feat(design): load tokens.css and typography.css

Also exclude .claude/** from ESLint to prevent plan files from
failing markdown lint rules.

Change-Id: Ia69a7916f60cc24beca8eb5956cf7808739f0494

Author: jd

eslint.config.js

@@ -16,6 +16,7 @@ export default [
       '.astro/**',
       'node_modules/**',
       '.github/**',
+      '.claude/**',
       'public/scalar-api-reference.js',
       'src/content/changelog/',
     ],

src/components/HeadCommon.astro

@@ -6,7 +6,9 @@ import '@fontsource/inter/500.css';
 import '@fontsource/inter/600.css';
 import '@fontsource/inter/700.css';
 
+import '../styles/tokens.css';
 import '../styles/theme.css';
+import '../styles/typography.css';
 import '../styles/index.css';
 ---