Cook Up the Perfect Recipe App

Build a recipe organiser for a shared household. Store ingredients, servings, preparation steps and dietary tags; turn a weekly meal plan into a combined shopping list.

Include these capabilities:
- Recipe cards with photos and ratings
- Step-by-step cooking instructions
- Ingredient lists with serving size adjustment
- Meal planning calendar
- Auto-generated shopping lists

Build the complete working project with its routes, data model and interactions. For saved or private data, implement persistence, authentication and server-side permissions. Keep API credentials on the server. For external services, document the required setup and use test mode until real accounts are connected. Do not present a simulated integration as a completed live connection.

Make the interface responsive, with accessible labels, keyboard navigation and visible focus. Include loading, empty, validation and error states. Use clearly labelled sample data, never invented customer testimonials or results. Choose a visual direction suited to this project and keep typography, spacing and controls consistent. Explain how to run, test, export and deploy the source.

Verify this end-to-end flow:
Double a recipe's servings and add it to a meal plan. Verify ingredient quantities and merged shopping items, including different measurement units.