A title-row toggle redraws the composition bar as one band per context
item — the system prompt, every tool schema, every surface message — in
prompt order (the header prefix first, then the message flow by seq),
the order the model reads the context and the order items joined it.
The header epoch's own seq is bookkeeping (dsh logs request/header at
dispatch of the first request using it), never an ordering key: a
mid-session refresh must not park the schemas behind the tool results
they describe.
Bands floor at 0.35% of the occupied region so a tiny item stays a
hoverable filament (tooltips still report true shares); hovering names
the item with its time, a mirrored category hover lights the category's
bands as a group, and clicking a band opens its category + element row
below, scrolling it into view.