better focus Drupal 3618140

Mike Giffordrequested to merge
issue/drupal-3618140:drupal-3618140 into main

This AI generated patch:

  • Adds a 2px gap between focus outlines and component borders.
  • Applies that offset to radios, checkboxes, media-library proxy indicators, and settings labels.
  • Replaces translucent focus colours with light/dark values meeting 3:1 against applicable theme surfaces.
  • Preserves the 4px real outline for Forced Colors.
  • Fixes custom focus colours using the obsolete --gin-color-focus token.
  • Updates generated CSS.

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