# Project Rules

## Testing Policy
- **Mandatory Tests**: All new features and bug fixes must be accompanied by tests.
- **Unit/Integration Tests**: Use **Vitest** for testing utilities, hooks, and components.
- **E2E Tests**: Use **Playwright** for critical user flows (auth, core features).
- **Coverage**: Aim for high coverage on business logic and critical paths.

## Tech Stack
- **Framework**: Next.js 15 (App Router)
- **Language**: TypeScript
- **Styling**: Tailwind CSS
- **Database**: PostgreSQL with Drizzle ORM
- **State Management**: React Query

## Code Style
- **Functional Components**: Use arrow functions for components.
- **Types**: strict TypeScript usage (avoid `any`).
- **Imports**: Use absolute imports (`@/...`).