chore(client): tweak style

packages/client/src/pages/registry.keys.vue

 <template>
 <MkStickyContainer>
 	<template #header><MkPageHeader :actions="headerActions" :tabs="headerTabs"/></template>
-	<MkSpacer :content-max="600">
+	<MkSpacer :content-max="600" :margin-min="16">
 		<FormSplit>
 			<MkKeyValue class="_formBlock">
 				<template #key>{{ $ts._registry.domain }}</template>

packages/client/src/pages/registry.value.vue

 <template>
 <MkStickyContainer>
 	<template #header><MkPageHeader :actions="headerActions" :tabs="headerTabs"/></template>
-	<MkSpacer :content-max="600">
+	<MkSpacer :content-max="600" :margin-min="16">
 		<FormInfo warn>{{ $ts.editTheseSettingsMayBreakAccount }}</FormInfo>
 
 		<template v-if="value">

packages/client/src/pages/registry.vue

 <template>
 <MkStickyContainer>
 	<template #header><MkPageHeader :actions="headerActions" :tabs="headerTabs"/></template>
-	<MkSpacer :content-max="600">
+	<MkSpacer :content-max="600" :margin-min="16">
 		<MkButton primary @click="createKey">{{ i18n.ts._registry.createKey }}</MkButton>
 
 		<FormSection v-if="scopes">