[dashboard-components] Extract titled region view chrome

Summary

• Extracted reusable built-in titled-region composition into pages/dashboard/src/components/view-chrome.js.
• Replaced repeated heading-plus-content construction in pages/dashboard/src/presenter.js without changing rendered behavior.
• Updated the component inventory and run log in pages/dashboard/PLAN.md.

Duplication evidence

Repeated h('h3', ...) plus a single summary/list/table content block remained in pages/dashboard/src/presenter.js at these call sites before the refactor:

• renderBuiltInPage() provenance heading + renderProvenanceList()
• renderWorkflowsPage() workflow inventory heading + table region
• renderUsagePage() usage totals heading + summary list; usage observations heading + table region
• renderEnginesModelsPage() inventory heading + table region
• renderOperationalValuePage() timeline heading + table region
• renderOrganizationsPage() inventory heading + table region
• renderRepositoriesPage() inventory heading + table region
• renderExperimentsPage() section heading + note + table region
• renderGradersPage() definitions heading + table region; observations heading + table region

Extraction

• Added renderTitledRegion(pageId, title, content) to wrap a single content node with the shared focusable labeled page-section markup.
• Added renderProvenanceSection(pageId, items) to reuse the same titled-region wrapper for built-in provenance.

Call sites collapsed

• pages/dashboard/src/presenter.js
  • built-in provenance section
  • workflows inventory section
  • usage totals section
  • usage observations section
  • engines/models inventory section
  • operational value timeline section
  • organizations inventory section
  • repositories inventory/rankings section
  • experiments definitions/associations section
  • graders definitions section
  • graders observations section

Tests added/updated

• pages/dashboard/test/unit/view-chrome.test.js
  • added titled-region composition coverage
  • added provenance-section coverage including empty fallback

Behavior preservation evidence

• Full test suite unchanged and passing.
• Compared the affected presenter output structurally via the refactor diff captured at /tmp/gh-aw/agent/presenter-refactor.diff; changes are limited to replacing repeated heading-plus-content assembly with renderTitledRegion(...) / renderProvenanceSection(...) while preserving DOM text, headings, class names, and accessible labeling.

Quality gates

Ran from pages/dashboard/:

• npm install ✅
• npm run typecheck ✅
• npm run lint ✅
• npm test ✅
• npm run test:e2e ✅

Blockers

• None.

Next candidates

• Extract repeated built-in summary-section composition for count lists.
• Extract repeated custom-view context-list rendering.
• Extract the next shared pure helpers around subject/provenance/count formatting in pages/dashboard/src/presenter.js.

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