chore(deps): update css-loader, remove redundant deps

[avivkeller]

Ref: #7725

This PR does two things:

1. It updates css-loader to the next major
2. It removes postcss dependencies that are bundled with Next.js, since they do not serve a purpose

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[Copilot]

Pull Request Overview

This PR updates the version of css-loader to its next major release and removes redundant postcss-related dependencies that are bundled with Next.js.

• Updated css-loader version in packages/ui-components/package.json
• Adjusted Storybook configuration in packages/ui-components/.storybook/main.ts to match the new css-loader settings and removed explicit postcss-loader configuration
• Removed unneeded postcss and postcss-loader entries from apps/site/package.json

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
packages/ui-components/package.json	Upgraded css-loader dependency to ~7.1.2
packages/ui-components/.storybook/main.ts	Updated css-loader options and simplified postcss-loader configuration
apps/site/package.json	Removed redundant postcss dependencies bundled with Next.js

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

Comments suppressed due to low confidence (1)

packages/ui-components/.storybook/main.ts:27

• The removal of the custom implementation for 'postcss-loader' (previously using require.resolve('postcss')) means the default configuration will be used. Please confirm that these defaults align with your intended postcss behavior within Storybook.

options: { esModule: false, importLoaders: 1, },

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.84%. Comparing base (10a07a1) to head (3a1e31a).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7739   +/-   ##
=======================================
  Coverage   74.84%   74.84%           
=======================================
  Files          98       98           
  Lines        7888     7888           
  Branches      200      200           
=======================================
  Hits         5904     5904           
  Misses       1983     1983           
  Partials        1        1           

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[github-actions]

Lighthouse Results

URL	Performance	Accessibility	Best Practices	SEO	Report
/en	🟢 99	🟢 100	🟢 100	🟢 91	🔗
/en/about	🟢 100	🟢 100	🟢 100	🟢 91	🔗
/en/about/previous-releases	🟢 99	🟢 100	🟢 100	🟠 83	🔗
/en/download	🟢 98	🟢 100	🟢 100	🟢 91	🔗
/en/blog	🟢 100	🟢 100	🟢 96	🟢 92	🔗