[dashboard-language] Security, privacy, accessibility: enforce custom-view context filtering

Milestone

Security, privacy, accessibility

Specification coverage

• DLS-SAFE-006
• DLS-CTX-003
• DLS-CTX-004
• DLS-CTX-008
• DLS-VIEW-013
• DLS-VIEW-014
• DLS-VIEW-015

What changed

• enforced custom-view narrowing context in pages/dashboard/src/presenter.js before rendering metric, table, and chart views
• added generic presenter-side filtering for declared scope, absolute time.start/time.end, and filters
• preserved explicit empty and unavailable rendering states after narrowing
• added unit and browser coverage proving out-of-scope and out-of-range observations and links are not rendered

Quality gates

Ran from pages/dashboard/:

• npm install ✅
• npm run typecheck ✅
• npm run lint ✅
• npm test ✅
• npx playwright test --config=playwright.config.mjs ✅

Blockers

• None in this run.

Next milestone

Security, privacy, accessibility — continue the remaining Section 13 accessibility/screen-reader or compliance-linked slices not yet covered in the checklist.

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