Migrate frontend from Create React App to Vite (toolchain + env updates)

[digiguru]

Motivation

• Remove the unmaintained react-scripts toolchain and its pinned transitive dependencies to reduce security advisory exposure and enable a maintained build/test stack.
• Standardize environment variables for Vite by moving to VITE_* names so runtime configuration works with the new toolchain.

Description

• Replaced CRA wiring with Vite by removing react-scripts and adding vite, @vitejs/plugin-react, and vitest, and updated package.json scripts to start, build, preview, test, and test:watch that invoke Vite/Vitest via vite and vitest commands.
• Updated runtime env usage in src/App.js from process.env.REACT_APP_SERVER_HOSTNAME to import.meta.env.VITE_SERVER_HOSTNAME and renamed .env entries to VITE_SERVER_HOSTNAME.
• Added vite.config.js and a Vite-compatible index.html, moved testing/dev-only libraries into devDependencies, and removed CRA-specific files and configs.
• Added SECURITY_REMEDIATION_ROUTINES.md documenting recommended remediation steps (overrides and migration strategy) and updated README.md to reflect the Vite-based workflow and environment variable usage.

Testing

• No automated tests were executed as part of this rollout; the change includes test runner configuration for Vitest (test/test:watch) and the repository should run npm run build and npm test in CI to validate the migration.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
image-game-client	Error		Mar 1, 2026 3:12pm