Reading a day's volume meant hovering every column or interpolating between
the left rail's quarters. Each blue bar now carries its own figure on its
top edge, so the common case reads straight off the chart; a day with no
tokens prints nothing, since there is nothing to say.
The label is a child of its bar rather than positioned against the column,
so it rides the bar's height without a second source of truth for where that
top is. The gridlines move into the bars' own box for the same reason: with
headroom taken above the plot, `bottom: N%` still reads the bar scale, so the
822.1M line keeps marking the 822.1M bar instead of drifting by the headroom.
Measured across ten pane widths: the labels overlap below a ~30px column, so
they fold out under the same 400px container query the day strip already
uses — the hover tip carries the exact figure there, and keeps doing so
everywhere else.
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