web/components: give the textarea a floor instead of a ceiling
max-h-64 capped the field; min-h-64 gives it a comfortable starting height and
lets it grow. the text inset also moves from the wrapper onto the textarea, so
the scrollbar and the resize handle sit flush against the border rather than
floating inside the wrapper's padding — the icon slots and the loading spinner
now carry their own inset instead.
Signed-off-by: eti <eti@eti.tf>