fix: Add margin to "View comparison" button and fix "Use custom version" button color issue #9905
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What this PR does / why we need it?
This PR adds margin to the "View comparison" button on the App upgrade page to improve visual layout, and fixes the color issue of the "Use custom version" button on the comparison view.
old:

new:

Summary of your change
Added spacing (margin) to the "View comparison" button.
Fixed the button color issue for "Use custom version" on the comparison page, ensuring it behaves correctly on hover and click.
Please indicate you've done the following:
UI-only fix.
Not applicable (UI-only fix).