perf(frontend): use css-native implementation for spacer rather than vue component

packages/frontend/src/pages/channel.vue

@@ -5,7 +5,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <template>
 <PageWithHeader v-model:tab="tab" :actions="headerActions" :tabs="headerTabs" :swipable="true">
-	<MkSpacer :contentMax="700">
+	<div class="_spacer" style="--MI_SPACER-w: 700px;">
 		<div v-if="channel && tab === 'overview'" class="_gaps">
 			<div class="_panel" :class="$style.bannerContainer">
 				<XChannelFollowButton :channel="channel" :full="true" :class="$style.subscribe"/>
@@ -56,14 +56,14 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<MkInfo warn>{{ i18n.ts.notesSearchNotAvailable }}</MkInfo>
 			</div>
 		</div>
-	</MkSpacer>
+	</div>
 	<template #footer>
 		<div :class="$style.footer">
-			<MkSpacer :contentMax="700" :marginMin="16" :marginMax="16">
+			<div class="_spacer" style="--MI_SPACER-w: 700px; --MI_SPACER-min: 16px; --MI_SPACER-max: 16px;">
 				<div class="_buttonsCenter">
 					<MkButton inline rounded primary gradate @click="openPostForm()"><i class="ti ti-pencil"></i> {{ i18n.ts.postToTheChannel }}</MkButton>
 				</div>
-			</MkSpacer>
+			</div>
 		</div>
 	</template>
 </PageWithHeader>