Use Compose in Migrate tab (#7008)

* Use Compose in Migrate tab

* Add missing header

* Remove unused files

* Fix build after rebase

* Changes from review comments

app/src/main/sqldelight/data/mangas.sq

@@ -28,4 +28,12 @@ CREATE INDEX mangas_url_index ON mangas(url);
 getMangaById:
 SELECT *
 FROM mangas
-WHERE _id = :id;
+WHERE _id = :id;
+
+getSourceIdWithFavoriteCount:
+SELECT
+source,
+count(*)
+FROM mangas
+WHERE favorite = 1
+GROUP BY source;