Add dialog for saving patch (web app)

We should add a dialog instead of showing an alert in the browser to send a message to improve UI/UX.

Steps to follow:

  1. Click on File -> Save or Save as
  2. See that an alert box shows up for saving patch.

Current Behaviour: Alert box shows up image

Expected Behaviour: Dialog box should show up instead.

I am starting to work on this issue.

Edited by Paarth Agarwal