1.6.0: a user asked, so I shipped it

Small update to the one-time-purchase experiment I've been posting about here.

A user asked me: "why can't I just type the weight in?" They were right. The app made you finish a set first, then edit it. 1.6.0 fixes that, and adds RPE tracking a few people had asked for.

Nothing philosophical this time. Someone who already owns the app wanted it to work slightly better, so it does now. No new tier, no upsell, no "vote in our feedback portal." That is the whole pitch, and honestly it is the part of building this I enjoy most.