fix: whats new modal background color

[im-adithya]

Fixes https://github.com/TryGhost/Ghost/issues/21923

Description

Changes the color from a hardcoded value to css variable. (Also removed an unused class + fixed a classname typo)

Checklist

• [x] There's a clear use-case for this code change, explained below
• [x] Commit message has a short title & references relevant issues
• [x] The build will pass (run yarn test:all and yarn lint)

[coderabbitai[bot]]

Walkthrough

The pull request modifies the "What's New?" modal in the Ghost Admin interface by correcting a typographical error in the class names. In the HTML template, the class name is updated from gh-whasnew-modal-title to gh-whatsnew-modal-title. In the CSS file, the class .gh-whasnew-featured-title is removed entirely, and the background property in .gh-whatsnew-modal-footer is changed from a hardcoded value (#fff) to a variable (var(--white)). These changes standardize the naming convention and update the styling, enabling the modal's footer to leverage theming variables, which is critical for proper dark mode rendering.

Assessment against linked issues

Objective	Addressed	Explanation
Ensure the "What's New?" modal footer can adapt to dark mode (#21923)	✅

Possibly related PRs

• TryGhost/Ghost#22070: This PR also involves the correction of class names in both the HTML and CSS for the "What's New?" modal, establishing a direct code-level connection.

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ghost/admin/app/styles/layouts/whatsnew-modal.css

Oops! Something went wrong! :(

ESLint: 8.44.0

Error: Failed to load parser '@babel/eslint-parser' declared in 'ghost/admin/.eslintrc.js': Cannot find module '@babel/eslint-parser' Require stack:

• /ghost/admin/.eslintrc.js at Module._resolveFilename (node:internal/modules/cjs/loader:1248:15) at Function.resolve (node:internal/modules/helpers:145:19) at Object.resolve (/node_modules/@eslint/eslintrc/dist/eslintrc.cjs:2346:46) at ConfigArrayFactory._loadParser (/node_modules/@eslint/eslintrc/dist/eslintrc.cjs:3325:39) at ConfigArrayFactory._normalizeObjectConfigDataBody (/node_modules/@eslint/eslintrc/dist/eslintrc.cjs:3099:43) at _normalizeObjectConfigDataBody.next () at ConfigArrayFactory._normalizeObjectConfigData (/node_modules/@eslint/eslintrc/dist/eslintrc.cjs:3040:20) at _normalizeObjectConfigData.next () at ConfigArrayFactory.loadInDirectory (/node_modules/@eslint/eslintrc/dist/eslintrc.cjs:2886:28) at CascadingConfigArrayFactory._loadConfigInAncestors (/node_modules/@eslint/eslintrc/dist/eslintrc.cjs:3871:46)

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[im-adithya]

@mike182uk can you please have a look :D

[peterzimon]

Duplicate of https://github.com/TryGhost/Ghost/pull/22990/files