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.github/instructions/api.md

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+# Frontend API Instructions
+
+## Scope
+- Applies to API calls in `src/lib/api/api.ts` and feature-level data hooks.
+
+## Rules
+- Keep axios-based API calls centralized in `src/lib/api/api.ts`.
+- Map backend response shapes to frontend-friendly models in hooks or API mappers.
+- Follow existing tickets pattern: `api.ts` + feature hook (`useX`) + presentational components.
+- Use optimistic updates carefully; ensure API failures do not leave inconsistent UI state.
+- Keep request payload keys aligned with backend contract (`section_id`, `position`, etc.).
+
+## Error Handling
+- Surface recoverable errors to the user with clear toast messages.
+- Avoid silent failures for create/update/delete flows.