A click inside a DNA bar hit-tests the same pointer-to-band mapping the
hover uses and lifts (bar seq, band) to the view, which forwards it
through the browser's one-shot reveal bridge: the browser switches off
the live surface to the bar's step, opens the item's category and
element row, and scrolls it into view. The bar's own click still pins
the step in the detail panel, and both land on the same seq.
The nodeFocus bridge generalizes from message-only (seq) to the band
keys both DNA surfaces share — 'sys' (system prompt), 'tool:<name>'
(a tool schema), 'n<seq>' (a message) — so header bands and message
nodes reveal through one path, and the step-brief / file-activity
locates convert to the same keys. The reveal now also clears the row
lens, so a stale filter can no longer hide the revealed row (the
brief flow had the same latent trap).
DnaBar's hit-test becomes a total function: the first visible band
starts at off 0 (leading zero-token bands advance nothing) and the
pointer fraction clamps into [0, 1], so a hit always exists.
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