updated stop generating button's cursor from text to pointer

[theriyasharma24]

Fixes #1323

Motivation and Context

Currently, when hovering over the Stop generating button, the cursor appears as a text cursor (cursor: text) instead of a pointer (cursor: pointer). Since the button is clickable, this behavior is misleading and may suggest that the button is meant for text input rather than an interactive action.

Issue Snapshot-

Description

I have updated the button's CSS to explicitly set cursor: pointer. This change contributes to better user experience across the UI.

After My Changes Snapshot-

Contribution Checklist

• I have built and tested the code locally and in a deployed app
• For frontend changes, I have pulled the latest code from main, built the frontend, and committed all static files.
• This is a change for all users of this app. No code or asset is specific to my use case or my organization.
• I didn't break any existing functionality 😄

[theriyasharma24]

Hello @sarah-widder, @anushree1808
Can you please review this PR? Thank you!