chore(mockups): document-navigation mockups with verification pass

[BigSimmo]

Overlaps #1311. That PR holds the same seven mockup routes at f833621; this branch is f833621 plus one commit finishing the verification pass that was still outstanding. Only one of these two should land — close whichever you prefer, or ask me to move the fix commit onto claude/navigation-pane-mockups-0600af and close this one.

Summary

• Seven design-scratch mockup routes exploring section navigation for the document viewer (Overview, High-yield summary, PDF preview, Pinned evidence, Indexed source text, Tables and diagrams, Indexing details): document-navigation-pane, document-phone-title, document-phone-title-refined, document-phone-fused-directions, document-phone-zero-chrome, document-navigation-contract, document-navigation-final.
• Regenerated docs/site-map.md, which was missing six of the seven new routes.
• Removed an unused useState import in document-phone-title-mockups.tsx that failed --max-warnings 0.
• Applied Prettier to five mockup files that were failing the pre-push format guard.

Mockups only — no production route, component, or behaviour is touched. src/app/mockups/** is design-scratch and exempt from the button-wiring and route-reachability gates by existing convention.

Verification

• npm run typecheck — clean
• npm run lint — clean (0 errors, 0 warnings)
• npm run format — clean
• npm run sitemap:update — regenerated, diff committed

UI verification not run: mockup-only routes with no production surface; no shared chrome, token, routing, or styling change to exercise.

Verification not run beyond the above: npm run verify:pr-local was not run in this session. Everything it would add for this diff (build, client-bundle scan, RAG fixture/manifest validation) is unreachable from mockup-only files.

Risk and rollout

• Risk: None to production. Additive routes under /mockups, plus a regenerated generated doc.
• Rollback: Revert the branch; no data, schema, or config is touched.
• Provider or production effects: None.

Notes

The design exploration is not finished. Two items are still open:

1. A document-navigation-final-review variant (a two-version comparison refining document-navigation-final) was built in an earlier session but never committed, and was lost when that container was reclaimed. It is not in this branch.
2. A follow-up request for a universal, config-driven navigation panel modelled on TherapyCompassNav is awaiting a direction decision.

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