Introduces a uniform indicator of focus for all editable items in the composer (inputs, select kit, textarea), see screenshots for before/after comparisons.
Title field focus when creating a new topic
Textarea focus (the “Before” screenshot is focused on the textarea, but there is no indicator of focus)
Notice the double border/outline in the before state, replaced with border color change only after
This PR also disables a default iOS style that looks like flash of background color when setting focus on inputs/textareas.