[dashboard-language] Refactor dashboard view chrome helpers

Milestone

Built-in pages / Security, privacy, accessibility support refactor: reusable view chrome component extraction.

What shipped

Added pages/dashboard/src/components/view-chrome.js as a presentation-only helper module for:
- focusable labeled page-section wrappers,
- custom-view source/metadata header chrome,
- built-in provenance list rendering.
Updated pages/dashboard/src/presenter.js to reuse those helpers instead of repeating equivalent DOM construction.
Added pages/dashboard/test/unit/view-chrome.test.js for deterministic section labeling, provenance rendering, and source/metadata chrome output.
Updated pages/dashboard/test/e2e/smoke.spec.js data-URL module wiring so browser coverage still exercises the presenter with the extracted component.
Updated pages/dashboard/PLAN.md component inventory and run log.

Specification coverage

This run preserves and re-verifies previously implemented behavior for:

DLS-PAGE-014
DLS-VIEW-013
DLS-SAFE-007
DLS-SAFE-008
DLS-SAFE-010

No new specification semantics were invented; this is a presenter/component refactor that keeps the supported slice behaviorally identical while increasing reuse.

Quality gates

Ran from pages/dashboard/:

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

Blockers

None in this run.

Next milestone

Continue bounded presenter refactors under the existing Built-in pages / Security work, with likely next slices around repeated built-in summary-section composition or parity inventory once the presenter surface stabilizes.

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