chore(docs): eslint migration + extractor updates

Migrate docs to eslint flat config (build-script console override); doc
extractor points at configs/eslint.

docs/nuxt.config.ts

@@ -38,14 +38,25 @@ export default defineNuxtConfig({
   },
 
   app: {
+    pageTransition: { name: 'page', mode: 'out-in' },
     head: {
       title: '@robonen/tools — Documentation',
       meta: [
-        { name: 'description', content: 'Auto-generated documentation for @robonen/tools monorepo' },
+        { name: 'description', content: 'Auto-generated documentation for the @robonen/tools monorepo' },
+        { name: 'viewport', content: 'width=device-width, initial-scale=1' },
+        { name: 'theme-color', content: '#ffffff', media: '(prefers-color-scheme: light)' },
+        { name: 'theme-color', content: '#0a0a0a', media: '(prefers-color-scheme: dark)' },
       ],
       htmlAttrs: {
         lang: 'en',
       },
+      script: [
+        {
+          // Set the theme class before first paint to avoid a flash.
+          innerHTML: `(function(){try{var t=localStorage.getItem('docs-theme');var d=t==='dark'||((!t||t==='system')&&matchMedia('(prefers-color-scheme: dark)').matches);document.documentElement.classList.toggle('dark',d);}catch(e){}})();`,
+          tagPosition: 'head',
+        },
+      ],
     },
   },