improved library scan speeds, added library manager component

-libraries tab now opens a library manager
-choose library directory, manually soft scan and rescan
-batched db queues
-mp3 header-based duration extraction

backend/database/sql/sqlcgen/recordings.sql.go

@@ -86,6 +86,15 @@ func (q *Queries) CreateRecordingFull(ctx context.Context, arg CreateRecordingFu
 	return i, err
 }
 
+const deleteAllRecordings = `-- name: DeleteAllRecordings :exec
+DELETE FROM recordings
+`
+
+func (q *Queries) DeleteAllRecordings(ctx context.Context) error {
+	_, err := q.db.ExecContext(ctx, deleteAllRecordings)
+	return err
+}
+
 const deleteRecording = `-- name: DeleteRecording :exec
 DELETE FROM recordings 
 WHERE id = ?