Error out on cover search for V2 galleries

app/src/main/kotlin/com/hippo/ehviewer/client/EhUtils.kt

@@ -84,12 +84,16 @@ object EhUtils {
     )
     private val CATEGORY_STRINGS = CATEGORY_VALUES.entries.map { (k, v) -> v to k }
 
+    private val ImageHashRegex = Regex("[0-9a-f]{40}")
+
     val isExHentai: Boolean
         get() = Settings.gallerySite.value == EhUrl.SITE_EX
 
     val isMpvAvailable
         get() = EhCookieStore.getHathPerks()?.contains('q') == true
 
+    fun getImageHash(thumbUrl: String) = ImageHashRegex.find(thumbUrl)?.groupValues[0]
+
     fun getCategory(type: String?): Int {
         for (entry in CATEGORY_STRINGS) {
             for (str in entry.first) {

app/src/main/kotlin/com/hippo/ehviewer/ui/screen/GalleryDetailContent.kt

@@ -524,17 +524,17 @@ fun BelowHeader(galleryDetail: GalleryDetail) {
                 }
             },
         )
+        val invalidUrl = stringResource(R.string.error_invalid_url)
         EhIconButton(
             icon = Icons.Default.ImageSearch,
             text = stringResource(id = R.string.search_cover),
             onClick = {
-                val key = galleryDetail.thumbKey!!
-                navigate(
-                    ListUrlBuilder(
-                        mode = ListUrlBuilder.MODE_IMAGE_SEARCH,
-                        hash = key.substringAfterLast('/').substringBefore('-'),
-                    ).asDst(),
-                )
+                val hash = EhUtils.getImageHash(galleryDetail.thumbKey!!)
+                if (hash != null) {
+                    navigate(ListUrlBuilder(mode = ListUrlBuilder.MODE_IMAGE_SEARCH, hash = hash).asDst())
+                } else {
+                    launch { showSnackbar(invalidUrl) }
+                }
             },
         )
         val torrentText = stringResource(R.string.torrent_count, galleryDetail.torrentCount)