If you sent it in to get the sights installed or adjusted and they pushed the front sight, then yes, they could have done a better job.

It doesn't take much to pad the sight to prevent the sight pusher from marring the finish. A piece of heavy paper, like the back of a match book, or a business card is plenty.

It is however not as easy to avoid removing any blue in the dove tail. You need to file the bottom of the sight enough to get a snug fit in the dove tail, but you do need it to be snug enough not to move. There's a very thin line between not removing any bluing and leaving it too loose for reliable service.

Back in the day when silver solder was to attach sights, it was pretty common to repair any damage to the finish with cold blue and with the right bluing agent and a skilled hand, it could be blended well enough that the repair wasn't detectable. But that took someone who actually cared, and that's what you paid for when you selected the gunsmith.

In this case you can still use cold blue to cover the marred blue. Just degrease it thoroughly with 90% rubbing alcohol and apply cold blue with a Q-tip. Rub it a bit, wipe it off with a clean cotton cloth and repeat until it's as dark as you need it to be. With a matte finish, just don't polish it out like you would for a gloss finish.

As for the ding in the slide. It's interesting that it appears to have finish on it. That suggests it was there when manufactured, and is not in fact damage done during the repair.