describe-changes@v1: with concatenate mode: append

✨ PR Description

1. Problem & Context

Integrate Prettier code formatter across the codebase to enforce consistent code style and reduce lint/format friction. Replaces manual eslint-based formatting with Prettier's opinionated, deterministic approach.

2. What Changed (Where)

• Config & tooling: Added .prettierrc, updated package.json (Prettier + eslint-config-prettier + eslint-plugin-prettier), updated .eslintrc.js to remove conflicting rules and extend Prettier config
• TypeScript/React files (60+ files in modules/admin-home, dev/js, tests/playwright): Reformatted spacing, arrow functions, brackets, template literals, JSX attributes
• Build config (webpack.config.js): Improved readability with expanded multi-line declarations

3. How It Works

Prettier enforces formatting via .prettierrc config (tabs, 80-char width, always arrow parens, bracket spacing). ESLint integration delegates formatting concerns to Prettier via eslint-plugin-prettier and eslint-config-prettier (disables conflicting ESLint rules). npm run format now triggers Prettier instead of manual lint-fix cycles.

4. Risks

Low risk—purely formatting, no logic changes. Only concern: Prettier's 80-char line width may force awkward breaks in long strings/URLs (e.g., test selectors), but this improves consistency at minor verbosity cost. Existing tests/functionality unaffected.

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