fix: add missing global variables to ESLint config

Add fetch and timer functions (setTimeout, setInterval, etc.) as
global variables in ESLint configuration to fix no-undef errors
in scripts.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

eslint.config.js

@@ -17,6 +17,11 @@ export default [
         module: 'readonly',
         require: 'readonly',
         exports: 'writable',
+        fetch: 'readonly',
+        setTimeout: 'readonly',
+        setInterval: 'readonly',
+        clearTimeout: 'readonly',
+        clearInterval: 'readonly',
       },
     },
     rules: {