feat(ade, onboarding): redesign the setup dialog and the guided tour

[arihantcodes]

Summary

Redesign of the first-run setup dialog (ade/web/src/components/onboarding) and the guided tour page (onboarding/ui) so both read as one system.

Setup dialog

• Frame and stepper. 760×620 with a 200px rail holding a vertical stepper: 24px numbered dots on a hairline that fills as steps complete, a one-line description per step, a check that cross-fades in when a step is done. Finished steps go back on click; the current one carries aria-current="step"; steps ahead are plain text so Tab only stops on things that act. Below the @lg container width the rail becomes a one-row stepper.
• One spacing and surface system. 24px gutter, 56px footer, a close-button strip the body never scrolls under, 12px-cornered pill buttons with semibold labels, pill chips, bordered cards with hairline dividers. Every hover and selected fill uses the console's surface tokens, so each state is the same step in both themes.
• Models. Sign-in commands in a dark terminal block with bash colouring and a copy button. The engine log moved onto the same surface and is no longer a nested scroller.
• Judge. What Judge does up front (three uses, one line each), then a checkbox list that reads as a choice, with the hint saying what to do.
• Ready. The harness template's four example prompts as cards. A click opens a new chat with the message prefilled, the prompt's agent profile selected, and the first model from its priority list that the machine has, with its effort. Served by console::onboarding::prompts when the ADE has it (upstream feat: onboarding feedback — Chromium setup step, pinned response language, ports, and no polling iii-hq/workers#1329), built in otherwise. The guided tour offer stays.
• Fix. compose::add and compose::remove now pass the file the daemon loaded (from compose::list), so a daemon started with --file from another directory no longer fails with "no worker-compose.yaml here".

Guided tour

Same system: a vertical stepper with the open step's content in a card under its title, pill chips for state, the trigger as a disclosure onto a terminal block, grid-track expand/collapse that can reverse midway, the console sans at the dialog's 13px scale. No nested scroll containers.

Verification

• pnpm typecheck, Biome on the onboarding directories, and the onboarding unit tests (64) pass; the full web suite passes apart from two pre-existing flaky cases unrelated to this change (ProviderConfigurationPanel, MermaidDiagram).
• Worker UI build passes typecheck and the strict design-rule lint; the worker's node tests pass.
• Walked all four steps by keyboard in Chromium in both themes and at 390px: fresh open focuses the primary action, Enter advances, Escape closes, no horizontal overflow. Example-prompt cards open a chat with the right text, profile and model. The tour renders the new page live, toggles by keyboard, and shows a focus ring.

Notes

• harness/worker-compose.yaml is intentionally not part of this PR (local wizard-made changes).
• The published onboarding package needs a release for the tour redesign to reach a project that installs it from the registry.
• Upstream iii-hq/workers main has since reworked the same files (feat: providers declare default models and thinking levels; harness and ADE start on them iii-hq/workers#1306, feat: onboarding feedback — Chromium setup step, pinned response language, ports, and no polling iii-hq/workers#1329, feat(ade): offer Decisions by OpenAI and Clef as Judge options in the setup wizard (MOT-5346) iii-hq/workers#1360); a dry-run merge shows conflicts in plan.ts, plan.test.ts, prompts.ts, prompts.test.ts and onboarding/ui/src/page.tsx. This PR targets the fork's main, which it merges cleanly into.

🤖 Generated with Claude Code

[github-actions]

skill-check — worker

0 verified, 82 skipped (no docs/).

Layer	Result
structure	✓
vale	✓
render	✓

Three for three. Nicely done.

[arihantcodes]

Superseded by iii-hq#1367, opened against the main repository.