Stop link buttons claiming a pressed state, and lift tab contrast

A Button rendered as a link emitted aria-pressed="", which is not allowed
on a link and fails an accessibility check on every page that uses one
for a secondary action. A link has no pressed state, so the attribute is
gone from that branch; a real button still carries it.

An unselected tab used the muted text colour, which does not reach 4.5:1
against the tab strip at this size. It now blends back toward the text
colour, and the selected tab still reads as selected through its surface,
accent and shadow.

The visual contract manifest is regenerated to match.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/ui-visual-contract-0.8.json

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