Add prettier

[martincostello]

Install prettier and run prettier on the JavaScript code.

[Copilot]

Pull Request Overview

Adds Prettier code formatting to the JavaScript codebase with configuration and CI integration. This standardizes code formatting across the project and ensures consistent style enforcement.

• Installs Prettier as a dev dependency with custom configuration
• Formats all existing JavaScript files according to the new style rules
• Adds npm scripts for formatting and format checking
• Integrates format checking into the CI workflow

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
package.json	Adds Prettier dependency, npm scripts, and configuration
test/test-app.js	Reformats test file according to Prettier rules
generators/app/index.js	Reformats generator code according to Prettier rules
.prettierignore	Excludes build artifacts from formatting
.github/workflows/build.yml	Adds format check step to CI pipeline
.editorconfig	Reorganizes properties alphabetically

Comments suppressed due to low confidence (1)

package.json:44

• Prettier version 3.6.2 does not exist. The latest stable version is 3.3.3. Consider using a valid version like "^3.3.3" or "^3.0.0".

    "prettier": "3.6.2",