fix focus to use default focus to leave the browser's default focus sufficiently contrasted on all interactive elements

[cedric07]

Suite à de nombreux retours sur des audits a11y, il vaut mieux garder le focus natif navigateur qui automatiquement va garder son anneau de focus suffisamment contrasté par rapport à la couleur de fond (il faut un contraste de minimum 3:1). Webkit utilise par exemple webkit-focus-ring-color

Le fait d'avoir un currentColor pose souvent des soucis, par exemple dans le cas d'un élément blanc sur fond de couleur, donc le focus n'est pas visible, et il faut penser à apporter des surcharges au cas par cas. et en plus s'assurer que le contraste soit suffisant.

C'est typiquement les soucis qu'on a sur plusieurs projets.

On garde également le focus uniquement sur le lien présent dans un card et non la card complète, ce qui apporte plus de contexte et aussi parfois on a des taxo qui sont cliquables dans les cards et donc le focus n'est pas visible.

On se contente juste de jouer avec l'offset et la taille de l'outline au besoin

[sourcery-ai]

Reviewer's Guide

This PR strips out manual focus styling across select components, SEO utilities, audio controls, skip links, and global focus rules—opting instead for the browser’s native focus ring to ensure consistent, high-contrast outlines.

Class diagram for removed custom focus styles in SCSS utilities and components

classDiagram
    class m-select-custom {
      /* Focus styles removed: color, border-color, outline, box-shadow */
    }
    class seo-container {
      /* No longer extends focus-seo-container */
    }
    class focus-seo-container {
      /* Removed: outline and outline-offset for :focus-visible */
      /* Removed: outline: none for *:focus */
    }
    class audio {
      /* Removed: outline and outline-offset for :focus */
    }
    class skip-links {
      /* Removed: outline-offset for :focus */
    }
    class global_focus {
      /* outline-offset for :focus-visible changed from .5rem to .2rem */
    }

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File-Level Changes

Change	Details	Files
Removed custom focus styling from the custom select component	Deleted &:focus color and border adjustments Eliminated box-shadow focus rings Removed option outline reset	src/scss/02-tools/_m-select-custom.scss
Discarded the SEO focus placeholder and its extension	Removed %focus-seo-container rules Deleted @extend in %seo-container	src/scss/04-utilities/_seo.scss
Eliminated manual focus outlines on audio controls	Dropped &:focus outline and outline-offset on media controls	src/scss/06-blocks/core/_audio.scss
Removed custom focus-offset from skip links	Deleted &:focus outline-offset override	src/scss/05-components/_skip-links.scss
Adjusted global focus-visible offset to be minimal	Changed outline-offset from .5rem to .2rem	src/scss/04-utilities/_focus.scss

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[sourcery-ai]

Hey @cedric07 - I've reviewed your changes and they look great!

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