The trend card gains a title-adjacent Duration toggle: every request's
step active time (`activeMs`) drawn as a curve over the bars, read off
a right-hand quartile axis; turn granularity sums the turn's steps, and
a bar without the figure breaks the line instead of faking a point.
The fold stamps it at `step/end` onto the step's committed request
record: the whole step window (the model call plus its tool runs, per
the agent-loop's in-step `executeToolCalls`) minus the step's user
waits — approval decision intervals (`approval/asked` →
`approval/decided`, a crash-dangling pair closing at the step's own
end) and `ask_user_question` answer windows (the tool's body is the
wait itself, in both the blocking and the timed schema's foreground
phase). Overlapping waits price their clamped union, never twice.
The wire field is additive-optional and bumps the timeline projection's
stateVersion (25 → 26): requests already folded can never gain the
figure later, so cached rows refold from the durable log on upgrade.
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