[osolmaz]

Summary

The WikiRace part of the viewer showed only a row of article names, so a race was hard to follow.
Now it draws the route so far and each step's branches, with the model's probability for each, in Wikipedia's look.
Each choice of a pick now carries its type in the viewer, so the part can tell links, sections and giving up apart.

What Changed

The part follows the chess part's pattern: plain browser modules that the page joins into one script, and one stylesheet. It adds no dependency.

• Drawing (examples/wikirace/src/web/route.ts):
  • The head shows the start, the target as a link, the hops so far, and a status: racing, reached, gave up, dead end, step limit or failed.
  • The route at the left shows each article like a stop of a train line, the current one marked and the target apart.
  • The branches at the right show the eight likeliest links, sections and giving up of the step. Each has a bar and a curve whose width follows the probability, and the picked one is always among them. Before the model answers, they are in the article's order.
• Data (data.ts): reads the race from a state and the branches from a step's pick.
• Steps list (part.ts): each step's destination and probability; each entry opens its step.
• Styles (wikirace.css): Wikipedia's light colors, and its night colors under prefers-color-scheme: dark, as CSS variables. Text has at least 4.5:1 contrast. Motion stops under prefers-reduced-motion. A container query drops the curves when the drawing is narrow, so a phone has no sideways scroll.
• Viewer: FrameChoice gains type, read from the pick's facts; null for a choice question that is no pick.
• Domain: a section's choice keeps { section, links } as its data.

Testing

All tests use the fake decider and a fake wiki; no model was called in the tests.

• pnpm check at the root passes. Tests: root 71, viewer 39, chess 75, rubric-judge 49, WikiRace 26 (6 new page tests).
• I looked at two real Jev races (DNA to Manipuri pony, Rubber duck to Moon) saved with view --html. I took headless-Chrome screenshots at 1440x900 in light and dark, and at 390x844.

Risks

The risk is low: the change is limited to one example's part and one new field in the viewer's frames.

• The view state (the open step) is still not in the URL. That is a change of the viewer for all domains, so it is not in this PR.