Fix skip link underline being removed when global styles are enabled

[querkmachine]

Fixes #4930.

Changes

• Adds the govuk-link-decoration mixin (which sets the text-decoration, text-decoration-thickness and text-decoration-offset properties) to the list of styles re-added to the Skip link component when global styles are enabled.
• Update changelog.

Thoughts

• Simply re-adding the underline with text-decoration: underline doesn't have the desired effect, as the text-decoration: none inherited from the global styles also resets the thickness and offset properties. We do need all three.

[github-actions]

📋 Stats

File sizes

File	Size
dist/govuk-frontend-development.min.css	113.24 KiB
dist/govuk-frontend-development.min.js	42.21 KiB
packages/govuk-frontend/dist/govuk/all.bundle.js	87.21 KiB
packages/govuk-frontend/dist/govuk/all.bundle.mjs	81.95 KiB
packages/govuk-frontend/dist/govuk/all.mjs	4.17 KiB
packages/govuk-frontend/dist/govuk/govuk-frontend-component.mjs	359 B
packages/govuk-frontend/dist/govuk/govuk-frontend.min.css	113.23 KiB
packages/govuk-frontend/dist/govuk/govuk-frontend.min.js	42.2 KiB
packages/govuk-frontend/dist/govuk/i18n.mjs	5.55 KiB

Modules

File	Size (bundled)	Size (minified)
all.mjs	77.67 KiB	40.19 KiB
accordion.mjs	22.71 KiB	12.85 KiB
button.mjs	5.98 KiB	2.69 KiB
character-count.mjs	22.4 KiB	9.92 KiB
checkboxes.mjs	5.83 KiB	2.83 KiB
error-summary.mjs	7.89 KiB	3.46 KiB
exit-this-page.mjs	17.1 KiB	9.26 KiB
header.mjs	4.46 KiB	2.6 KiB
notification-banner.mjs	6.26 KiB	2.62 KiB
password-input.mjs	15.15 KiB	7.25 KiB
radios.mjs	4.83 KiB	2.38 KiB
skip-link.mjs	4.39 KiB	2.18 KiB
tabs.mjs	10.13 KiB	6.11 KiB

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Action run for bbc74c6

[github-actions]

Other changes to npm package

diff --git a/packages/govuk-frontend/dist/govuk/components/skip-link/_index.scss b/packages/govuk-frontend/dist/govuk/components/skip-link/_index.scss
index 9ca6fde4b..9c4803617 100644
--- a/packages/govuk-frontend/dist/govuk/components/skip-link/_index.scss
+++ b/packages/govuk-frontend/dist/govuk/components/skip-link/_index.scss
@@ -27,6 +27,7 @@
 
       // Undo unwanted changes when global styles are enabled
       @if $govuk-global-styles {
+        @include govuk-link-decoration;
         box-shadow: none;
       }
     }

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Action run for bbc74c6

[romaricpascal]

Works neatly 🙌🏻