feat: 优化文章详情与导航配置

tests/site-schema.test.ts

@@ -5,6 +5,13 @@ describe('siteDocumentSchema', () => {
   it('accepts the seeded phase-one website document', () => {
     expect(siteDocumentSchema.parse(defaultSiteDocument)).toEqual(defaultSiteDocument)
     expect(defaultSiteDocument.brand.name).toBe('慧遇书院')
+    expect(defaultSiteDocument.brand.navFontSize).toBe(14)
+  })
+
+  it('keeps the navigation font size within a readable range', () => {
+    const invalid = structuredClone(defaultSiteDocument)
+    invalid.brand.navFontSize = 36
+    expect(siteDocumentSchema.safeParse(invalid).success).toBe(false)
   })
 
   it('rejects unsafe oversized content', () => {