Plan step 40. ErrorPage::fallbackStyles() now inlines
Stylesheets::bundle() of the foundation and error-page.css (which
imports button.css and shape.css) rather than a hand-copied
stylesheet, so the fallback can never drift from the built version.
Every @font-face block is dropped structurally (withoutFontFace(),
brace-balanced, not a text search) since there is no build to serve
the font file; --md-ref-typeface-brand already lists ui-sans-serif,
system-ui and sans-serif after the brand name, so the page still gets
a sensible system stack. The scheme half comes from
Scheme::forStylesheet() drawn through SchemeStylesheet::levels(), in
material-scheme.css's own selector shape: standard, the medium and
high contrast levels, and a block per colour profile keyed on
[data-scheme] (the theme script has already resolved and written the
active one to <html> before this stylesheet is read, so nothing here
picks one in PHP). Both halves are cached per worker, the scheme half
by the scheme file's path and mtime.
Tests: both render paths, the inlined CSS's shape (no @import, no
relative url(), no @font-face, the button/shape/error-page rules, the
scheme's roles, [data-contrast='high'] and a profile block), and a new
browser test that forces the fallback and checks the button, the
shape and a dark-mode repaint.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
