# thumbnail-preview-tool Development Guidelines

Auto-generated from all feature plans. Last updated: 2026-01-29

## Active Technologies
- TypeScript 5.9.x (frontend + backend) + React 19.x, Tailwind CSS 4.x, shadcn/ui, Zustand, Playwright MCP (002-youtube-design-preview)
- Browser localStorage (preview persistence), file system (reference screenshots) (002-youtube-design-preview)

- TypeScript 5.x (frontend + backend) (001-google-oauth-auth)

## Project Structure

```text
src/
tests/
```

## Commands

npm test && npm run lint

## Code Style

TypeScript 5.x (frontend + backend): Follow standard conventions

## Recent Changes
- 002-youtube-design-preview: Added TypeScript 5.9.x (frontend + backend) + React 19.x, Tailwind CSS 4.x, shadcn/ui, Zustand, Playwright MCP

- 001-google-oauth-auth: Added TypeScript 5.x (frontend + backend)

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