refactor: decompose anime handler and parallelize for-you fetches

internal/db/helpers.go

@@ -18,3 +18,7 @@ func DisplayTitle(titleEnglish, titleJapanese sql.NullString, titleOriginal stri
 func (r GetUserWatchListRow) DisplayTitle() string {
 	return DisplayTitle(r.TitleEnglish, r.TitleJapanese, r.TitleOriginal)
 }
+
+func (r GetContinueWatchingEntriesRow) DisplayTitle() string {
+	return DisplayTitle(r.TitleEnglish, r.TitleJapanese, r.TitleOriginal)
+}