feat(web,a11y): slider accessibility improvements (#8479)

* feat(web,a11y): slider accessibility improvements

* add perceivable focus outline
* label all sliders for screen readers

* chore: add IDs to all settings sliders

* chore: add comment to id prop

* fix: switch to using CSS to add outlines

* fix: reactive sliderId

* fix: bring back the slot

* fix: add aria-describedby for the subtitle

* fix: cleanup css because disabled slider cannot be focused

* fix: add border to the slider when focus is visible

---------

Co-authored-by: Alex Tran <alex.tran1502@gmail.com>

web/src/lib/components/admin-page/settings/logging-settings/logging-settings.svelte

@@ -20,7 +20,13 @@
   <div in:fade={{ duration: 500 }}>
     <form autocomplete="off" on:submit|preventDefault>
       <div class="ml-4 mt-4 flex flex-col gap-4">
-        <SettingSwitch title="ENABLED" {disabled} subtitle="Logging" bind:checked={config.logging.enabled} />
+        <SettingSwitch
+          id="enable-logging"
+          title="ENABLED"
+          {disabled}
+          subtitle="Logging"
+          bind:checked={config.logging.enabled}
+        />
         <SettingSelect
           label="LEVEL"
           desc="When enabled, what log level to use."