✨ Add GitHub Copilot instructions for repository

[Copilot]

Overview

This PR adds a comprehensive .github/copilot-instructions.md file to configure GitHub Copilot coding agent for this repository, following the best practices documented at https://gh.io/copilot-coding-agent-tips.

What's Included

The instructions file provides GitHub Copilot with detailed context about the project to improve code suggestions and assistance:

Project Context

• Overview: React Seat Toolkit as a UI library for designing and rendering seat layouts
• Technology Stack: Bun runtime, TypeScript, React, Redux Toolkit, Tailwind CSS, Radix UI, and more
• Development Tools: Storybook, ESLint, Prettier, Lefthook

Code Standards

• ESLint & Prettier configuration: Print width, trailing commas, and import ordering rules
• Import order: Specific ordering from React imports → React packages → Redux packages → Third-party → Internal (@/*) → Relative
• TypeScript setup: Path aliases (@/* for src directory), JSX configuration

Development Workflow

• Commands: bun install, bun storybook, bun build, bun lint, bun format
• Build process: ESM, CJS, and slim bundle generation with automatic type and CSS building
• Project structure: Detailed directory organization and purpose

Conventions

• Commits: Conventional commits format (feat, fix, docs, etc.)
• Pull Requests: Labeling, descriptions, screenshots for UI changes, documentation updates
• Dependencies: Core libraries to use (Radix UI, D3, lodash, Lucide React, etc.)

Best Practices

• Security guidelines (no secrets in code)
• React patterns (functional components with hooks)
• TypeScript usage guidelines
• Library export formats and Next.js compatibility notes

Benefits

This configuration will help GitHub Copilot:

• Generate code that follows the project's style guidelines
• Suggest appropriate dependencies that are already in use
• Understand the build and development workflow
• Follow established conventions for commits and PRs
• Provide context-aware assistance for developers

Related

Closes #[issue_number]

Original prompt

---

This section details on the original issue you should resolve

<issue_title>✨ Set up Copilot instructions</issue_title>
<issue_description>Configure instructions for this repository as documented in Best practices for Copilot coding agent in your repository.

</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #29

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✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.