usePlayback drives one global round on a rAF timer: 700 ms per round at
1x, speed pill cycling 0.5/1/2, play-once autoplay after the first load,
no looping; at the final round the play button becomes replay. Under
prefers-reduced-motion there is no autoplay, the page settles on the
final round, and the cadence slows to 1000 ms.
The PlayerBar is the mockup's centered pill with a native range
scrubber (one tick per round, aria-valuetext, seeking pauses) and the
global keyboard map: Space toggles, arrows step, Home/End jump; text
inputs and native control handling are left alone. A single polite live
region announces run updates, pauses, scrub releases, and the final
state.
Nodes reached in the current round pop in (scale 0.6 to 1, 250 ms
ease-out) with a small deterministic stagger so each round reads as a
wave. Per Justin's feedback the panel percentage and reached count now
follow the playhead instead of sitting on the final outcome; the hero
keeps the final numbers, since its sentence claims outcomes.
The milestone 2 parity page becomes the spec's dashboard: app bar with
wordmark, disclaimer badge and About popover, theme toggle (persisted,
defaults to prefers-color-scheme, applied pre-mount to avoid a flash),
hero with the preset narrative and live toned percentages, scenario
toolbar, panel cards with skeleton loading and dim-while-refreshing,
legend, and footer. ComparisonTable evolves into the collapsed
ResultsTable (test moved along, plus a formatPct rounding case).
NetworkView renders the real topology with the spec's shape encodings.
The layout is seeded d3-force (mulberry32 random source, seeded initial
positions, 300 synchronous ticks, cached per graph hash); anisotropic
forceX/forceY pulls settle the cloud into the wide card shape so the
fit stays uniform-scale and the spacing organic. Justin asked for a
taller network area (380x230) and a reading caption under the legend;
the caption is study copy, so StudyPreset gains a readingCaption field.
Slices still to come keep their controls visibly parked: Export and the
panel kebab render disabled until slices 11 and 7.
