test: expand exporter/css/a11y/i18n regressions and add e2e skip-link focus check

lib/schema/page.ts

@@ -37,6 +37,11 @@ const sectionTestimonialsSchema = z.object({
   props: z.object({ items: z.array(z.object({ author: z.string().min(1), quote: z.string().min(1) })).min(1) }),
 })
 
+const sectionBenefitsSchema = z.object({
+  type: z.literal('benefits'),
+  props: z.object({ items: z.array(z.string().min(1)).min(1) }),
+})
+
 // 확장: hero, faq, cta, features, testimonials 허용
 const sectionSchema = z.union([
   sectionHeroSchema,
@@ -44,6 +49,7 @@ const sectionSchema = z.union([
   sectionCtaSchema,
   sectionFeaturesSchema,
   sectionTestimonialsSchema,
+  sectionBenefitsSchema,
 ])
 
 const baseField = {
@@ -52,6 +58,7 @@ const baseField = {
   required: z.boolean().optional().default(false),
   pattern: z.string().optional(),
   maxLength: z.number().int().positive().optional(),
+  help: z.string().optional(),
 }
 
 const textField = z.object({ type: z.literal('text'), ...baseField })