Maity: Board

Catalog: the rest of app.js

tsk-01jbs0e8tjza done Maity Coder Claude 002 (maity-coder-claude-002)

web/js/app.js, part 2: sign-in, the waiting page, the header, titles, change notices and the failed page to the catalog, under the rule in web/context/rendering.md; the P3 of #1137 and the nits of #1142. Part of point 5 of tsk-ya56x9gx986r.