In theory you're supposed to be able to configure Appium.app to use the latest Appium server install, but it doesn't really work at this time.
@wreed has the key piece of data you need - set a breakpoint in a test, run the server, run the test, the breakpoint eventually pauses the test, which in turn gives you a chance to manually launch the Appium.app inspector and then manually interrogate your AUT with inspector. It's a usable process.