better migration progress bar (#1993)

* better migration progress bar

* show different messages based on setup type and fix modal height

* type safety

Co-authored-by: Matt Hill <matthewonthemoon@gmail.com>

backend/src/backup/restore.rs

@@ -179,7 +179,7 @@ impl ProgressInfo {
         }
 
         SetupStatus {
-            total_bytes,
+            total_bytes: Some(total_bytes),
             bytes_transferred,
             complete: false,
         }