detailed-view: Add a "sum total" line at the top of the table.

[michaelwoerister]

It would be helpful to have a line at the top of the table that shows the sum of the lines below, i.e. the total time spent in query providers/functions, the total number of query invocations, the total time spent in loading things from the incr. comp. cache, etc.

This is something that might be good to have to summarize in general. cc @wesleywiser

[michaelwoerister]

@Mark-Simulacrum Could you somehow visually highlight the totals line? E.g. by making it bold or giving it a different background color.

[Mark-Simulacrum]

We do italicize it today, I can try bolding it. Maybe adding an empty line after it would be good... but that seems pretty 'odd' too.

[wesleywiser]

We could also make the background slightly darker:

#primary-table > tr:nth-child(1) {
  background-color: #EEE;
}