Caught by Lighthouse on prod:
1. CRITICAL: support-link.mdx and signing-in.mdx used the MDX expression
`{URLS.x}` inside Markdown-link parens, which MDX doesn't evaluate —
the resulting href was URL-encoded '%7BURLS.whmcsTicket%7D' on every
page with a Support partial. Replaced with HTML anchors so the
expression evaluates.
2. Light-mode --sl-color-text-accent was the brand teal (#00d4aa) on a
cream background = 1.73:1 contrast. Introduced --anhh-accent-on-light
(#047857) at ~6:1 for inline accent text/links. Brand graphics keep
the original teal.
3. Bumped light-mode --anhh-text-secondary and --anhh-text-muted to
#334155 / #475569 so muted UI text clears AA.
4. Hub brand link aria-label now includes 'Knowledge Base' so the
accessible name covers the visible text.
Starlight's default uses --sl-color-text-accent (our teal #00d4aa) as
the active-item background, which gives ~3:1 contrast vs the dark
inverted text — under WCAG AA (4.5:1). Override with primary blue
+ white text for ~9:1.
Note: customCss loads before Starlight's component CSS, so the rule
needs (0,2,1) specificity to win against Starlight's scoped (0,2,0).
