Retroactive review Phase 2.2: audit priority molecules, fix P0/P1

- AddOnOption: add aria-disabled when disabled (P1 a11y)
- ProviderCardCompact: add maxLines={1} on name to prevent overflow (P2 UX)
- ServiceOption: price uses labelLg variant instead of h6 + hardcoded fontWeight (P1 theming)

Audit scores: ServiceOption 13/20, AddOnOption 14/20, ProviderCardCompact 15/20

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/molecules/ProviderCardCompact/ProviderCardCompact.tsx

@@ -95,7 +95,7 @@ export const ProviderCardCompact = React.forwardRef<HTMLDivElement, ProviderCard
             minWidth: 0,
           }}
         >
-          <Typography variant="h6" component="span">
+          <Typography variant="h6" component="span" maxLines={1}>
             {name}
           </Typography>