[datlechin]

• Header right side goes from 5 items to 4: globe · GitHub 6.2k · Account · Download.
• Language: a 40px globe button named "Language: English", opening the same menu. The footer keeps the full menu with the endonym.
• Theme: removed from the header. It stays in the footer bar and the mobile menu.
• Theme default: system instead of light, in the shared head-theme.blade.php and lib/theme.ts. A stored choice still wins. Ships together with TableProApp/license#112, which carries the same two files.
• GitHub now shows whenever the desktop row does, not only from 1280px.
• WIDE_HEADER_LOCALES: es and fr only (was de, es, fr, it, pt-BR). Widths re-measured in Chromium with GitHub at its widest. German is exactly 960 of 960.
• Design docs, CLAUDE.md and shared-file hashes updated.

Why: in a rendered survey of 40 sites, all 7 sites with a theme control follow the OS by default and most keep it out of the header. Language stays at the top as a globe, because W3C, NN/g and USWDS ask for a visible control there and this site never redirects by language.