Add CLAUDE.md — AI assistant guide for ferienhaus project

[ambajorat]

Summary

Added comprehensive documentation (CLAUDE.md) to guide AI assistants and developers working on the BarrierefRei Reisen project. This file serves as a single source of truth for project structure, conventions, and architecture.

Key Changes

• Project Overview: Documented the purpose (accessible vacation home finder), tech stack (React 19, Vite 7, plain CSS), and frontend-only nature of the application
• Development Setup: Listed all npm scripts and noted the absence of test configuration
• Repository Structure: Provided a complete directory tree with descriptions of each file and folder
• Architecture & Data Flow:
  • Documented all React state variables and their purposes
  • Defined the complete data shape for vacation home objects
  • Listed all accessibility feature keys and their categories
• Component API: Specified props and callbacks for FilterPanel, HausCard, and CompareTable components
• Conventions: Clarified language (German), JavaScript/JSX patterns (ES Modules, hooks only, no TypeScript), CSS approach (custom properties, responsive breakpoints, no preprocessors), and ESLint configuration
• Data Management: Explained how to add new vacation homes and accessibility features
• Known Limitations: Listed what is not yet implemented (tests, TypeScript, backend, routing, etc.)

Notable Details

• Emphasizes the German-language nature of the entire application
• Documents the use of useMemo for filtering/sorting without external state libraries
• Clarifies ESLint flat config (v9) rules, particularly the handling of unused variables
• Provides clear guidance on CSS custom properties and responsive design patterns
• Includes the default filter configuration for reference

https://claude.ai/code/session_01AvPceG5Uhrh7miYF36fes3