chore(design-system): change ESLint invocation and ignore `node_modules`

[batchu5]

This PR:

• Modifies the Design System's lint command to eslint . --ext .ts --ext .tsx --ext .js --ext .jsx to prevent parsing errors on Windows PowerShell (which treats commas as array separators, passing incorrect arguments to ESLint) and to ensure cross-shell compatibility.

• Explicitly adds the directory node_modules to the Design System's .eslintignore because the default ignore pattern is not honored.