Make fallback icon grey

frontend/src/components/tasks/partials/file-preview.vue

@@ -1,14 +1,21 @@
 <template>
+	<!-- Preview image -->
 	<img
 		v-if="blobUrl"
 		:src="blobUrl"
 		alt="Attachment preview"
 	>
-	<icon
+
+	<!-- Fallback -->
+	<div
 		v-else
+		class="icon-wrapper"
+	>
+		<icon
 			size="6x"
 			icon="file-image"
 		/>
+	</div>
 </template>
 
 <script setup lang="ts">
@@ -44,4 +51,8 @@ img {
 	border-radius: $radius;
 	object-fit: cover;
 }
+
+.icon-wrapper {
+	color: var(--grey-500);
+}
 </style>