feat(hub): wiki and mockups views in blueprints; document mockups

[tomasz-zajac-oss]

Summary

This PR adds wiki views and a mockups structure view to every blueprint, and documents mockups, screen flows and Radical Forge.

Blueprint views

• New views in every blueprint:
  • Mockups (structure view): every screen flow with its wireframes on one canvas.
  • Governance (wiki): requirements, fitness functions and ADRs.
  • Requirements (wiki): requirements only.
• Renamed view. The canvas governance view is now Governance map, so its name does not clash with the Governance wiki view after import.
• conceptViews handles wiki and table views. They are converted like canvas views, including their per-view settings (wikiFocusId, wikiPageMode, tableActiveTab). They now appear in the Hub viewer and are created on import.
• Hub viewer:
  • The view selector now works in Canvas, Wiki and Table mode. It lists the concept's views for the current mode, and "All elements" stays the default.
  • kindForViewId now looks up the loaded views to tell which mode a concept's view belongs to.
  • The /cv/<id> route parameter works in any mode, e.g. …/v/wiki/cv/view-wiki-requirements.

Documentation

• Manual (website/manual.html):
  • New section Mockups & screen flows: the element, its relations, wireframes (AI generation, sanitising) and screen flows, with light and dark screenshots (website/screenshots/mockups-*.png).
  • New section Radical Forge: the stages, including Mockups before C4, and "Finish here" with the summary step. Forge was not documented before.
  • Hub section: blueprint screen flows and named views per mode.
  • Deep links section: the /cv/ parameter.
• README: new feature bullets for UI mockups and Radical Forge; the Architecture Hub bullet mentions blueprint flows and views.
• CHANGELOG (Unreleased): mockups, the Forge changes, blueprint flows and views, and the fixes to Hub views and import toasts.

Type of change

• New feature
• Documentation
• Tests

Checklist

• npm test passes (408/408)
• npm run typecheck passes with no errors
• New or changed behaviour is covered by tests:
  • conceptViews keeps wiki views (focus remapped on import) and drops unsupported kinds
  • kindForViewId resolves the mode of a concept view
  • the /cv/ route parameter round-trips in any mode
  • every blueprint has the Mockups, Governance and Requirements views, and the Requirements wiki view contains exactly the blueprint's requirements
• Documentation updated (README, CHANGELOG, manual)

Test plan

• Checked in npm run dev:web with headless Chromium:
  • Hub, E-commerce blueprint:
    • Canvas → Mockups shows 14 screens in 2 flows and no containers.
    • The Wiki selector lists All elements / Governance / Requirements; the table of contents shrinks from 46 entries to 10 and 5.
  • Deep link: bp-fintech-ledger-platform/v/wiki/cv/view-wiki-requirements opens straight into that wiki view.
  • Studio import: creates the "Governance [wiki]" and "Requirements [wiki]" views next to the canvas views.
  • No console errors.
• Rendered the manual locally. The new sections, table-of-contents entries and screenshots display correctly.

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