App closes directly on back button press in webmail tab

[asutoshranjan]

The app closes directly even when a mail is opened inside the web view. Additionally, we want to route the user back to the home page when the back button is pressed at times when the webview is in its initial URL instead of directly closing the app

This may help

1. Handel the back button route with WillPopScope
2. Route back to home page when the webview URL is initial URL

[github-actions]

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