Implement Todo application and update root routing

[steve8708]

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Summary
This PR introduces a new Todo application feature and updates the application's routing structure to serve the Todo app at the root path, relocating the CRM dashboard.

Problem
The application required a task management interface to allow users to track and manage to-do items. Additionally, the root path was previously dedicated to the CRM dashboard, needing reconfiguration to accommodate the new feature.

Solution
Implemented a fully functional TodoApp component using Material UI and updated App.tsx to establish the Todo app as the main landing page while preserving the CRM functionality under a specific route.

Key Changes

• New Feature: Created TodoApp with capabilities to add, delete, toggle completion status, and filter tasks (All/Active/Completed).
• Routing: Updated react-router configuration to serve TodoApp at / and moved CrmDashboard to /crm/*.
• UI/UX: Utilized Material UI components (Paper, List, Chips) for a responsive and clean design, wrapped in the shared AppTheme.

Files Changed

• src/App.tsx: Modified route definitions to set the Todo app as the home page and move the CRM dashboard to /crm.
• src/todo/TodoApp.tsx: Added the complete implementation of the Todo application logic and UI.

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