanged', calcBg);
-
-	watch(() => [props.tab, props.tabs], () => {
-		nextTick(() => {
-			const tabEl = tabRefs[props.tab];
-			if (tabEl && tabHighlightEl) {
-				// offsetWidth や offsetLeft は少数を丸めてしまうため getBoundingClientRect を使う必要がある
-				// https://developer.mozilla.org/ja/docs/Web/API/HTMLElement/offsetWidth#%E5%80%A4
-				const parentRect = tabsEl.getBoundingClientRect();
-				const rect = tabEl.getBoundingClientRect();
-				const left = (rect.left - parentRect.left + tabsEl?.scrollLeft);
-				tabHighlightEl.style.width = rect.width + 'px';
-				tabHighlightEl.style.left = left + 'px';
-				tabsEl.scrollTo({left: left - 80, behavior: "smooth"});
-			}
-		});
-	}, {
-		immediate: true,
-	});
-
-	if (el && el.parentElement) {
-		narrow = el.parentElement.offsetWidth < 500;
-		ro = new ResizeObserver((entries, observer) => {
-			if (el.parentElement && document.body.contains(el)) {
-				narrow = el.parentElement.offsetWidth < 500;
-			}
-		});
-		ro.observe(el.parentElement);
-	}
-});
-
-onUnmounted(() => {
-	globalEvents.off('themeChanged', calcBg);
-	if (ro) ro.disconnect();
-});
-</script>
-
-<style lang="scss" scoped>
-.fdidabkb {
-	--height: 55px;
-	display: flex;
-	width: 100%;
-	-webkit-backdrop-filter: var(--blur, blur(15px));
-	backdrop-filter: var(--blur, blur(15px));
-	border-bottom: solid 0.5px var(--divider);
-	contain: strict;
-	height: var(--height);
-
-	&.thin {
-		--height: 45px;
-
-		> .buttons {
-			> .button {
-				font-size: 0.9em;
-			}
+		const menu = props.tabs.map(tab => ({
+			text: tab.title,
+			icon: tab.icon,
+			active: tab.key != null && tab.key === props.tab,
+			action: (ev) => {
+				onTabClick(tab, ev);
+			},
+		}));
+		popupMenu(menu, ev.currentTarget ?? ev.target);
+	};
+	
+	const preventDrag = (ev: TouchEvent) => {
+		ev.stopPropagation();
+	};
+	
+	const onClick = () => {
+		scrollToTop(el, { behavior: 'smooth' });
+	};
+	
+	function onTabMousedown(tab: Tab, ev: MouseEvent): void {
+		// ユーザビリティの観点からmousedown時にはonClickは呼ばない
+		if (tab.key) {
+			emit('update:tab', tab.key);
 		}
 	}
-
-	&.slim {
-		> .titleContainer {
-			flex: 1;
-			margin: 0 auto;
-
-			> *:first-child {
+	
+	function onTabClick(tab: Tab, ev: MouseEvent): void {
+		if (tab.onClick) {
+			ev.preventDefault();
+			ev.stopPropagation();
+			tab.onClick(ev);
+		}
+		if (tab.key) {
+			emit('update:tab', tab.key);
+		}
+	}
+	
+	const calcBg = () => {
+		const rawBg = metadata?.bg || 'var(--bg)';
+		const tinyBg = tinycolor(rawBg.startsWith('var(') ? getComputedStyle(document.documentElement).getPropertyValue(rawBg.slice(4, -1)) : rawBg);
+		tinyBg.setAlpha(0.85);
+		bg.value = tinyBg.toRgbString();
+	};
+	
+	let ro: ResizeObserver | null;
+	
+	onMounted(() => {
+		calcBg();
+		globalEvents.on('themeChanged', calcBg);
+	
+		watch(() => [props.tab, props.tabs], () => {
+			nextTick(() => {
+				const tabEl = tabRefs[props.tab];
+				if (tabEl && tabHighlightEl) {
+					// offsetWidth や offsetLeft は少数を丸めてしまうため getBoundingClientRect を使う必要がある
+					// https://developer.mozilla.org/ja/docs/Web/API/HTMLElement/offsetWidth#%E5%80%A4
+					tabEl.addEventListener("transitionend", () => {
+						const parentRect = tabsEl.getBoundingClientRect();
+						const rect = tabEl.getBoundingClientRect();
+						const left = (rect.left - parentRect.left + tabsEl?.scrollLeft);
+						tabHighlightEl.style.width = rect.width + 'px';
+						tabHighlightEl.style.left = left + 'px';
+						tabsEl?.scrollTo({left: left - 80, behavior: "smooth"});
+					})
+				}
+			});
+		}, {
+			immediate: true,
+		});
+	
+		if (el && el.parentElement) {
+			narrow = el.parentElement.offsetWidth < 500;
+			ro = new ResizeObserver((entries, observer) => {
+				if (el.parentElement && document.body.contains(el)) {
+					narrow = el.parentElement.offsetWidth < 500;
+				}
+			});
+			ro.observe(el.parentElement);
+		}
+	});
+	
+	onUnmounted(() => {
+		globalEvents.off('themeChanged', calcBg);
+		if (ro) ro.disconnect();
+	});
+</script>
+	
+<style lang="scss" scoped>
+	.fdidabkb {
+		--height: 55px;
+		display: flex;
+		width: 100%;
+		-webkit-backdrop-filter: var(--blur, blur(15px));
+		backdrop-filter: var(--blur, blur(15px));
+		border-bottom: solid 0.5px var(--divider);
+		contain: strict;
+		height: var(--height);
+	
+		&.thin {
+			--height: 45px;
+	
+			> .buttons {
+				> .button {
+					font-size: 0.9em;
+				}
+			}
+		}
+	
+		&.slim {
+			> .titleContainer {
+				flex: 1;
+				margin: 0 auto;
+	
+				> *:first-child {
+					margin-left: auto;
+				}
+	
+				> *:last-child {
+					margin-right: auto;
+				}
+			}
+			> .tabs {
+				padding-inline: 12px;
+				mask: linear-gradient(to right, black 80%, transparent);
+				-webkit-mask: linear-gradient(to right, black 80%, transparent);
+				scrollbar-width: none;
+				&::-webkit-scrollbar {
+					display: none;
+				}
+				&::after { // Force right padding
+					content: "";
+					display: inline-block;
+					min-width: 20%;
+				}
+				> .tab {
+					&:not(.active) > .title {
+						font-size: 0;
+						opacity: 0;
+						margin-inline: 0;
+						transition: font-size .2s, opacity .1s;
+					}
+				}
+			}
+		}
+	
+		> .buttons {
+			--margin: 8px;
+			display: flex;
+			align-items: center;
+			height: var(--height);
+			margin: 0 var(--margin);
+	
+			&.left {
+				margin-right: auto;
+	
+				> .avatar {
+					$size: 32px;
+					display: inline-block;
+					width: $size;
+					height: $size;
+					vertical-align: bottom;
+					margin: 0 8px;
+					pointer-events: none;
+				}
+			}
+	
+			&.right {
 				margin-left: auto;
 			}
-
-			> *:last-child {
-				margin-right: auto;
-			}
-		}
-		> .tabs {
-			padding-inline: 12px;
-			mask: linear-gradient(to right, black 80%, transparent);
-			-webkit-mask: linear-gradient(to right, black 80%, transparent);
-			scrollbar-width: none;
-			&::-webkit-scrollbar {
+	
+			&:empty {
 				display: none;
 			}
-			&::after { // Force right padding
-				content: "";
-				display: inline-block;
-				min-width: 20%;
+	
+			> .button {
+				display: flex;
+				align-items: center;
+				justify-content: center;
+				height: calc(var(--height) - (var(--margin) * 2));
+				width: calc(var(--height) - (var(--margin) * 2));
+				box-sizing: border-box;
+				position: relative;
+				border-radius: 5px;
+	
+				&:hover {
+					background: rgba(0, 0, 0, 0.05);
+				}
+	
+				&.highlighted {
+					color: var(--accent);
+				}
+			}
+	
+			> .fullButton {
+				& + .fullButton {
+					margin-left: 12px;
+				}
 			}
 		}
-	}
-
-	> .buttons {
-		--margin: 8px;
-		display: flex;
-    align-items: center;
-		height: var(--height);
-		margin: 0 var(--margin);
-
-		&.left {
-			margin-right: auto;
-
+	
+		> .titleContainer {
+			display: flex;
+			align-items: center;
+			max-width: 400px;
+			overflow: auto;
+			white-space: nowrap;
+			text-align: left;
+			font-weight: bold;
+			flex-shrink: 0;
+			margin-left: 24px;
+			margin-right: 1rem;
+	
 			> .avatar {
 				$size: 32px;
 				display: inline-block;
@@ -251,139 +318,86 @@ onUnmounted(() => {
 				margin: 0 8px;
 				pointer-events: none;
 			}
-		}
-
-		&.right {
-			margin-left: auto;
-		}
-
-		&:empty {
-			display: none;
-		}
-
-		> .button {
-			display: flex;
-			align-items: center;
-			justify-content: center;
-			height: calc(var(--height) - (var(--margin) * 2));
-			width: calc(var(--height) - (var(--margin) * 2));
-			box-sizing: border-box;
-			position: relative;
-			border-radius: 5px;
-
-			&:hover {
-				background: rgba(0, 0, 0, 0.05);
+	
+			> .icon {
+				margin-right: 8px;
+				width: 16px;
+				text-align: center;
+				transform: translate(0em);
 			}
-
-			&.highlighted {
-				color: var(--accent);
-			}
-		}
-
-		> .fullButton {
-			& + .fullButton {
-				margin-left: 12px;
-			}
-		}
-	}
-
-	> .titleContainer {
-		display: flex;
-		align-items: center;
-		max-width: 400px;
-		overflow: auto;
-		white-space: nowrap;
-		text-align: left;
-		font-weight: bold;
-		flex-shrink: 0;
-		margin-left: 24px;
-		margin-right: 1rem;
-
-		> .avatar {
-			$size: 32px;
-			display: inline-block;
-			width: $size;
-			height: $size;
-			vertical-align: bottom;
-			margin: 0 8px;
-			pointer-events: none;
-		}
-
-		> .icon {
-			margin-right: 8px;
-			width: 16px;
-			text-align: center;
-			transform: translate(0em);
-		}
-
-		> .title {
-			min-width: 0;
-			overflow: hidden;
-			text-overflow: ellipsis;
-			white-space: nowrap;
-			line-height: 1.1;
-
-			> .subtitle {
-				opacity: 0.6;
-				font-size: 0.8em;
-				font-weight: normal;
-				white-space: nowrap;
+	
+			> .title {
+				min-width: 0;
 				overflow: hidden;
 				text-overflow: ellipsis;
-
-				&.activeTab {
-					text-align: center;
-
-					> .chevron {
-						display: inline-block;
-						margin-left: 6px;
+				white-space: nowrap;
+				line-height: 1.1;
+	
+				> .subtitle {
+					opacity: 0.6;
+					font-size: 0.8em;
+					font-weight: normal;
+					white-space: nowrap;
+					overflow: hidden;
+					text-overflow: ellipsis;
+	
+					&.activeTab {
+						text-align: center;
+	
+						> .chevron {
+							display: inline-block;
+							margin-left: 6px;
+						}
 					}
 				}
 			}
 		}
-	}
-
-	> .tabs {
-		position: relative;
-		width: 100%;
-		font-size: 1em;
-		overflow-x: auto;
-		white-space: nowrap;
-
-		> .tab {
-			display: inline-flex;
-			align-items: center;
+	
+		> .tabs {
 			position: relative;
-			padding: 0 10px;
-			height: 100%;
-			font-weight: normal;
-			opacity: 0.7;
-			transition: color .2s, opacity .2s;
-
-			&:hover {
-				opacity: 1;
+			width: 100%;
+			font-size: 1em;
+			overflow-x: auto;
+			white-space: nowrap;
+	
+			> .tab {
+				display: inline-flex;
+				align-items: center;
+				position: relative;
+				padding: 0 10px;
+				height: 100%;
+				font-weight: normal;
+				opacity: 0.7;
+				transition: color .2s, opacity .2s;
+	
+				&:hover {
+					opacity: 1;
+				}
+	
+				&.active {
+					opacity: 1;
+					color: var(--accent);
+					font-weight: 600;
+				}
+	
+				> .icon + .title {
+					margin-left: 8px;
+				}
+				> .title {
+					transition: font-size .2s, opacity .2s .15s;
+				}
 			}
-
-			&.active {
-				opacity: 1;
-				color: var(--accent);
-				font-weight: 600;
+	
+			> .highlight {
+				position: absolute;
+				bottom: 0;
+				height: 3px;
+				background: var(--accent);
+				border-radius: 999px;
+				transition: width .2s, left .2s;
+				transition-timing-function: cubic-bezier(0,0,0,1.2);
+				pointer-events: none;
 			}
-
-			> .icon + .title {
-				margin-left: 8px;
-			}
-		}
-
-		> .highlight {
-			position: absolute;
-			bottom: 0;
-			height: 3px;
-			background: var(--accent);
-			border-radius: 999px;
-			transition: all 0.2s ease;
-			pointer-events: none;
 		}
 	}
-}
 </style>