fix: add Node.js globals to ESLint config

Add fetch, setInterval, clearInterval, Buffer, setTimeout, clearTimeout
to ESLint globals to prevent no-undef errors for standard Node.js/browser APIs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: vveerrgg

eslint.config.js

@@ -16,7 +16,13 @@ export default [
         console: 'readonly',
         process: 'readonly',
         window: 'readonly',
-        jest: 'readonly'
+        jest: 'readonly',
+        fetch: 'readonly',
+        setInterval: 'readonly',
+        clearInterval: 'readonly',
+        Buffer: 'readonly',
+        setTimeout: 'readonly',
+        clearTimeout: 'readonly'
       }
     },
     plugins: {