refactor(routing): Migrate to React Router and simplify component structure

Replaces 'wouter' with 'react-router-dom' to standardize the routing library and resolve dependency conflicts.

Key changes:

- All routing logic, including hooks (useLocation) and components (Link, Routes), now uses 'react-router-dom'.

- The component tree has been simplified by removing the MainContainer component and moving its layout directly into App.tsx.

- The <BrowserRouter> provider is now correctly placed at the application's entry point in main.tsx.

yarn.lock

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