Improve Quick Draft success highlight visibility and styling

[KarunyaChavan]

This PR fixes the Quick Draft success highlight on the Dashboard. When a new draft is created via the Quick Draft widget, it gets highlighted for one second with an old yellow color (#fffbe5) that is barely visible and doesn't match modern admin colors. This fix replaces the yellow with a green background and improves the padding so the highlight box looks cleaner.

Trac ticket: https://core.trac.wordpress.org/ticket/65539

What Changes?

• src/js/_enqueues/wp/dashboard.js : Replaced inline .css() calls with addClass('is-highlighted') / removeClass('is-highlighted'), separating presentation from logic.

• src/wp-admin/css/dashboard.css: Added padding: 0.5em with offsetting negative margins on .drafts li to prevent layout shift, a CSS transition for a smooth fade-out, and a new .is-highlighted rule with a green background (#cceebb) that snaps on instantly.

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