feat: create ErrorBoundary component with error handling UI and reload and functionality.

[Shreyanshi210205]

Description

This PR introduces a reusable ErrorBoundary component to catch and handle unexpected runtime errors in the React UI.
It ensures that the application displays a friendly fallback screen instead of crashing entirely when an error occurs in the component tree.

Semver Changes

• Patch (bug fix, no new features)
• Minor (new features, no breaking changes)
• Major (breaking changes)

Issues

#20

Checklist

• I have read the Contributing Guidelines.

[Copilot]

Pull Request Overview

This PR adds error boundary functionality to the React application to gracefully handle runtime errors. The ErrorBoundary component provides a fallback UI when errors occur and wraps the entire application.

• Implemented a new ErrorBoundary class component with fallback UI and error recovery options
• Integrated ErrorBoundary at the root level of the App component to catch errors across the entire application

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
frontend/src/components/ErrorBoundary.tsx	New component implementing React error boundary with customizable fallback UI, reload and dismiss actions
frontend/src/App.tsx	Wrapped application with ErrorBoundary component to provide error handling at the root level

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