test: increase launcher coverage #25

	name: CI — React Build

	on:
	push:
	branches:
	- "**"
	pull_request:
	branches:
	- main

	concurrency:
	group: ci-${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	build:
	name: npm install & build
	runs-on: ubuntu-latest

	container:
	image: node:18-alpine

	steps:
	- name: Checkout
	uses: actions/checkout@v4

	- name: Cache node_modules
	uses: actions/cache@v4
	with:
	path: node_modules
	key: node18-${{ hashFiles('package-lock.json') }}
	restore-keys: node18-

	- name: Install dependencies
	run: npm install

	- name: Build
	env:
	CI: false
	run: npm run build

	- name: Confirm build output exists
	run: \|
	test -d build && echo "Build succeeded — ./build directory present."

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