mainly whitespace, but also some generic qol improvements

startup_args.py

@@ -30,7 +30,7 @@ def parse_startup_args(argv: list[str]) -> StartupArgs:
                          a fixed position, so it survives regardless of
                          whether --finish-update precedes it.
     """
-    
+
     finish_update = "--finish-update" in argv[1:]
 
     initial_file = None