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/AddOnOption/AddOnOption.tsx

@@ -99,6 +99,7 @@ export const AddOnOption = React.forwardRef<HTMLDivElement, AddOnOptionProps>(
         selected={checked}
         padding="none"
         onClick={handleToggle}
+        aria-disabled={disabled || undefined}
         sx={[
           {
             p: 'var(--fa-card-padding-compact)',