[1.x] Ensure first-party CSS is not overriden

[timacdonald]

When a 3rd party card adds CSS it currently overrides existing CSS.

This sounds like a good thing and what we want, however due to the nature of Tailwind + the cascade, unwanted styling occurs.

For example, imagine a 3rd party card that uses the block class in Tailwind.

Because its .block { display: block } appears later in the order it will override undo some styling in the Pulse dashboard.

<button class="block dark:hidden">

This button will now always be visible.

[github-actions]

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