Outline for .active buttons in Windows High Contrast

[sabernhardt]

• Reverts r62467 to remove pseudo-element.
• Adds a transparent outline to the .active buttons, with a negative outline offset.
• Increases the width of the outline for the focus state.

Trac 65153

Use of AI Tools: none

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[github-actions]

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[github-actions]

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[github-actions]

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[sabernhardt]

Screenshots

Image alignment options in the Classic Editor image replacement dialog

Left button is selected and has focus:

Left button is selected, but the Center button has focus:

Permalink Settings custom tags

Each screenshot shows the year and month number buttons selected, and two screenshots also have the post name selected.

Post name button is selected and has focus:

Post name button is selected, but the category button has focus:

Post name button is not selected, but it has focus:

Publish Options button in the Customizer

Publish Options button is selected and has focus:

Publish Options button is selected, but without the focus state:

[apermo]

LGTM

[t-hamano]

Thanks for the PR. This PR works well and does not affect other button variations or modes other than the default contrast mode.