[dashboard-language] Security, privacy, accessibility: keyboard section navigation

Milestone

Security, privacy, accessibility

Shipped in this increment

• Added a narrow Section 13 presenter slice for DLS-SAFE-007 and DLS-SAFE-008.
• Grouped built-in runs, findings, and evals content into reusable focusable page-section regions with stable accessible headings.
• Added enableDashboardKeyboardNavigation() in pages/dashboard/src/presenter.js for deterministic ArrowUp / ArrowDown traversal between adjacent labeled sections.
• Added unit coverage in pages/dashboard/test/unit/presenter.test.js and browser coverage in pages/dashboard/test/e2e/smoke.spec.js for section labels, focusability, and keyboard traversal.
• Updated pages/dashboard/PLAN.md to record the completed slice and next step.

Specification coverage

• Section 13
• DLS-SAFE-007
• DLS-SAFE-008

Quality gates

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

Blockers

• None in this increment.

Next milestone

Security, privacy, accessibility — next slice for privacy/redaction semantics or additional screen-reader-oriented presenter behavior.

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