Congratulations! Super cool. One of the first applications I was blown away by, for many different reasons, was OmniDictionary <https://web.archive.org/web/20050310043334/http://www.omnigr...>. It was something that I couldn't imagine existing, but did, and it was one of the first apps the company I worked for at the time had created. (It relied on a server!? This was an ENTIRE app?)
And 14 years ago, some servers still existed. They're hard to find now.
It always struck me as something fantastic to a) learn how to interface with a server b) learn cocoa/objective-c/etc c) redesign a simple app (https://www.omnigroup.com/assets/img/app/graffle-7/mac/full-...). Something you've just described in detail. Well, most of it.