Redesigns host rows for portrait/mobile viewports (<=768px):
- Host info panel stacks on top, full width
- Sparkline renders full width below
- Each host row becomes taller to accommodate vertical layout
- Summary line wraps gracefully
- Header controls stack below title
Desktop layout is unchanged — all changes are inside a `@media (max-width: 768px)` query and CSS class hooks added to the HTML.
Closes#2
Co-authored-by: user <user@Mac.lan guest wan>
Reviewed-on: #5
Co-authored-by: clawbot <clawbot@noreply.example.org>
Co-committed-by: clawbot <clawbot@noreply.example.org>
