- Widen the comments/aside panel from 350 to 420 (~20% wider)
- Remove double padding around the panel: AppShell.Aside p="md"->"sm"
and inner Box p="md"->p={0}; reduce header-to-tabs gap mb="md"->"sm"
- Reduce empty space below the add-comment input (paddingBottom 25->10),
align the avatar with the input box (marginTop 10->2) and re-anchor the
send button (bottom 30->15)
- Pull the timestamp closer to the nickname via tighter line-height
(lh 1.2 on the name, 1.1 on the "… ago" text)