fix(frontend): FormLinkをボタンとして使用した際にエラーが出る問題を修正

packages/frontend/src/components/form/link.vue

@@ -4,31 +4,42 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<div :class="[$style.root, { [$style.inline]: inline }]">
+<component
-	<a v-if="external" :class="$style.main" class="_button" :href="to" target="_blank">
+	:is="to ? 'div' : 'button'"
+	:class="[
+		$style.root,
+		{
+			[$style.inline]: inline,
+			'_button': !to,
+		},
+	]"
+>
+	<component
+		:is="to ? (external ? 'a' : 'MkA') : 'div'"
+		:class="[$style.main, { [$style.active]: active }]"
+		class="_button"
+		v-bind="to ? (external ? { href: to, target: '_blank' } : { to, behavior }) : {}"
+	>
 		<span :class="$style.icon"><slot name="icon"></slot></span>
-		<span :class="$style.text"><slot></slot></span>
+		<div :class="$style.headerText">
+			<div>
+				<MkCondensedLine :minScale="2 / 3"><slot></slot></MkCondensedLine>
+			</div>
+			<div v-if="$slots.caption" :class="$style.headerTextSub">
+				<MkCondensedLine :minScale="2 / 3"><slot name="caption"></slot></MkCondensedLine>
+			</div>
+		</div>
 		<span :class="$style.suffix">
 			<span :class="$style.suffixText"><slot name="suffix"></slot></span>
-			<i class="ti ti-external-link"></i>
+			<i :class="to && external ? 'ti ti-external-link' : 'ti ti-chevron-right'"></i>
 		</span>
-	</a>
+	</component>
-	<MkA v-else :class="[$style.main, { [$style.active]: active }]" class="_button" :to="to" :behavior="behavior">
+</component>
-		<span :class="$style.icon"><slot name="icon"></slot></span>
-		<span :class="$style.text"><slot></slot></span>
-		<span :class="$style.suffix">
-			<span :class="$style.suffixText"><slot name="suffix"></slot></span>
-			<i class="ti ti-chevron-right"></i>
-		</span>
-	</MkA>
-</div>
 </template>
 
 <script lang="ts" setup>
-import { } from 'vue';
-
 const props = defineProps<{
-	to: string;
+	to?: string;
 	active?: boolean;
 	external?: boolean;
 	behavior?: null | 'window' | 'browser';
@@ -75,17 +86,23 @@ const props = defineProps<{
 	&:empty {
 		display: none;
 
-		& + .text {
+		& + .headerText {
 			padding-left: 4px;
 		}
 	}
 }
 
-.text {
+.headerText {
-	flex-shrink: 1;
+	white-space: nowrap;
-	white-space: normal;
+	text-overflow: ellipsis;
+	text-align: start;
+	overflow: hidden;
 	padding-right: 12px;
-	text-align: center;
+}
+
+.headerTextSub {
+	color: var(--fgTransparentWeak);
+	font-size: .85em;
 }
 
 .suffix {