feat(prompts): add @inquirer/checkbox support

- Add @inquirer/checkbox@4.3.1 as pinned dev dependency
- Create external wrapper at src/external/@inquirer/checkbox.js
- Add checkbox to build externals config for bundling
- Export checkbox prompt with spinner/theme/signal support

Enables multi-select prompts in Socket CLI tools.

Author: jdalton

package.json

@@ -603,6 +603,7 @@
     "@biomejs/biome": "2.2.4",
     "@eslint/compat": "1.4.0",
     "@eslint/js": "9.38.0",
+    "@inquirer/checkbox": "4.3.1",
     "@inquirer/confirm": "5.1.16",
     "@inquirer/input": "4.2.2",
     "@inquirer/password": "4.0.18",

pnpm-lock.yaml

@@ -44,6 +44,7 @@ export const scopedPackages = [
     scope: '@inquirer',
     packages: [
       // Only bundle packages that are in devDependencies
+      'checkbox',
       'confirm',
       'input',
       'password',

scripts/build-externals/config.mjs

@@ -0,0 +1,3 @@
+'use strict'
+
+module.exports = require('@inquirer/checkbox')