The Google button used Google's prebuilt `gsi-material-button` (its own CSS
file + hardcoded hex colors), leaving it the odd one out: capped at 400px (its
`max-width` overrode `w-full`) so it sat narrower than the OpenID/GitHub
buttons, and rendered as a glaring white block in dark mode with no theming.
Render every SSO provider through one `DS::Button(variant: :outline,
full_width: true)` so the stack is consistent and reads as secondary to the
primary email "Log in" CTA. Google keeps its official multi-color "G" mark and
"Sign in with Google" wording (brand-compliant) via a new `google-icon.svg`
asset and an additive `icon_custom:` flag on the button (defaults false — no
change to any existing button). Delete `google-sign-in.css` and its import.
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