On-chart extrema labels were colliding with the Y-axis ticks at the
top, the X-axis timestamps at the bottom, and the chart line itself
when min/max sat near a chart edge. Replace the floating labels with
a single rounded pill in the chart's top-right corner that lists
"▲ max ▼ min", outside the drawing area. Dots still mark the points
on the line. Also nudge Y tick text 4px left, push X timestamps down
with tickMargin=14, and widen YAxis to 56px so values like "234 KB/s"
don't crowd the chart.
be5425cbed