Add a header rule beside the title or logo, and plain menu links

gizmolab's header is a logo with a striped rule filling the rest of the
row, and a menu of plain underlined links under it; nothing in the Design
tab could draw either. The rule (line, dots or stripes) is a theme option
drawn in the header text colour beside the title and logo modules — on
both sides when the header is centred — as table cells, so it is as tall
as the brand and old browsers lay it out the same; it is hidden on phones
so a long title can wrap. The menu's link style gains "plain, underlined"
next to bold and uppercase.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Sd8UPWrvyYCLj97JexNw3A

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