Finalized the Super admin Components and functionalities with UI fixes

docs/api/API_Registration.md

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+# API Guide
+
+Welcome to the Digital Logbook API documentation. This guide provides an overview of available endpoints and how to use them.
+
+## Table of Contents
+
+- [Authentication](#authentication)
+- [Endpoints](#endpoints)
+  - [Projects](#projects)
+  - [Invitations](#invitations)
+- [Error Handling](#error-handling)
+- [Best Practices](#best-practices)
+
+## Authentication
+
+All API endpoints require authentication via JWT tokens. Include the token in the `Authorization` header:
+
+```
+Authorization: Bearer <your_jwt_token>
+```
+
+## Endpoints
+
+### Projects
+
+For detailed project endpoint documentation, see [API_PROJECTS.md](./API_PROJECTS.md)
+
+**Available Operations:**
+
+- Get all projects
+- Get project by ID
+- Create new project
+- Update project
+- Delete project
+- Manage project allocations
+
+### Invitations
+
+For detailed invitation endpoint documentation, see [API_INVITATIONS.md](./API_INVITATIONS.md)
+
+**Available Operations:**
+
+- Send invitations
+- Validate invitation tokens
+- Accept invitations
+- Resend invitations
+
+## Error Handling
+
+All endpoints return standard HTTP status codes:
+
+| Status | Meaning               |
+| ------ | --------------------- |
+| 200    | Success               |
+| 400    | Bad Request           |
+| 401    | Unauthorized          |
+| 404    | Not Found             |
+| 500    | Internal Server Error |
+
+### Error Response Format
+
+```json
+{
+  "error": "Error description"
+}
+```
+
+## Best Practices
+
+### 1. Request Validation
+
+- Always validate input data before sending requests
+- Check that required fields are present
+- Ensure data types match expected values
+
+### 2. Error Handling
+
+- Implement proper try-catch blocks
+- Handle specific error messages from the API
+- Log errors for debugging
+
+### 3. Performance
+
+- Use pagination for large datasets
+- Cache responses when appropriate
+- Implement request debouncing on the frontend
+
+### 4. Security
+
+- Never expose JWT tokens in logs
+- Always use HTTPS in production
+- Validate tokens on the backend
+- Implement rate limiting on sensitive endpoints
+
+### 5. Testing
+
+- Test all endpoints with valid and invalid data
+- Verify error handling
+- Test edge cases and boundary conditions
+
+## Frontend Integration
+
+When using these APIs in the frontend, consider using:
+
+- **TanStack Query (React Query)** for caching and state management
+- **Custom Hooks** for reusable API logic
+- **Error Boundaries** for graceful error handling
+- **Toast Notifications** for user feedback
+
+### Example Hook Pattern
+
+```typescript
+import { useMutation } from "@tanstack/react-query";
+
+export const useYourMutation = () => {
+  return useMutation({
+    mutationFn: async (payload) => {
+      const response = await fetch("/api/endpoint", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify(payload),
+      });
+
+      if (!response.ok) {
+        throw new Error("Request failed");
+      }
+
+      return response.json();
+    },
+    onSuccess: (data) => {
+      // Handle success
+    },
+    onError: (error) => {
+      // Handle error
+    },
+  });
+};
+```
+
+## Additional Resources
+
+- [Database Schema](../schema/README.md)
+- [Project Endpoints](./API_PROJECTS.md)
+- [Invitation Endpoints](./API_INVITATIONS.md)
+
+---
+
+For questions or issues, please refer to the main [README.md](../../README.md)