FX.146 DetailCraft: My profiles, custom profiles kept for every new model

A custom profile lived only in the model file, so a new model started without it. Now the Custom profile form has Keep in My profiles (ticked), and a My profiles list under it, kept in this browser (localStorage detailcraft.myprofiles, at most 200, cleaned on read by profiles.js cleanLibrary). Every new model (start-up and New) begins with them in model.state.profiles, so they save with the file. Keep button on a model's own profiles, Use here for a model that lacks one, Remove (models keep their copy), a taken name with other dimensions is refused. Per browser, not per account. Help: plates-and-profiles.md. Test tools/detailcraft-test/browser-myprofiles.mjs (15 checks). The same report also met 'only I-shape': shear tabs already take a channel BEAM but need an I-shape COLUMN, end plates need an I-shape beam; which one the person hit is unknown, no change made.