fix(ui): converge copy, focus/motion tokens and limit encodings

[obvious-autobuild]

Why

The task-mode IA rework left three convergence debts from the audit: lessons and copy still carried old surface names in three places, the stylesheet had a corrupted tail (a stray auto; } fragment plus duplicated rules from a sibling merge), one hardcoded focus-ring override bypassed the --focus-ring token, no prefers-reduced-motion support existed, and "distance to a limit" was still rendered four times on one screen (gauges, limits strip, strip value color, and the insight prose restating the numbers). This PR settles the copy/a11y/redundancy lane of the release plan (V7/V9 hygiene) without removing any capability.

What

Three commits, web/-only (plus web/lessons.json), no backend changes:

1. chore(copy) — finish the surface-label sweep. The sibling PRs already renamed the surfaces in lessons 0.2/0.3/4.8/7.1/8.1; three stragglers remained: two "sandbox" comments (figures.js preset note, guide.js lab-help note) and one user-facing string (the agent's protocol-accept confirmation now says "fills the Explore form").
2. feat(a11y) — one focus token, reduced motion. Repairs the style.css tail; drops the one hardcoded .entry-action a:focus-visible override so every interactive element shares the --focus-ring token; adds @media (prefers-reduced-motion: reduce) collapsing the two orientation tweens (gauge bars, spotlight dim); the two JS smooth scrolls (guide.js spotlight, catalog panel jump) gate on the same query at call sites.
3. fix(redundancy) — limit proximity at most twice. The insight paragraph now names which limit is closest and points at the gauges and the limits strip instead of restating their numbers a third time. Lesson 5.5, which described the old prose, drops "and when" to match. No renumbering, no re-anchoring.

Deliberately kept: the window.FusionLab.sandbox API namespace and the lessons' legacy "tab": "sandbox"/"db" directives (the guide contract tests/test_guide.py pins, mapped by workspaces.js LEGACY); the W_kJ field in the fusionlab:slice event detail (same contract — user-facing surfaces all show MJ). The 3D auto-orbit and figure jitter are render-loop motion outside this PR's CSS-token scope — flagged for the release audit, not changed.

Acceptance criteria

• V7 guided walkthrough — lesson 1 loads, NEXT advances to lesson 2 with spotlight and task card; Lab-mode "?" panel help opens the mapped lesson (captured)
• V9 naming/units greps — zero database in web/; zero user-facing kJ (only the W_kJ event-contract field); remaining "sandbox" words are contract identifiers only
• V1 gates — uv run pytest -q 352 passed, 1 skipped; uv run ruff check clean; uv run mypy fusionlab clean
• ARIA tab semantics finalized (verified): tablist/tab/tabpanel roles, aria-controls wiring to the three workspace sections, router-synced aria-selected with roving tabindex and arrow-key navigation — evidenced by the accessibility tree in the captures
• Reduced motion verified functionally under emulated preference: gauge-bar computed transition becomes none, matchMedia gate returns true

Evidence

Captured with agent-browser against the tested head SHA 9cef3e0 (app served from this branch, Q≈9.2 sanity pass):

• tc-1-lesson-1-start.png / tc-1-lesson-2-next.png / tc-1-lesson-walk.webm — guided walkthrough
• tc-2-panel-help-open.png — Lab "?" on the Equilibrium panel opens lesson 4.1
• tc-3-insight-reference-copy.png — insight paragraph referencing the limits, numbers only in gauges/strip
• tc-4-focus-ring.png — token focus ring (2px solid accent) on keyboard focus

Sibling PRs (same release lane)

• feat(shotload): shared shot-load state machine with a visible load chip #63 shared shot-load machine — merged
• feat(command palette): Ctrl/Cmd+K search over workspaces, shots, lessons, glossary #65 command palette — merged
• feat(drawer): anchored what-if becomes a right-side editor drawer over Replay #66 editor drawer — merged
• feat(compare): the Compare workspace absorbs the catalog #67 Compare absorbs the catalog — merged
• Release audit / capability-parity PR — TBD (not yet opened)

How to review

web/replay.js insight block (~line 585) and web/lessons.json 5.5 travel together — review as one change. The style.css diff is mostly deletions (corrupted tail); the reduced-motion block is additive. Guide-contract identifiers are intentionally unchanged.

Human author: Tapan Ganatma Nakkina ([email protected])

🔗 Obvious Project · 🧵 Obvious Thread · 🔀 Obvious PR Artifact

Test Evidence

V7a: guided lesson-1 walkthrough advances to lesson 2 with spotlight and task card

Limit redundancy: insight paragraph references gauges and limits strip instead of restating numbers

Focus ring: shared --focus-ring token (2px solid accent) on keyboard focus

V7b: Lab-mode ? panel help opens the mapped lesson (Equilibrium → lesson 4.1)