Fix cover fetching in compose views (#7315)

Make sure it passed thru the custom fetcher

app/src/main/java/eu/kanade/domain/manga/model/MangaCover.kt

@@ -0,0 +1,12 @@
+package eu.kanade.domain.manga.model
+
+/**
+ * Contains the required data for MangaCoverFetcher
+ */
+data class MangaCover(
+    val mangaId: Long,
+    val sourceId: Long,
+    val isMangaFavorite: Boolean,
+    val url: String?,
+    val lastModified: Long,
+)